Thread: Blackjack code.

Hello. So I set to write a simple Blackjack program, and what I have done so far (not the whole code) works fine except that the rand() function keeps giving out the same values over and over. So it's not really random, and I don't know what I'm doing wrong. Will you take a look at it?

Code:

#include<stdio.h>

int main(void){
    int n,i,k,cont;
    char card;
    
    for(n=0;n<20;n++){
                      cont=0;
                      printf("#####################################\n");
                      printf("             BLACKJACK\n\n");
                      
                      do{
                         printf("Nova carta?\n");
                         scanf("%c",&card);
                         
                         if(card == 's'){
                              cont+=rand()%12;
                              if(cont>21){
                                          printf("%d",cont);
                                          printf("Temos pena mas perdeu!!\n");}
                                          
                              if(cont==21){
                                           printf("BLACKJACK!!!");}
                                           
                              else{
                                   printf("%d\n",cont);}
                                          }
                              }while(card!='n' && cont < 22);
                              
                      system("pause");
                      system("cls");
                      }
    return 0;
}

Try putting ...

Code:

#include <time.h>

at the top of the file
then add

Code:

srand(time(NULL));

above your for loop....

Originally Posted by quzah

There is a FAQ on random numbers. You should read it. Seed rand once at the very beginning of your program, and you should be fine.


Quzah.

Thanks! That helped a lot. I thought I just needed to plug in the rand() function and the whole thing would just work. Thanks for addressing me to the FAQ.

Originally Posted by CommonTater

Try putting ...

Code:

#include <time.h>

at the top of the file
then add

Code:

srand(time(NULL));

above your for loop....

Thanks. That works indeed.