﻿ C exercises: Find the sum of left diagonals of a matrix - w3resource

# C Exercises: Find the sum of left diagonals of a matrix

## C Array: Exercise-24 with Solution

Write a program in C to find sum of left diagonals of a matrix.

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>

void main()

{
int i,j,arr1[50][50],sum=0,n,m=0;

printf("\n\nFind sum of left diagonals of a matrix :\n");
printf("---------------------------------------\n");

printf("Input the size of the square matrix : ");
scanf("%d", &n);
m=n;
printf("Input elements in the first matrix :\n");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
printf("element - [%d],[%d] : ",i,j);
scanf("%d",&arr1[i][j]);
}
}
printf("The matrix is :\n");
for(i=0;i<n;i++)
{
for(j=0;j<n ;j++)
printf("% 4d",arr1[i][j]);
printf("\n");
}
// calculate the sum of left diagonals
for(i=0;i<n;i++)
{
m=m-1;
for(j=0;j<n ;j++)
{
if (j==m)
{
sum= sum+arr1[i][j];
}

}
}
printf("Addition of the  left Diagonal elements is :%d\n",sum);
}

Sample Output:

Find sum of left diagonals of a matrix :
---------------------------------------
Input the size of the square matrix : 2
Input elements in the first matrix :
element - [0],[0] : 1
element - [0],[1] : 2
element - [1],[0] : 3
element - [1],[1] : 4
The matrix is :
1   2
3   4
Addition of the  left Diagonal elements is :5

Flowchart:

C Programming Code Editor:

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## C Programming: Tips of the Day

Where is the C auto keyword used?

auto is a modifier like static. It defines the storage class of a variable. However, since the default for local variables is auto, you don't normally need to manually specify it.

Ref : https://bit.ly/3yzwC9r