Example: Matrix Multiplication User Input in C

// Matrix Multiplication User Input
#include <stdio.h>

#define MAX_SIZE 10 // Maximum size for matrix dimensions

int main() {
    int row1, col1, row2, col2;
    int matrix1[MAX_SIZE][MAX_SIZE];
    int matrix2[MAX_SIZE][MAX_SIZE];
    int result[MAX_SIZE][MAX_SIZE];

    // Step 1: Get dimensions for Matrix 1 from user
    printf("Enter dimensions for Matrix 1 (rows columns): ");
    scanf("%d %d", &row1, &col1);

    // Step 2: Get dimensions for Matrix 2 from user
    printf("Enter dimensions for Matrix 2 (rows columns): ");
    scanf("%d %d", &row2, &col2);

    // Step 3: Check for valid multiplication dimensions
    if (col1 != row2) {
        printf("Error: Matrices cannot be multiplied. Number of columns in Matrix1 must equal number of rows in Matrix2.\n");
        return 1;
    }

    // Step 4: Get elements for Matrix 1 from user
    printf("Enter elements for Matrix 1 (%dx%d):\n", row1, col1);
    for (int i = 0; i < row1; i++) {
        for (int j = 0; j < col1; j++) {
            printf("Enter element matrix1[%d][%d]: ", i, j);
            scanf("%d", &matrix1[i][j]);
        }
    }

    // Step 5: Get elements for Matrix 2 from user
    printf("Enter elements for Matrix 2 (%dx%d):\n", row2, col2);
    for (int i = 0; i < row2; i++) {
        for (int j = 0; j < col2; j++) {
            printf("Enter element matrix2[%d][%d]: ", i, j);
            scanf("%d", &matrix2[i][j]);
        }
    }

    // Step 6: Initialize the result matrix with zeros
    for (int i = 0; i < row1; i++) {
        for (int j = 0; j < col2; j++) {
            result[i][j] = 0;
        }
    }

    // Step 7: Perform matrix multiplication (same logic as Approach 1)
    for (int i = 0; i < row1; i++) {
        for (int j = 0; j < col2; j++) {
            for (int k = 0; k < col1; k++) {
                result[i][j] += matrix1[i][k] * matrix2[k][j];
            }
        }
    }

    // Step 8: Print the result matrix
    printf("\nResultant Matrix C (%dx%d):\n", row1, col2);
    for (int i = 0; i < row1; i++) {
        for (int j = 0; j < col2; j++) {
            printf("%d\t", result[i][j]);
        }
        printf("\n");
    }

    return 0;
}