Untitled

How to use array of pointers?
#include<stdlib.h>
#include<conio.h>
int main(void)
{
    int rows=5,cols = 5;
    int *a[100];
    int i = 0;
    int j;
    int k = 0;
    int b[100];
    while(i<rows)
    {
        printf("nEnter the %d row: ",i);
        for(j=0;j<cols;j++)
            scanf("%d",&b[j]);

        a[k++] = b;
        i = i + 1;
    }
    k = k-1;
    for(i=0;i<=k;i++){
        for(j=0;j<cols;j++){
            printf("%d  ",a[i][j]);
        }
    }

    getch();
    return 0;
}

a[k++] = b;

// int b[100]; // Delete this!
while(i<rows)
{
    int *b = calloc(cols, sizeof(int)); // Replacement for int b[100]
    printf("nEnter the %d row: ",i);
    for(j=0;j<cols;j++)
        scanf("%d",&b[j]);

    a[k++] = b; // Now it's safe to do this, because `b` is a different array each time
    i = i + 1;
}

int rows = 5, cols = 5;
int** a;
int i;

a = malloc(rows * sizeof(*a));
for(i = 0; i < rows; i++)
    a[i] = malloc(cols * sizeof(**a));