C Program to display inverted full pyramid using *

Problem

Write a program in C to print inverted full pyramid using * as shown below.The program should take the number of rows as input.

* * * * * * * 
   * * * * *
      * * *
        *

How to create and display inverted full pyramid using * ?

#include<stdio.h>
int main()
{
    int input, index1, index2, space;
    printf("Abundantcode.com Coding samples\n");
    printf("Enter number of rows: ");
    scanf("%d",&input);

    for(index1=input; index1>=1; --index1)
    {
        for(space=0; space < input-index1; ++space)
            printf("  ");
        for(index2=index1; index2 <= 2*index1-1; ++index2)
            printf("* ");
        for(index2=0; index2 < index1-1; ++index2)
            printf("* ");
        printf("\n");
    }
    return 0;
}

Output

Abundantcode.com Coding samples

Enter number of rows: 4

* * * * * * * 
  * * * * *    
    * * *        
      *

%d