C program to print right triangle star pattern 
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C Programming Language / Loop control in C Language

4375

Program:

/*
 * C program to print right triangle star pattern series
* atnyla.com
 */

#include <stdio.h>

int main()
{
    int i, j, n;

    /* Input number of rows from user */
    printf("Enter value of n: ");
    scanf("%d", &n);

    for(i=1; i<=n; i++)
    {
        /* Print i number of stars */
        for(j=1; j<=i; j++)
        {
            printf("*");
        }

        /* Move to next line */
        printf("\n");
    }

    return 0;
}

Output:

Enter the value of n: 5
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Explanation:

Required knowledge

Basic C programming, If else, For loop, Nested loop

Logic to print right triangle star pattern

 

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If you look at the pattern carefully you will find that stars are in increasing order of rows (i.e. 1 star in the first row, followed by 2 stars in second and so on).

Step by step descriptive logic to print right triangle star pattern.

  1. Input number of rows to print from the user. Store it in a variable say N.
  2. To iterate through rows run an outer loop from 1 to N with loop structure for(i=1; i<=N; i++).
  3. To iterate through columns run an inner loop from 1 to i with loop structure for(j=1; j<=i; j++). Inside the inner loop print star.
  4. After printing all columns of a row move to next line i.e. print new line.

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