C program to print half diamond star pattern 
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C Programming Language / Loop control in C Language

3367

Program:

/**
 * C program to print half diamond star pattern series.
* atnyla.com
 */

#include<stdio.h>

int main()
{
    int i, j, N, columns;

    /* Input number of columns from user */
    printf("Enter number of columns:");
    scanf("%d",&N);

    columns=1;

    for(i=1;i  < N*2;i++)
    {
        for(j=1; j <= columns; j++)
        {
            printf("*");
        }

        if(i  <  N)
        {
            /* Increment number of columns per row for upper part */
            columns++;
        }
        else
        {
            /* Decrement number of columns per row for lower part */
            columns--;
        }

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

    return 0;
}

Output:

Enter number of columns: 5
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Explanation:

Required knowledge

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

Read more - Program to print mirrored half diamond star pattern

Logic to print half diamond star pattern

 

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The above pattern consist of N * 2 - 1rows. For each row columns are in increasing order till Nth row. After Nth row columns are printed in descending order.

Step by step descriptive logic to print half diamond star pattern.

  1. Input number of columns to print from user. Store it in a variable say N.
  2. Declare a variable as loop counter for each column, say columns = 1.
  3. To iterate through rows, run an outer loop from 1 to N * 2 - 1. The loop structure should look like for(i=1; i.
  4. To iterate through columns, run an inner loop from 1 to columns. The loop structure should look like for(j=1; j<=columns; j++). Inside this loop print star.
  5. After printing all columns of a row, move to next line.
  6. After inner loop check if(i <= N) then increment columns otherwise decrement by 1.

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