Find a sum of 2D array, array must be generated by F. rand. why this code doesn't work ?

Question

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
srand(time(NULL));
int A[4][3], B[4][3], C[4][3];
int num;
for(int i=0; i < 4; i++){
for(int j=0; j<3; j++)
num = rand() % (100 - 1 + 1);
A[i][j] = num;
A[i][j] = num;
}
for(int i=0; i < 4; i++){
for(int j=0; j<3; j++)
printf("%d\t", A[i][j]);
}
for(int i=0; i < 4; i++){
for(int j=0; j<3; j++)
printf("%d\t", B[i][j]);
}
//compute C[4][3]
for(int i=0; i < num; i++){
for(int j=0; j<num; j++)
C[i][j] = A[i][j] + B[i][j];
}
printf("C is \n");
for(int i=0; i < 4; i++){
for(int j=0; j<3; j++)
printf("%d\t", C[i][j]);
}
return 0;
}

Answer 1

Each for loop with „ j “ do no have the {} brackets.

Answer 2

You are filling array <A> twice in the first nested loop.
There are more so I just edit the code.
Edited code:
https://code.sololearn.com/ccT1l3OB1lHO/?ref=app