C Program to Print Alphabet I Pattern

In this article, we will show how to write a C program to print the Alphabet I pattern or shape of stars using for loop, while loop, and functions.

#include <stdio.h>

int main()
{
    int rows;

    printf("Enter Rows = ");
    scanf("%d",&rows);

    for (int i = 0 ; i < rows; i++ )
	{
    	for (int j = 0 ; j < rows; j++ )
		{
			if (i == 0 || j == rows / 2 || i == rows - 1)
			{
				printf("*");
			}
			else
			{
				printf(" ");
			}
		}
		printf("\n");
	}

    return 0;
}

Enter Rows = 16
****************
        *       
        *       
        *       
        *       
        *       
        *       
        *       
        *       
        *       
        *       
        *       
        *       
        *       
        *       
****************

Instead of a for loop, this Alphabet I Pattern of stars program uses a while loop to iterate the rows and columns. For more star programs, click here.

#include <stdio.h>

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

    printf("Enter Rows = ");
    scanf("%d",&rows);

    i = 0 ;
	while ( i < rows)
	{
		j = 0 ;
		while ( j < rows )
		{
			if (i == 0 || j == rows / 2 || i == rows - 1)
			{
				printf("*");
			}
			else
			{
				printf(" ");
			}
			j++;
		}
		printf("\n");
		i++;
	}

    return 0;
}

Enter Rows = 19
*******************
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
         *         
*******************

In this C program, we create an alphabetIPat function that accepts those values and prints the Alphabet I Pattern of the given char.

#include <stdio.h>

void alphabetIPat(int rows, char a)
{
	for (int i = 0 ; i < rows; i++ )
	{
		for (int j = 0; j < rows; j++)
		{
			if (i == 0 || j == rows / 2 || i == rows - 1)
			{
				printf("%c", a);
			}
			else
			{
				printf(" ");
			}
		}
		printf("\n");
	}
}

int main()
{
    int rows;
    char a;

    printf("Enter Alphabet =  ");
    scanf("%c", &a);

    printf("Enter Rows = ");
    scanf("%d",&rows);

    alphabetIPat(rows, a);
    return 0;
}