Setting matrices with rand() function

Question

Hi everyone!
I wrote a function that is supposed to assign values to each element of a matrix using the rand function, but when I set two matrices, their elements are always the same.
Can you please help?
---------------------------------
//language: C

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void set_matrix(int *M, int row, int col){
srand(time(0));
int i, j;
for(i = 0 ; i < row ; i++){
for(j = 0 ; j < col ; j++){
*(M+i*col+j) = rand() % 9 + 1;
}
}
}

void print_matrix(int *M, int row, int col){
int i, j;
for(i = 0 ; i < row ; i++){
for(j = 0 ; j < col ; j++){
printf("%d ", *(M+i*col+j));
}
printf("\n");
}
}

int main()
{
int A[2][3], B[2][3];

set_matrix(&A[0][0], 2, 3);
set_matrix(&B[0][0], 2, 3);

printf("A:\n\n");
print_matrix(&A[0][0], 2, 3);
printf("\nB:\n\n");
print_matrix(&B[0][0], 2, 3);
return 0;
}

Answer 1

Why did you pass zero to time?

Answer 2

Isn't that what I'm supposed to do?

Answer 3

It appears to want NULL.

Answer 4

I guess zero is standard procedure with srand (time ())