Matrix

#include<stdio.h>

int Id(int num)
{
    int row, col;

    for (row = 0; row < num; row++)
    {
        for (col = 0; col < num; col++)
        {
            if (row == col)
                printf("%d ", 1);
            else
                printf("%d ", 0);
        }
        printf("\n");
    }
    return 0;
}

int main()
{
    int size;
    printf("Enter the size: ");
    scanf("%d",&size);
    Id(size);
    return 0;
}