C program to calculate sum of Upper Triangular Elements in C

#include< stdio.h>
#include< conio.h>
void main()
{
int i,j,a[10][10],sum,m,n;
/* m - Number of rows 
   n - Number of Columns */
printf("\nEnter the number of Rows : ");
scanf ("%d",&m);
printf("\nEnter the number of Columns : ");
scanf ("%d",&n);
/* Accept the Elements in m x n Matrix */
for( i = 0 ; i < m ; i++ )
       for( j = 0 ; j < n ; j++ )
       {
       printf("Enter the Element a[%d][%d] : ", i , j);
       scanf("%d",&a[i][j]);
       } 
/* Addition of all Diagonal Elements */
sum = 0;
for( i = 0 ; i < m ; i++ )
       for( j = 0 ; j < n ; j++ )
       {
        if ( i < j )             // Condition for Upper Triangle
        sum = sum + a[i][j];
       } 
/* Print out the Result */
printf("\nThe Addition of Upper Triangle Elements : %d",sum); 
getch();
}

Output

Enter the number of Rows : 3
Enter the number of Columns : 3
Enter the Element a[0][0] : 1
Enter the Element a[0][1] : 2
Enter the Element a[0][2] : 3
Enter the Element a[1][0] : 2
Enter the Element a[1][1] : 1
Enter the Element a[1][2] : 1
Enter the Element a[2][0] : 1
Enter the Element a[2][1] : 2
Enter the Element a[2][2] : 1
The Addition of Upper Triangle Elements : 6

Explanation :

Considering above 3×3 matrix -

1. By Observing , it is clear that when i < j Condition is true then and then only we have to add the elements

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