matrix-multiplication.c

#include <stdio.h>

  void main() {
    int a[50][50], b[50][50], c[50][50], m, n, p, q, sum;

    // User input for matrix A
    printf("Enter the number of rows for matrix A:");
    scanf("%d", & m);

    printf("Enter the number of columns for matrix A:");
    scanf("%d", & n);

    // User input for matrix B
    printf("Enter the number of rows for matrix B:");
    scanf("%d", & p);

    printf("Enter the number of columns for matrix B:");
    scanf("%d", & q);

    //Condition for multiplication of matrices
    if (n == p) {
      // User input for elements of matric A
      printf("Enter the elements in matrix A.\n");
      for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
          printf("Enter the values for the element in row %d and column %d: ", i + 1, j + 1);
          scanf("%d", & a[i][j]);
        }
      }

      // User input for elements of matric B
      printf("Enter the elements in matrix B.\n");
      for (int i = 0; i < p; i++) {
        for (int j = 0; j < q; j++) {
          printf("Enter the values for the element in row %d and column %d: ", i + 1, j + 1);
          scanf("%d", & b[i][j]);
        }
      }

      //Multiplication of the matrices
      for (int i = 0; i < m; i++) {
        for (int j = 0; j < q; j++) {
          sum = 0;

          for (int k = 0; k < n; k++) {
            sum += a[i][k] * b[k][j];
          }
          c[i][j] = sum;
        }
      }

      //Printing matrix A
      printf("\nMatrix A:\n");
      for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
          printf("%d ", a[i][j]);

        }
        printf("\n");
      }

      //Printing matrix B
      printf("\nMatrix B:\n");
      for (int i = 0; i < p; i++) {
        for (int j = 0; j < q; j++) {
          printf("%d ", b[i][j]);

        }
        printf("\n");
      }

      //Printing the resultant matrix
      printf("\nResultant matrix:\n");
      for (int i = 0; i < m; i++) {
        for (int j = 0; j < q; j++) {
          printf("%d ", c[i][j]);

        }
        printf("\n");
      }

    } else {
      //Error message if condition is not met for multiplication
      printf("The matrices cannot be multiplied.");
    }

  }