Write a C program to accept the elements of a 3 x 3 matrix and find its sum of the major diagonal elements The program should print the given matrix along with its sum of the major diagonal elements?

Answer 1

#include <stdio.h>

#include <conio.h>

void main() {

int d[3][3] = { 1, 2, 6, 3, 8, 5, 5, 6, 7 };

int k = 0, j = 0;

int sum1 = 0, sum2 = 0;

for (j = 0; j < 3; j++) {

for (k = 0; k < 3; k++)

printf(" %3d", d[j][k]);

printf("\n");

}

for (j = 0; j < 3; j++) {

sum1 = sum1 + d[j][j];

}

k = 3 - 1;

for (j = 0; j < 3; j++) {

if (k >= 0) {

sum2 = sum2 + d[j][k];

k--;

}

}

printf("Sum of First diagonal= %d\n", sum1);

printf("Sum of Second diagonal= %d", sum2);

getch();

Answer 2

Here is a simple C program to achieve this:

#include <stdio.h>

int main() {
    int matrix[3][3];
    int i, j, sum = 0;

    // Accept elements of the matrix
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            printf("Enter element at position [%d][%d]: ", i, j);
            scanf("%d", &matrix[i][j]);

            // Add to sum if it is on the major diagonal
            if (i == j) {
                sum += matrix[i][j];
            }
        }
    }

    // Print the matrix
    printf("Matrix:\n");
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }

    // Print the sum of major diagonal elements
    printf("Sum of major diagonal elements: %d\n", sum);

    return 0;
}

This program prompts the user to enter elements for a 3x3 matrix, calculates the sum of the major diagonal elements, and then prints the inputted matrix along with the sum of the major diagonal elements.