C Program to Print Hollow Square Pattern With Diagonals

Write a C Program to Print Hollow Square Star Pattern With Diagonals using for loop. This example uses the nested for loops to iterate rows and columns and if else to check for diagonals to print Hollow Square star Pattern With Diagonals.

#include<stdio.h>
int main()
{
    int i, j, rows;
    printf("Enter Hollow Square with Diagonals Rows =  ");
    scanf("%d", &rows);

    printf("Hollow Square Star Pattern With Diagonals\n");
    for(i = 1; i <= rows; i++)
    {
        for(j = 1; j <= rows; j++)
        {
            if(i == 1 || i == rows || i == j || j == 1 || j == rows || j == rows - i + 1)
            {
                printf("* ");
            }
            else
            {
                printf("  ");
            }         
        }
        printf("\n");   
    }
    return 0;
}

This C Program allows entering symbols to print the Hollow Square Pattern With Diagonals using a while loop.

#include<stdio.h>
int main()
{
    int i, j, rows;
    char ch;
    
    printf("Symbol for Hollow Square with Diagonals =  ");
    scanf("%c", &ch);

    printf("Enter Hollow Square with Diagonals Rows =  ");
    scanf("%d", &rows);

    printf("Hollow Square Pattern With Diagonals\n");
    i = 1;
    while(i <= rows)
    {
        j = 1;
        while(j <= rows)
        {
            if(i == 1 || i == rows || i == j || j == 1 || j == rows || j == rows - i + 1)
            {
                printf("%c ", ch);
            }
            else
            {
                printf("  ");
            } 
            j++;        
        }
        printf("\n");  
        i++; 
    }
    return 0;
}

Symbol for Hollow Square with Diagonals =  #
Enter Hollow Square with Diagonals Rows =  12
Hollow Square Pattern With Diagonals
# # # # # # # # # # # # 
# #                 # # 
#   #             #   # 
#     #         #     # 
#       #     #       # 
#         # #         # 
#         # #         # 
#       #     #       # 
#     #         #     # 
#   #             #   # 
# #                 # # 
# # # # # # # # # # # #