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];
}
}
}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];
}
}
}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;
}Copyright © 2021 Codeinu
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