C Program to Print Alphabet G Pattern

In this article, we will show how to write a C program to print the Alphabet G 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 < 2 * rows; j++ )
		{
			if ((i == 0 || i == rows - 1) && (j == 0 || j == (2 * rows) - 2))
			{
				printf(" ");
			}
			else if ((j == 0) || (i == 0 && j <= rows) || (i == rows / 2 && j > rows / 2)
					|| (i > rows / 2 && j == (2 * rows) - 1) || (i == rows - 1 && j < 2 * rows))
			{
				printf("*");
			}
			else
			{
				printf(" ");
			}

		}
		printf("\n");
	}

    return 0;
}

Enter Rows = 17
 *****************                
*                                 
*                                 
*                                 
*                                 
*                                 
*                                 
*                                 
*        ***************
*                                *
*                                *
*                                *
*                                *
*                                *
*                                *
*                                *
 ********************

Instead of a for loop, this Alphabet G 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 < (2 * rows) - 1)
		{
			if ((i == 0 || i == rows - 1) && (j == 0 || j == (2 * rows) - 3))
			{
				printf(" ");
			}
			else if ((j == 0) || (i == 0 && j <= rows) || (i == rows / 2 && j > rows / 2)
					|| (i > rows / 2 && j == (2 * rows) - 3) || (i == rows - 1 && j < (2 * rows)- 2))
			{
				printf("*");
			}
			else
			{
				printf(" ");
			}
			j++;
		}
		printf("\n");
		i++;
	}

    return 0;
}

Enter Rows = 15
 ***************             
*                            
*                            
*                            
*                            
*                            
*                            
*       ************
*                          * 
*                          * 
*                          * 
*                          * 
*                          * 
*                          * 
 ****************

In this C program, we create an alphabetGPat function that accepts those values and prints the Alphabet G shape or pattern of the given char.

#include <stdio.h>

void alphabetGPat(int rows, char a)
{
	for (int i = 0 ; i < rows; i++ )
	{
		for (int j = 0; j < 2 * rows; j++)
		{
			if ((i == 0 || i == rows - 1) && (j == 0 || j == (2 * rows) - 2))
			{
				printf(" ");
			}
			else if ((j == 0) || (i == 0 && j <= rows)
					|| (i == rows / 2 && j > rows / 2)
					|| (i > rows / 2 && j == (2 * rows) - 1)
					|| (i == rows - 1 && j < 2 * rows))
			{
				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);

    alphabetGPat(rows, a);
    return 0;
}