Matrix Multiplication In C Using Function Code Example

Example 1: how to do matrix multiplication in c

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

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");         }     } }