Example: 2x2 Matrix Multiplication in C

// 2x2 Matrix Multiplication
#include <stdio.h>

int main() {
    int a[2][2], b[2][2], c[2][2], i, j, k;

    // Step 1: Get elements of the first matrix
    printf("Enter elements of 2x2 Matrix A:\n");
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++) {
            printf("Enter A[%d][%d]: ", i, j);
            scanf("%d", &a[i][j]);
        }
    }

    // Step 2: Get elements of the second matrix
    printf("\nEnter elements of 2x2 Matrix B:\n");
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++) {
            printf("Enter B[%d][%d]: ", i, j);
            scanf("%d", &b[i][j]);
        }
    }

    // Step 3: Initialize the result matrix C with zeros
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++) {
            c[i][j] = 0;
        }
    }

    // Step 4: Perform matrix multiplication
    // The outer two loops iterate through rows (i) and columns (j) of the result matrix C.
    // The innermost loop (k) performs the dot product of A's row i and B's column j.
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++) {
            for (k = 0; k < 2; k++) {
                c[i][j] += a[i][k] * b[k][j];
            }
        }
    }

    // Step 5: Display the resultant matrix
    printf("\nResultant Matrix C (A * B):\n");
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++) {
            printf("%d\t", c[i][j]);
        }
        printf("\n"); // New line after each row
    }

    return 0;
}