Question

How to check whether a matrix is a square matrix in C

Answer 1

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

#define COLS 4

bool isSquareMatrix(int matrix[][COLS], int rows, int cols) {
    // Check if the matrix is empty
    if (rows == 0 || cols == 0) {
        return false; // An empty matrix is not a square matrix
    }

    // Check if the number of rows equals the number of columns
    return rows == cols;
}

int main() {
    // Initialize the matrix
    int matrix[][COLS] = {
        {5, 8, 9, 10},
        {1, 4, 6, 13},
        {7, 3, 0, 18},
        {6, 8, 9, 20}
    };
    
    // Calculate the total size of the matrix in bytes
    size_t totalSize = sizeof(matrix);

    // Calculate the size of one row
    size_t rowSize = sizeof(matrix[0]); 

    // Calculate the number of rows and columns
    size_t rows = totalSize / rowSize;

    if (isSquareMatrix(matrix, rows, COLS)) {
        printf("The matrix is a square matrix.\n");
    } else {
        printf("The matrix is not a square matrix.\n");
    }

    return 0;
}


/*
run:

The matrix is not a square matrix.

*/

 

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Answer 2

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

#define COLS 4

bool isSquareMatrix(int matrix[][COLS], int totalSize, int cols) {
    // Calculate the size of one row
    size_t rowSize = sizeof(matrix[0]);

    // Calculate the number of rows and columns
    size_t rows = totalSize / rowSize;
    
    // Check if the matrix is empty
    if (rows == 0 || cols == 0) {
        return false; // An empty matrix is not a square matrix
    }

    // Check if the number of rows equals the number of columns
    return rows == cols;
}

int main() {
    // Initialize the matrix
    int matrix[][COLS] = {
        {5, 8, 9, 10},
        {1, 4, 6, 13},
        {7, 3, 0, 18},
        {6, 8, 9, 20}
    };
    
    if (isSquareMatrix(matrix, sizeof(matrix), COLS)) {
        printf("The matrix is a square matrix.\n");
    } else {
        printf("The matrix is not a square matrix.\n");
    }

    return 0;
}


/*
run:

The matrix is a square matrix.

*/

 

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