C program to add the diagonal elements of a matrix

C program to add the diagonal elements of a matrix

Output:

Enter the elements of the 3x3 array:
1 2 3
4 5 6
7 8 9
The sum of the diagonal elements is 15

Implementation:

#include <stdio.h> #define r 3 #define c 3 int main(void) { int a[r][c],diagsum=0; int i,j; printf("Enter the elements of the 3x3 array:\n"); 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==j) diagsum+=a[i][j]; } } printf("The sum of the diagonal elements is %d",diagsum); return 0; }