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# C program to find the sum of border elements of an array

## c program for how to find the sum of border elements of an array

Posted on 23 Oct 2017 Category: C Views: 649

Edited on 07 May 2018

C program to find the sum of border elements of an array

In this article, we will see how to find the sum of border elements of an array using C program. C code for the computation is given below:

``````#include <stdio.h>
#include <conio.h>
void main()
{
int a[25][25],i,j,r,c,sum=0;
printf(“Enter the row size :”);
scanf(“%d”,&r);
printf(“Enter the coloumn size :”);
scanf(“%d”,&c);
printf(“Enter the array elements :”);
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
scanf(“%d”,&a[i][j]);
}
}
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
if((i==0||i==(r-1))||(j==0||j==(c-1)))
sum=sum+a[i][j];
}
}
printf(“\n Sum of border elements =%d”,sum);
getch();
}
``````

In this program we have taken a 3x3 matrix that is row size is 3 and column size is also 3. The code works as follows:-

1. Read the row and column
2. Read the array elements(matrix elements)
3. Check ((i==0||i==(r-1))||(j==0||j==(c-1))), if so

3.1) set sum=sum+a[i][j],till j<c

4. Increment j

5.Repeat the steps 3 to 4 till i<r, i++

6. Print sum

output

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