why the output not showing

Question

#include<stdio.h>
int main()
{
    int i,j;
    int sum=0;
    int a[3][3];
    
    for(i = 0; i < 3; i++)
    {
        for(j = 0; j < 3; j++)
        {
            scanf("%d", & a[i][j]);
        }
    }
    for(i = 0; i < 3;i++)
    {
        for(j = 0; j < 3;j++ )
        {
            if(i==j)
            {
                sum = sum + a[i][j];
            }
        }
    }
    printf("Sum of Digonal matrix element is %d",sum);
    
    return 0;
}

Answer 1

You first need to enter 9 numbers, then the program shows the result. It seems to work correctly for me.