rand() returns the same value after the first time

Question

First, here\'s my code:

#include 
#include 
#include 
#include 

#define NUM_SUITS 4
#define NUM_R         


        

Answer 1

scanf("%d", &newcard); and scanf("%d", &stay); are a problem as the variables are bool, but the format specifier is for int. In 2 places, change like:

// scanf("%d", &newcard);
int t;
scanf("%d", &t);
newcard = !!t;

3 functions return int but do not return anything. Change to void functions.

// int main_hand() {
void main_hand() {    

There appears to be other logic issues too.
1) Code sometimes exists without knowing if won/loss
2) @Jongware comment above correct:

Lastly: If the same random sequence is still coming up, strip code to a bare main srand time printf rand and see if that works. time(), if not working always returns -1.
Or simple add the following and verify srand() called with different values.

 int main(void) {
   unsigned now = (unsigned) time(NULL);
   printf("now = %u\n", now);
   srand(now);