C Programming Code Examples C > Arrays and Matrices Code Examples program to find sum of main diagonal elements of a matrix program to find sum of main diagonal elements of a matrix Write a C program to read elements in a matrix and find the sum of main diagonal (major diagonal) elements of matrix. Find sum of all elements of main diagonal of a matrix. #include <stdio.h> #define SIZE 3 // Matrix size int main() { int A[SIZE][SIZE]; int row, col, sum = 0; /* Input elements in matrix from user */ printf("Enter elements in matrix of size %dx%d: \n", SIZE, SIZE); for(row=0; row<SIZE; row++) { for(col=0; col<SIZE; col++) { scanf("%d", &A[row][col]); } } /* Find sum of main diagonal elements */ for(row=0; row<SIZE; row++) { sum = sum + A[row][row]; } printf("\nSum of main diagonal elements = %d", sum); return 0; }
