Question

How to check if a matrix is symmetric (square matrix that is equal to its transpose) in C

Answer 1

#include <stdio.h>  
#include <stdbool.h>  

#define COLS 4

bool checkSymmetric(int matrix[][COLS], int rows, int cols) {

    if (rows != cols) {
        return false;
    }

    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            if (matrix[i][j] != matrix[j][i]) {
                return false;
            }
        }
    }

    return true;
}

int main() {
    int matrix[][COLS] = { { 1, 5, 2, 4 },
                           { 5, 6, 3, 7 },
                           { 2, 3, 8, 0 },
                           { 4, 7, 0, 9 } };

    int rows = sizeof matrix / sizeof matrix[0];
    int cols = sizeof matrix[0] / sizeof(int);

    if (checkSymmetric(matrix, rows, cols)) {
        puts("yes");
    }
    else {
        puts("no");
    }
}




/*
run:

yes

*/

 

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