holloway@drivax.UUCP (Bruce Holloway) (03/07/86)
I recently posted a version of a Battleship game for CP/M-68K. I really
meant to post the source for the Unix w/curses version. Here it is now.
/*----------cut here---------- ----------and here---------- */
#include "stdio.h"
#include "curses.h"
#include "signal.h"
#define OTHER 1-turn
char numbers[] = " 0 1 2 3 4 5 6 7 8 9";
char carrier[] = "Aircraft Carrier";
char battle[] = "Battleship";
char sub[] = "Submarine";
char destroy[] = "Destroyer";
char ptboat[] = "PT Boat";
char name[] = "Bruce";
struct _ships {
char *name;
char symbol;
char length;
char start; /* Coordinates - 0,0=0; 10,10=100. */
char dir; /* Direction - 0 = right; 1 = down. */
char hits; /* How many times has this ship been hit? (-1==sunk) */
};
struct _ships plyship[] = {
{ carrier,'A',5,0,0,0 },
{ battle,'B',4,0,0,0 },
{ destroy,'D',3,0,0,0 },
{ sub,'S',3,0,0,0 },
{ ptboat,'P',2,0,0,0 },
};
struct _ships cpuship[] = {
{ carrier,'A',5,0,0,0 },
{ battle,'B',4,0,0,0 },
{ destroy,'D',3,0,0,0 },
{ sub,'S',3,0,0,0 },
{ ptboat,'P',2,0,0,0 },
};
char hits[2][100], board[2][100]; /* "Hits" board, and main board. */
int srchstep;
int cpuhits;
int cstart, cdir;
int plywon=0, cpuwon=0; /* How many games has each won? */
int turn; /* 0=player, 1=computer */
main(){
intro();
do{
initgame();
while(awinna() == -1){
while((turn) ? cputurn() : plyturn());
turn = OTHER;
}
} while(playagain());
uninitgame();
}
#define PR addstr
intro(){
int uninitgame();
signal(SIGINT,uninitgame);
if(signal(SIGQUIT,SIG_IGN) != SIG_IGN) signal(SIGQUIT,uninitgame);
initscr();
saveterm();
nonl(); cbreak(); noecho();
clear();
mvaddstr(4,29,"Welcome to Battleship!");
move(8,0);
PR(" \\\n");
PR(" \\ \\ \\\n");
PR(" \\ \\ \\ \\ \\_____________\n");
PR(" \\ \\ \\_____________ \\ \\/ |\n");
PR(" \\ \\/ \\ \\/ |\n");
PR(" \\/ \\_____/ |__\n");
PR(" ________________/ |\n");
PR(" \\ S.S. Penguin |\n");
PR(" \\ /\n");
PR(" \\___________________________________________________/\n");
mvaddstr(20,27,"Hit any key to continue..."); refresh();
getch();
}
initgame(){
int i;
clear();
mvaddstr(0,35,"BATTLESHIP");
mvaddstr(4,12,"Main Board");
mvaddstr(6,0,numbers);
move(7,0);
for(i=0; i<10; ++i){
printw("%c . . . . . . . . . . %c\n",i+'A',i+'A');
}
mvaddstr(17,0,numbers);
mvaddstr(4,55,"Hit/Miss Board");
mvaddstr(6,45,numbers);
for(i=0; i<10; ++i){
mvprintw(7+i,45,"%c . . . . . . . . . . %c",i+'A',i+'A');
}
mvaddstr(17,45,numbers);
for(turn=0; turn<2; ++turn)
for(i=0; i<100; ++i){
hits[turn][i] = board[turn][i] = 0;
}
for(turn=0; turn<2; ++turn){
for(i=0; i<5; ++i)
if(!turn) plyplace(&plyship[i]);
else cpuplace(&cpuship[i]);
}
turn = rnd(2);
cstart = cdir = -1;
cpuhits = 0;
srchstep = 3;
}
rnd(n)
int n;
{
return(((rand() & 0x7FFF) % n));
}
plyplace(ss)
struct _ships *ss;
{
int c, d;
do{
prompt();
printw("Place your %s (ex.%c%d) ? ",ss->name,rnd(10)+'A',rnd(10));
c = getcoord();
d = getdir();
} while(!checkplace(ss,c,d));
placeship(ss,c,d);
}
getdir(){
int d;
prompt(); addstr("What direction (0=right, 1=down) ? ");
return(sgetc("01")-'0');
}
placeship(ss,c,d)
struct _ships *ss;
int c, d;
{
int x, y, l, i;
for(l=0; l<ss->length; ++l){
i = c + l * ((d) ? 10 : 1);
board[turn][i] = ss->symbol;
x = (i % 10) * 3 + 3;
y = (i / 10) + 7;
if(!turn) mvaddch(y,x,ss->symbol);
}
ss->start = c;
ss->dir = d;
ss->hits = 0;
}
checkplace(ss,c,d)
struct _ships *ss;
int c, d;
{
int x, y, l;
x = c%10; y = c/10;
if(((x+ss->length) > 10 && !d) || ((y+ss->length) > 10 && d==1)){
if(!turn)
switch(rnd(3)){
case 0:
error("Ship is hanging from the edge of the world");
break;
case 1:
error("Try fitting it on the board");
break;
case 2:
error("Figure I won't find it if you put it there?");
break;
}
return(0);
}
for(l=0; l<ss->length; ++l){
x = c + l * ((d) ? 10 : 1);
if(board[turn][x]){
if(!turn)
switch(rnd(3)){
case 0:
error("There's already a ship there");
break;
case 1:
error("Collision alert! Aaaaaagh!");
break;
case 2:
error("Er, Admiral, what about the other ship?");
break;
}
return(0);
}
}
return(1);
}
error(s)
char *s;
{
prompt(); beep();
printw("%s -- hit any key to continue --",s);
refresh();
getch();
}
prompt(){
move(22,0); clrtoeol();
}
toupper(ch)
int ch;
{
return((ch >= 'a' && ch <= 'z') ? ch-'a'+'A' : ch);
}
getcoord(){
int ch, x, y, oldx, oldy;
redo:
y = sgetc("ABCDEFGHIJ");
do{
ch = getch();
if(ch == 0x7F || ch == 8){
mvcur(&oldy,&oldx,0,0);
mvaddch(oldy,oldx-1,' ');
move(oldy,oldx-1); refresh();
goto redo;
}
} while(ch < '0' || ch > '9');
addch(x=ch); refresh();
return((y-'A')*10+x-'0');
}
cpuplace(ss)
struct _ships *ss;
{
int c, d;
do{
c = rnd(100); d = rnd(2);
} while(!checkplace(ss,c,d));
placeship(ss,c,d);
}
awinna(){
int i, j;
struct _ships *ss;
for(i=0; i<2; ++i){
ss = (i) ? cpuship : plyship;
for(j=0; j<5; ++j, ++ss)
if(ss->length != ss->hits)
break;
if(j == 5) return(OTHER);
}
return(-1);
}
plyturn(){
int c, res, i;
char *m;
prompt();
addstr("Where do you want to shoot? ");
c = getcoord();
if(!(res = hits[turn][c])){
hits[turn][c] = res = (board[OTHER][c]) ? 'H' : 'M';
mvaddch(7+c/10,48+3*(c%10),(res=='H') ? 'H' : 'o');
if(c = hitship(c)){
prompt();
switch(rnd(3)){
case 0:
m = "You sank my %s!";
break;
case 1:
m = "I have this sinking feeling about my %s....";
break;
case 2:
m = "Have some mercy for my %s!";
break;
}
beep(); mvprintw(23,0,m,cpuship[c-1].name); refresh();
return(awinna() == -1);
}
}
prompt();
move(23,0); clrtoeol();
printw("You %s.",(res=='M')?"missed":"scored a hit"); refresh();
return(res == 'H');
}
hitship(c)
int c;
{
struct _ships *ss;
int sym, i, j;
ss = (turn) ? plyship : cpuship;
if(!(sym = board[OTHER][c])) return(0);
for(i=0; i<5; ++i, ++ss)
if(ss->symbol == sym){
j = ss->hits; ++j; ss->hits = j;
if(j == ss->length) return(i+1);
return(0);
}
}
cputurn(){
int c, res, x, y, i, d;
redo:
if(cstart == -1){
if(cpuhits){
for(i=0, c=rnd(100); i<100; ++i, c = (c+1) % 100)
if(hits[turn][c] == 'H')
break;
if(i != 100){
cstart = c;
cdir = -1;
goto fndir;
}
}
do{
i = 0;
do{
while(hits[turn][c=rnd(100)]);
x = c % 10; y = c / 10;
if(++i == 1000) break;
} while((x % srchstep) != (y % srchstep));
if(i == 1000) --srchstep;
} while(i == 1000);
}
else if(cdir == -1){
fndir: for(i=0, d=rnd(4); i++ < 4; d = (d+1) % 4){
x = cstart%10; y = cstart/10;
switch(d){
case 0: ++x; break;
case 1: ++y; break;
case 2: --x; break;
case 3: --y; break;
}
if(x<0 || x>9 || y<0 || y>9) continue;
if(hits[turn][c=y*10+x]) continue;
cdir = -2;
break;
}
if(i == 4){
cstart = -1;
goto redo;
}
}
else{
x = cstart%10; y = cstart/10;
switch(cdir){
case 0: ++x; break;
case 1: ++y; break;
case 2: --x; break;
case 3: --y; break;
}
if(x<0 || x>9 || y<0 || y>9 || hits[turn][y*10+x]){
cdir = (cdir+2) % 4;
for(;;){
switch(cdir){
case 0: ++x; break;
case 1: ++y; break;
case 2: --x; break;
case 3: --y; break;
}
if(x<0 || x>9 || y<0 || y>9){ cstart = -1; goto redo; }
if(!hits[turn][y*10+x]) break;
}
}
c = y*10 + x;
}
for(;;){
prompt();
printw("I shoot at %c%d. Do I (H)it or (M)iss? ",c/10+'A',c%10);
res = sgetc("HM");
if((res=='H' && !board[OTHER][c]) || (res=='M' && board[OTHER][c])){
error("You lie!");
continue;
}
break;
}
addch(res);
hits[turn][c] = res;
if(res == 'H'){
++cpuhits;
if(cstart == -1) cdir = -1;
cstart = c;
if(cdir == -2) cdir = d;
mvaddch(7+(c/10),3+3*(c%10),'*');
}
else if(cdir == -2) cdir = -1;
if(c=hitship(c)){
cstart = -1;
cpuhits -= plyship[c-1].length;
x = plyship[c-1].start;
d = plyship[c-1].dir;
y = plyship[c-1].length;
for(i=0; i<y; ++i){
hits[turn][x] = '*';
x += (d) ? 10 : 1;
}
}
if(awinna() != -1) return(0);
return(res == 'H');
}
playagain(){
int i, x, y, dx, dy, j;
for(i=0; i<5; ++i){
x = cpuship[i].start; y = x/10+7; x = (x % 10) * 3 + 48;
dx = (cpuship[i].dir) ? 0 : 3;
dy = (cpuship[i].dir) ? 1 : 0;
for(j=0; j < cpuship[i].length; ++j){
mvaddch(y,x,cpuship[i].symbol);
x += dx; y += dy;
}
}
if(awinna()) ++cpuwon; else ++plywon;
i = 18 + (sizeof name);
if(plywon >= 10) ++i;
if(cpuwon >= 10) ++i;
mvprintw(2,(80-i)/2,"%s: %d Computer: %d",name,plywon,cpuwon);
prompt();
printw((awinna()) ? "Want to be humiliated again, %s? "
: "Going to give me a chance for revenge, %s? ",name);
return(sgetc("YN") == 'Y');
}
uninitgame(){
refresh();
resetterm(); echo(); endwin();
exit(0);
}
sgetc(s)
char *s;
{
char *s1;
int ch;
refresh();
for(;;){
ch = toupper(getch());
if(ch == 3) uninitgame();
for(s1=s; *s1 && ch != *s1; ++s1);
if(*s1){
addch(ch); refresh();
return(ch);
}
}
}
--
+----------------------------------------------------------------------------+
|Whatever I write are not the opinions or policies of Digital Research, Inc.,|
|and probably won't be in the foreseeable future. |
+----------------------------------------------------------------------------+
Bruce Holloway
....!ucbvax!hplabs!amdahl!drivax!holloway
(I'm not THAT Bruce Holloway, I'm the other one.)cagordon@watnot.UUCP (Chris Gordon) (03/09/86)
Using the following compile command, I got the following undefines below: cc -O -o bs bs.c -lcurses -ltermcap Undefined: _saveterm _cbreak _beep _resetterm Can someone (probably the original poster) help?
jrg@hpda.UUCP (Jeff Glasson) (03/10/86)
In article <11587@watnot.UUCP> cagordon@watnot.UUCP (Chris Gordon) writes: >Using the following compile command, I got the following undefines below: >cc -O -o bs bs.c -lcurses -ltermcap >Undefined: >_saveterm >_cbreak >_beep >_resetterm > >Can someone (probably the original poster) help? The undefined routines you see are from the AT&T version of curses. BSD curses does not have those routines. Here's a brief description of the routines (maybe someone out there has BSD versions): saveterm: save current modes as "in curses" state. cbreak: set cbreak mode beep: ring the terminal's bell resetterm: set tty modes to "out of curses" state Hope this helps, Jeff Glasson Hewlett-Packard ISO ucbvax!hpda!jrg
thomas@utah-gr.UUCP (Spencer W. Thomas) (03/10/86)
In article <11587@watnot.UUCP> cagordon@watnot.UUCP (Chris Gordon) writes: >cc -O -o bs bs.c -lcurses -ltermcap >Undefined: >_saveterm >_cbreak >_beep >_resetterm saveterm and resetterm are called savetty and resetty under BSD. cbreak is presumably crmode(). beep() { write( 1, "\007", 1 ); } -- =Spencer ({ihnp4,decvax}!utah-cs!thomas, thomas@utah-cs.ARPA)
stevo@ucrmath.UUCP (Steve Groom) (03/11/86)
> Using the following compile command, I got the following undefines below: > cc -O -o bs bs.c -lcurses -ltermcap > Undefined: > _saveterm > _cbreak > _beep > _resetterm > > Can someone (probably the original poster) help? I got similar messages on our 4.2bsd system. I fixed them by making the following substitutions to the source (hints found by doing "man curses") : savetty() for saveterm() crmode() for cbreak() resetty() for resetterm() To fix beep(), I simply added a dummy procedure at the end of the program that looked like this (hey, I know its a hack, but it works!) : beep(){ } If I decided I *liked* having the terminal make noises at me, I would simply add the code to beep() to make it send a ^G to the screen .... probably something like: wprintw(stdscr,"%c",7); (No warrantys given or implied about the above noisemaking fragment) Steve Groom Univ. of Calif., Riverside {ucla-cs, ucbvax!ucdavis} !ucrmath!stevo /* "waddaya want for nothin' ?!" */
holloway@drivax.UUCP (Bruce Holloway) (03/11/86)
In article <11587@watnot.UUCP> cagordon@watnot.UUCP (Chris Gordon) writes: >Using the following compile command, I got the following undefines below: >cc -O -o bs bs.c -lcurses -ltermcap >Undefined: >_saveterm >_cbreak >_beep >_resetterm > >Can someone (probably the original poster) help? All four of those functions are in both CURSES and MINICURSES here on our System V implementation. According to the CURSES documentation, they are standard functions which are used by "most interactive, screen-oriented programs". So you must have a different version of curses than we do. Here's how I compile it: cc -o battle battle.c -lcurses Which works fine. -- +----------------------------------------------------------------------------+ |Whatever I write are not the opinions or policies of Digital Research, Inc.,| |and probably won't be in the foreseeable future. | +----------------------------------------------------------------------------+ Bruce Holloway ....!ucbvax!hplabs!amdahl!drivax!holloway (I'm not THAT Bruce Holloway, I'm the other one.)
sma8465@ritcv.UUCP () (03/11/86)
In article <11587@watnot.UUCP> cagordon@watnot.UUCP (Chris Gordon) writes: >Using the following compile command, I got the following undefines below: >cc -O -o bs bs.c -lcurses -ltermcap >Undefined: >_saveterm >_cbreak >_beep >_resetterm > >Can someone (probably the original poster) help? Well, I'm not the original poster, but I can help. First, use -ltermlib instead of -ltermcap. This will clear up all errors except for _beep (at least it did for me). You just have to write your own beep function which prints out a ctrl-G to the terminal. ex: beep() { printf("%c",7); /* beep! */ } I worked with the curses version and beep was the only thing that didn't work. I hope your's works ok. Steve Abbott (c) Mad Wabbit Software, Inc. Webster, New York 14580
cagordon@watnot.UUCP (Chris Gordon) (03/12/86)
In article <1358@hpda.UUCP> jrg@hpda.UUCP (Jeff Glasson) writes: >In article <11587@watnot.UUCP> cagordon@watnot.UUCP (Chris Gordon) writes: >>Using the following compile command, I got the following undefines below: >>cc -O -o bs bs.c -lcurses -ltermcap >>Undefined: >>_saveterm >>_cbreak >>_beep >>_resetterm >> >>Can someone (probably the original poster) help? > >The undefined routines you see are from the AT&T version of curses. >BSD curses does not have those routines. > >Here's a brief description of the routines (maybe someone out there has >BSD versions): > >saveterm: save current modes as "in curses" state. >cbreak: set cbreak mode >beep: ring the terminal's bell >resetterm: set tty modes to "out of curses" state > >Hope this helps, > >Jeff Glasson >Hewlett-Packard ISO >ucbvax!hpda!jrg Someone sent me the BSD versions of these commands. I just #define'd them as so: #define saveterm savetty #define cbreak crmode #define beep() putchar('\7') /* no equivalent */ #define resetterm resetty and all went well... ------------------------------------------------------------------------------- |Chris Gordon University of Waterloo | |watmath!watnot!cagordon | |CSNET:cagordon%watnot@Waterloo.CSNet | | | | "Welcome to the real world. There's so much to learn" | | Mr. Mister | -------------------------------------------------------------------------------
srt@ucla-cs.UUCP (03/12/86)
In article <11587@watnot.UUCP> cagordon@watnot.UUCP (Chris Gordon) writes: >Using the following compile command, I got the following undefines below: >cc -O -o bs bs.c -lcurses -ltermcap >Undefined: >_saveterm >_cbreak >_beep >_resetterm In the source code, replace: saveterm() --> savetty() cbreak() --> crmode() resetterm() --> resetty() I don't know about "beep"...? Scott R. Turner ARPA: (now) srt@UCLA-LOCUS.ARPA (soon) srt@LOCUS.UCLA.EDU UUCP: ...!{cepu,ihnp4,trwspp,ucbvax}!ucla-cs!srt FISHNET: ...!{flounder,crappie,flipper}!srt@fishnet-relay.arpa
campbell@maynard.UUCP (Larry Campbell) (03/14/86)
Please take this discussion to net.sources.d.
--
Larry Campbell The Boston Software Works, Inc.
ARPA: maynard.UUCP:campbell@harvard.ARPA 120 Fulton Street
UUCP: {harvard,cbosgd}!wjh12!maynard!campbell Boston MA 02109karen@wjvax.UUCP (Karen Pline) (03/18/86)
[munch munch.....] Regarding the Battleship Source posted to the net by Bruce: We solved the problem with curses on BSD 4.2 by adding four short routines to the bottom of the program - fairly simple. Also, whenever you play the game, it thinks you're Bruce (I took care of that, too). My problem, however, is with the pattern that the ships are set up in. The first time you play the game (every time you play it) the pattern that the ships are in is identical. If you stay in the game when the computer asks if you want to play again, a new pattern will be set up. But every time you restart the game, the same patterns repeat. So, once you play through the patterns without getting out of the program, you know the patterns for the next time you play (I hope this makes sense). There may be something wrong with the random pattern generator in the program (if there is one), but I haven't had time to look. If someone looks into this, please post to the net or let me know. Anyway, I've never posted to this group before, but I thought this was of general interest since so many people grabbed this piece of code. And since we're talking battleship games, we've had one on our system for a while which also came from the net (I think). I can't remember who posted it, but it also has a problem. When it searches for your ships, it always assumes you set yours up under the same strategy it sets its own ships up with - i.e., good possibility of adjacency. Then, it doesn't eliminate logically. By this I mean that even if it hits all the ships except the Carrier, it still looks for adjacencies or guesses randomly instead of just looking for openings where the five holes would fit. Needless to say, I've never lost (and believe me, I've played more than 100 times) even when I try to accomodate it a little bit. Karen Pline
greg@utcsri.UUCP (Gregory Smith) (03/21/86)
[Hey Line Eater....... eat a little line for me.....] This is in reply to a posting that complained that the recently posted battleships game always generated the same initial patterns for ships. The rand() function, by default, always generates the same 'quasi-random' sequence. This is a feature, not a bug; it is much easier to debug things when you can reproduce the same sequence over and over again. ( I am assuming the program uses rand(); I don't know for sure ). rand() has a buddy called srand(i) which 'spins the wheel' based on the int i, so that different random sequences can be produced each time. Try: srand( (int) getpid()); This should be executed exactly once, and before any call to rand. getpid() returns a long int which is the current process id. I 'casted' the long to an int in the above fragment because the manual says that getpid returns a long and that srand needs an int. On my machine, a vax, this is redundant because they are both 32 bits, but it probably is required on many other machines. If this fix does not work, check that (1) you have srand and getpid available (2) srand wants an int. If (2) is wrong, change the cast ( i.e. the (int) ). If you do not have getpid, use something that returns a number based on the time, or something like that. If you don't have srand(), you're on your own :-) Hope this helps. -- "No eternal reward will forgive us now for wasting the dawn" -J. Morrison ---------------------------------------------------------------------- Greg Smith University of Toronto ..!decvax!utzoo!utcsri!greg
holloway@drivax.UUCP (Bruce Holloway) (03/21/86)
I've posted fixes to all those problems to the net. Every single one of those buggers. Here is that program again, the full, bug-free version that KNOWS who you are, randomizes correctly, allows you to change your mind on entering expressions, has three different #defines controlling type of play, and can be used on both BSD and System V. (Wait -- I'll post it Real Soon Now). -- +----------------------------------------------------------------------------+ |Whatever I write are not the opinions or policies of Digital Research, Inc.,| |and probably won't be in the foreseeable future. | +----------------------------------------------------------------------------+ Bruce Holloway ....!ucbvax!hplabs!amdahl!drivax!holloway (I'm not THAT Bruce Holloway, I'm the other one.)
mcewan@uiucdcs.CS.UIUC.EDU (03/22/86)
> My problem, however, is with the pattern that the ships are set up in. > The first time you play the game (every time you play it) the pattern that > the ships are in is identical. That's easy. Just insert a "srand(getpid());" somewhere in the beginning of the program, before the first "rand" call. Scott McEwan {ihnp4,pur-ee}!uiucdcs!mcewan "I'm sorry, sir. According to your identification you're not even born yet. Come back in 500 years."
davidk@dartvax.UUCP (David C. Kovar) (03/24/86)
>> My problem, however, is with the pattern that the ships are set up in. >> The first time you play the game (every time you play it) the pattern that >> the ships are in is identical. >That's easy. Just insert a "srand(getpid());" somewhere in the beginning >of the program, before the first "rand" call. That'll still have the same problem. getpid() will return the same pid each time the same user runs it, thus you would get the same seed for rand each time. Try srand(time()); instead. -- David C. Kovar USNET: {ihnp4|linus|decvax|cornell|astrovax}!dartvax!davidk%amber ARPA: davidk%amber%dartmouth@csnet-relay CSNET: davidk%amber@dartmouth " It's the policies of debugging, it's the Programmer's Blues ... Programmer's Blues ... "
greg@utcsri.UUCP (Gregory Smith) (03/26/86)
In article <4336@dartvax.UUCP> davidk@dartvax.UUCP (David C. Kovar) writes: >>> My problem, however, is with the pattern that the ships are set up in. >>> The first time you play the game (every time you play it) the pattern that >>> the ships are in is identical. >>That's easy. Just insert a "srand(getpid());" somewhere in the beginning >>of the program, before the first "rand" call. >That'll still have the same problem. getpid() will return the same pid >each time the same user runs it, thus you would get the same seed for >rand each time. Try srand(time()); instead. No it won't. Every time you run something, a new process ID is assigned, no matter what you are running. getpid is get-process-id, not get-user-id. If you do srand(getpid()) twice in the same execution, you will get the same pid each time of course. That's why I said in my earlier posting that this should be done _exactly_once_, i.e. if the user wants to play again, don't call srand again! by the way: srand( (int) getpid ()); /* srand wants an int and */ or srand( (int) time() ); /* time() and getpid() return longs */ -- "No eternal reward will forgive us now for wasting the dawn" -J. Morrison ---------------------------------------------------------------------- Greg Smith University of Toronto ..!decvax!utzoo!utcsri!greg
tainter@ihlpg.UUCP (Tainter) (03/27/86)
> That'll still have the same problem. getpid() will return the same pid > each time the same user runs it, thus you would get the same seed for > rand each time. Try srand(time()); instead. > David C. Kovar > USNET: {ihnp4|linus|decvax|cornell|astrovax}!dartvax!davidk%amber > ARPA: davidk%amber%dartmouth@csnet-relay > CSNET: davidk%amber@dartmouth It will?! Really? Hay guys did you all know that UNIX always gives the same process id to a program/user pair? Gosh, amazing. Seriously, IGNORE KOVAR'S ADVICE!! He was obviously thinking of getuid(). --j.a.tainter (Share and enjoy)/2 = Go stick your head in a pig.
mcewan@uiucdcs.CS.UIUC.EDU (03/27/86)
>>> My problem, however, is with the pattern that the ships are set up in. >>> The first time you play the game (every time you play it) the pattern that >>> the ships are in is identical. > >> That's easy. Just insert a "srand(getpid());" somewhere in the beginning >> of the program, before the first "rand" call. > > That'll still have the same problem. getpid() will return the same pid > each time the same user runs it, thus you would get the same seed for > rand each time. Try srand(time()); instead. Well, this may be true for you, in which case you have a very weird operating system, but around here different processes have different process IDs. Scott McEwan {ihnp4,pur-ee}!uiucdcs!mcewan Green s/m watchlizard seeks s/f/wl - object: companionship. Reply Box 23, Cynosure.
davidk@dartvax.UUCP (David C. Kovar) (03/31/86)
I meant srand(time()); not srand(getpid()); Sorry about that.
getpid() will obviously change each time you run it.
--
David C. Kovar
USNET: {ihnp4|linus|decvax|cornell|astrovax}!dartvax!davidk%amber
ARPA: davidk%amber%dartmouth@csnet-relay
CSNET: davidk%amber@dartmouth
" It's the policies of debugging, it's the Programmer's Blues ...
Programmer's Blues ... "