C Program to display half-pyramid using numbers

Problem

Write a program in C to print  half-pyramid using numbers as shown.The program should take the number of rows as input.

1
1 2
1 2 3
1 2 3 4

How to create and display half-pyramid pattern in C using numbers?

#include <stdio.h>
int main()
{
    int index1, index2, n;
    printf("Abundantcode.com Coding samples\n");
    printf("Enter the No. of rows:");
    scanf("%d",&n);

    for(index1=1; index1<=n; ++index1)
    {
        for(index2=1; index2<=index1; ++index2)
        {
            printf("%d ",index2);
        }
        printf("\n");
    }
    return 0;
}

Output

Abundantcode.com Coding samples

Enter the No. of rows:4

1

1 2

1 2 3

1 2 3 4