2x2 Matrix Multiplication In C Code Example

Example 1: matrix multiplication in c

#include <stdio.h>  // function to get matrix elements entered by the user void getMatrixElements(int matrix[][10], int row, int column) {     printf("\nEnter elements: \n");     for (int i = 0; i < row; ++i) {       for (int j = 0; j < column; ++j) {          printf("Enter a%d%d: ", i + 1, j + 1);          scanf("%d", &matrix[i][j]);       }    } }  // function to multiply two matrices void multiplyMatrices(int first[][10],                       int second[][10],                       int result[][10],                       int r1, int c1, int r2, int c2) {     // Initializing elements of matrix mult to 0.    for (int i = 0; i < r1; ++i) {       for (int j = 0; j < c2; ++j) {          result[i][j] = 0;       }    }     // Multiplying first and second matrices and storing it in result    for (int i = 0; i < r1; ++i) {       for (int j = 0; j < c2; ++j) {          for (int k = 0; k < c1; ++k) {             result[i][j] += first[i][k] * second[k][j];          }       }    } }  // function to display the matrix void display(int result[][10], int row, int column) {     printf("\nOutput Matrix:\n");    for (int i = 0; i < row; ++i) {       for (int j = 0; j < column; ++j) {          printf("%d  ", result[i][j]);          if (j == column - 1)             printf("\n");       }    } }  int main() {    int first[10][10], second[10][10], result[10][10], r1, c1, r2, c2;    printf("Enter rows and column for the first matrix: ");    scanf("%d %d", &r1, &c1);    printf("Enter rows and column for the second matrix: ");    scanf("%d %d", &r2, &c2);     // Taking input until    // 1st matrix columns is not equal to 2nd matrix row    while (c1 != r2) {       printf("Error! Enter rows and columns again.\n");       printf("Enter rows and columns for the first matrix: ");       scanf("%d%d", &r1, &c1);       printf("Enter rows and columns for the second matrix: ");       scanf("%d%d", &r2, &c2);    }     // get elements of the first matrix    getMatrixElements(first, r1, c1);     // get elements of the second matrix    getMatrixElements(second, r2, c2);     // multiply two matrices.    multiplyMatrices(first, second, result, r1, c1, r2, c2);     // display the result    display(result, r1, c2);     return 0; }

Example 2: matrix multiplication in c

#include <stdio.h> void enterData(int first[][10], int second[][10], int r1, int c1, int r2, int c2); void multiplyMatrices(int first[][10], int second[][10], int multResult[][10], int r1, int c1, int r2, int c2); void display(int mult[][10], int r1, int c2);  int main() {     int first[10][10], second[10][10], mult[10][10], r1, c1, r2, c2;     printf("Enter rows and column for the first matrix: ");     scanf("%d %d", &r1, &c1);     printf("Enter rows and column for the second matrix: ");     scanf("%d %d", &r2, &c2);      // Taking input until columns of the first matrix is equal to the rows of the second matrix     while (c1 != r2) {         printf("Error! Enter rows and columns again.\n");         printf("Enter rows and columns for the first matrix: ");         scanf("%d%d", &r1, &c1);         printf("Enter rows and columns for the second matrix: ");         scanf("%d%d", &r2, &c2);     }      // Function to take matrices data     enterData(first, second, r1, c1, r2, c2);      // Function to multiply two matrices.     multiplyMatrices(first, second, mult, r1, c1, r2, c2);      // Function to display resultant matrix after multiplication.     display(mult, r1, c2);      return 0; }  void enterData(int first[][10], int second[][10], int r1, int c1, int r2, int c2) {     printf("\nEnter elements of matrix 1:\n");      for (int i = 0; i < r1; ++i) {         for (int j = 0; j < c1; ++j) {             printf("Enter a%d%d: ", i + 1, j + 1);             scanf("%d", &first[i][j]);         }     }     printf("\nEnter elements of matrix 2:\n");      for (int i = 0; i < r2; ++i) {         for (int j = 0; j < c2; ++j) {             printf("Enter b%d%d: ", i + 1, j + 1);             scanf("%d", &second[i][j]);         }     } }  void multiplyMatrices(int first[][10], int second[][10], int mult[][10], int r1, int c1, int r2, int c2) {      // Initializing elements of matrix mult to 0.     for (int i = 0; i < r1; ++i) {         for (int j = 0; j < c2; ++j) {             mult[i][j] = 0;         }     }      // Multiplying first and second matrices and storing in mult.     for (int i = 0; i < r1; ++i) {         for (int j = 0; j < c2; ++j) {             for (int k = 0; k < c1; ++k) {                 mult[i][j] += first[i][k] * second[k][j];             }         }     } }  void display(int mult[][10], int r1, int c2) {      printf("\nOutput Matrix:\n");     for (int i = 0; i < r1; ++i) {         for (int j = 0; j < c2; ++j) {             printf("%d  ", mult[i][j]);             if (j == c2 - 1)                 printf("\n");         }     } }