C program to print left arrow star pattern 
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C Programming Language / Loop control in C Language

1897

Program:

/**
 * C program to print left arrow star pattern
 */

#include <stdio.h>

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

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

    // Print upper part of the arrow
    for(i=1; i<n; i++)
    {
        // Print trailing (n-rownumber) spaces
        for(j=1; j<=(n-i); j++)
        {
            printf(" ");
        }

        // Print inverted right triangle
        for(j=i; j<=n; j++)
        {
            printf("*");
        }

        printf("\n");
    }

    // Print bottom part of the arrow
    for(i=1; i<=n; i++)
    {
        // Print trailing (rownumber-1) spaces
        for(j=1; j<i; j++)
        {
            printf(" ");
        }

        // Print the right triangle
        for(j=1; j<=i; j++)
        {
            printf("*");
        }

        printf("\n");
    }

    return 0;
}
Output

Output:

Enter value of n : 5
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*
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    *****

Explanation:

Required knowledge

Basic C programming, For loop, Nested loop

Logic to print left arrow star pattern

Let's first divide this pattern in two parts to make our task easy.

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   ****
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    *****

If you have noticed number of spaces in the upper part per row is n - rownumber and bottom part contains rownumber - 1 spaces per row (where n is the total number of rows). If you ignore the leading spaces in both parts you will notice that the upper part is similar to inverted right triangle and lower part is similar to right triangle star pattern.

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