Matrix Multiplication C++

Question

I am having some trouble multiplying matrices and printing the result out. My code is as follows:

#include <iostream>
using namespace std;
int main() {
    int matArow, matAcol, matBrow, matBcol, itervar1, itervar2, itervar3, value;
    cin >> matArow >> matAcol;
    int matA[matArow][matAcol];
    for (itervar1 = 0; itervar1 < matArow; itervar1++) {
        for (itervar2 = 0; itervar2 < matAcol; itervar2++) {
            cin >> matA[itervar1][itervar2];
        }
    }
    cin >> matBrow >> matBcol;
    if (matBrow != matAcol) {
        cout << "Impossible\n";
        return 0;
    }
    int matB[matBrow][matBcol];
    for (itervar1 = 0; itervar1 < matBrow; itervar1++) {
        for (itervar2 = 0; itervar2 < matBcol; itervar2++) {
            cin >> matB[itervar1][itervar2];
        }
    }
    int matC[matArow][matBcol];
    for (itervar1 = 0; itervar1 < matArow; itervar1++) {
        for (itervar2 = 0; itervar2 < matBcol; itervar2++) {
            value = 0;
            for (itervar3 = 0; itervar3 < matAcol; itervar3++) {
                value += matA[itervar1][itervar3];
                value += matB[itervar3][itervar2];
            }
            matC[itervar1][itervar2] = value;
        }
    }
    for ( itervar1 = 0; itervar1 < matArow; itervar1++ ) {
        for ( itervar2 = 0; itervar2 < matBcol; itervar2++ ) {
            cout << matC[itervar1][itervar2] << ' ';
        }
        cout << endl;
    }
    return 0;
}

The code doesn't return any errors, but results in incorrect matrix multiplication. Any help would be greatly appreciated.

Answer 1

value += matA[itervar1][itervar3]; value += matB[itervar3][itervar2];

不应该是

value += matA[itervar1][itervar3] * matB[itervar3][itervar2];