What should i do when i have this error: argument of type "int" is incompatible with parameter of type "int(*)[101]" in c++

Question

#include <iostream>
using namespace std;

void readMatrixA(int lenght)
{
    int matrixA[101][101];
    for (int i = 0; i < lenght; i++)
        for (int j = 0; j < lenght; j++)
            cin >> matrixA[i][j];
}

void readMatrixB(int lenght)
{
    int matrixB[101][101];
    for (int i = 0; i < lenght; i++)
        for (int j = 0; j < lenght; j++)
            cin >> matrixB[i][j];
}

void matrixMultiplication(int matrixA[101][101], int matrixB[101][101],int lenght)
{
    int i, j, matrixC[101][101];
    if (lenght <= 2)
    {
        for (i = 0; i < lenght; i++)
            for (j = 0; j < lenght; j++)
            {
                matrixC[i][j] = 0;
                for (int k = 0; k < lenght; k++)
                    matrixC[i][j] += matrixA[i][k] * matrixB[k][j];
            }
    }
    else
    {
        matrixC[1][1]=matrixMultiplication(matrixA[1][1], matrixB[1][1], lenght / 2) + matrixMultiplication(matrixA[1][2], matrixB[2][1], lenght / 2);
        matrixC[1][2]=matrixMultiplication(matrixA[1][1], matrixB[1][2], lenght / 2) + matrixMultiplication(matrixA[1][2], matrixB[2][2], lenght / 2);
        matrixC[2][1]=matrixMultiplication(matrixA[2][1], matrixB[1][1], lenght / 2) + matrixMultiplication(matrixA[2][2], matrixB[2][1], lenght / 2);
        matrixC[2][2]=matrixMultiplication(matrixA[2][1], matrixB[1][2], lenght / 2) + matrixMultiplication(matrixA[2][2], matrixB[2][2], lenght / 2);
    }

    for (i = 0; i < lenght; i++)
    {
        for (j = 0; j < lenght; j++)
        {
            cout << matrixC[i][j] << " ";
        }
        cout << endl;
    }
}

int main()
{
    int lenght;
    cout << "Introduceti dimensiunea matricelor: "; cin >> lenght;
    int matrixA[101][101], matrixB[101][101], matrixC[101][101];
    cout << "Introduceti matricea A: ";
    readMatrixA(lenght);
    cout << "Introduceti matricea B: ";
    readMatrixB(lenght);
    matrixMultiplication(matrixA, matrixB, lenght);
    return 0;
}

This is a code for Strassen's matrix multiplication written in visual studio. The code is using divide and conquer technique for square matrix.

Inside the "matrixMultiplication" function, where are those 4 rows of calls, i have this error "argument of type "int" is incompatible with parameter of type "int(*)[101]"" and i don't know what to do.

Those are the rows with error.

        matrixC[1][1]=matrixMultiplication(matrixA[1][1], matrixB[1][1], lenght / 2) + matrixMultiplication(matrixA[1][2], matrixB[2][1], lenght / 2);
        matrixC[1][2]=matrixMultiplication(matrixA[1][1], matrixB[1][2], lenght / 2) + matrixMultiplication(matrixA[1][2], matrixB[2][2], lenght / 2);
        matrixC[2][1]=matrixMultiplication(matrixA[2][1], matrixB[1][1], lenght / 2) + matrixMultiplication(matrixA[2][2], matrixB[2][1], lenght / 2);
        matrixC[2][2]=matrixMultiplication(matrixA[2][1], matrixB[1][2], lenght / 2) + matrixMultiplication(matrixA[2][2], matrixB[2][2], lenght / 2);

Answer 1

In your MatrixMultiplication() function you return a void, but your program is waiting for it to return an int. You need to change MatrixMultiplication to return an int.