PROBLEM 18:

Write a C Program that prompts the user for a positive integer as input, printing the respective hollow triangle

CODE:

#include <stdio.h>

int main()

{

    int i, j, n;

    //Reads number of rows to be printed from user

    printf("Enter value of n : ");

    scanf("%d", &n);

    for(i=1; i<=n; i++)

    {

        //Prints trailing spaces

        for(j=i; j<n; j++)

        {

            printf(" ");

        }

        //Prints hollow pyramid

        for(j=1; j<=(2*i-1); j++)

        {

            if(i==n || j==1 || j==(2*i-1))

            {

                printf("*");

            }

            else

            {

                printf(" ");

            }

        }

        printf("\n");

    }

    return 0;

}

Program Output:

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