Both players get the same random number! ّI want each player to get a different number since they are throwing dice. here is the code:
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
int roll_a_dice(void);
int main(int argc, const char *argv[])
{
int flag;
int answer1 = roll_a_dice();
int answer2 = roll_a_dice();
printf("Die 1 (rolled by player 1): %d\n", answer1);
printf("Die 2 (rolled by player 2): %d\n", answer2);
if (answer1>answer2) {
printf("Player 1 is starting!\n");
flag = 1;
} else {
printf("Player 2 is starting!\n");
flag = 2;
}
printf("Goodbye!\n");
return 0;
}
int roll_a_dice(void)
{
int r;
srand(time(NULL));
r = 1 + rand() % 6;
return r;
}
The players are throwing dice. So number has to be 1-6. How can I fix this?
srand ( time(NULL) );
is used to seed the pseudo-random number generator. time()
having a granularity of 1 second, if you seed the PNRG every time you call the roll_a_dice()
function, for all the calls made within the granularity period, rand()
will end up returning the same random number.
Move the srand ( time(NULL) );
out of the roll_a_dice()
function, call that only once in main()
.
You only need to seed once. Move srand to the top of main and it will work.
srand( int );
is used to initialize a seed.
From there each time you call rand()
you'll
get a new random value. By calling srand()
in roll_a_dice()
you keep reseting the seed every time. Just move srand()
at the start of your main().
来源:https://stackoverflow.com/questions/36558716/how-can-i-generate-different-random-numbers-for-each-player