## Sep 5, 2020

### C Program to Print Hollow Square Number Pattern with Diagonals

Ex: Write a C program to print hollow square number pattern with diagonal. How to write a C program to print hollow square number pattern with diagonal. C program to print hollow square number pattern with diagonal.

Input from user:

Enter the number: 9

Expected output:

### Step by step logic of the given program:

To understand this pattern, first you need to understand previous exercises hollow square number pattern.

1. Accept input number from user declare variable say no.

2. Run outer loop from 1 to no, which shows rows in pattern.

3.

Run inner loop from 1 to no

to print columns in pattern.

4. Inside the inner loop using if statement give conditions to print number:

if(i==1||i==no||j==1||j==no||j==ic||j==dc)

5. Otherwise print spaces.

6. Outside the block of inner for loop, print newline \n.

## C program to print hollow square number pattern with diagonal:

#include<stdio.h>

void main()

{

int no,i,j;

int ic=1,dc;

printf("Enter the number:");

scanf("%d",&no);

dc=no;

for(i=1;i<=no;i++)

{

for(j=1;j<=no;j++)

{

/*Give conditions to print value of j*/                                  if(i==1||i==no||j==1||j==no||j==ic||j==dc)

{

printf("%d",j);

}

else

{

/*To print spaces*/

printf(" ");

}

}

ic++;

dc--;

/*for next row*/

printf("\n");

}

}

Above program shows the following output: