#include<iostream>  
    #include<cstdlib>  
    #include<cstring>  
    #include<iomanip>  
    using namespace std;  
      
    void multmat(int A[], int B[], int C[], int m, int n, int p)  
    {  
        int i, j, k;  
        for(i = 0; i < m; ++i)  
            for(j = 0; j < p; ++j)  
            {  
                int s = 0;  
                for(k = 0; k < n; ++k)  
                    s += A[i*n + k]*B[k*p + j];  
                C[i*p + j] = s;  
            }  
        return;  
    }  
      
    int main(void)  
    {  
        const int MAX = 1000;  
        int A[MAX], B[MAX], C[MAX];  
        int m, n, p;  
      
        cout << "input m,n,p: ";  
        cin >> m >> n >> p;  
      
        if(m*n >= MAX || n*p >= MAX || m*p >= MAX)  
        {  
            cout << "mem ex." << endl;  
            return -1;  
        }  
      
        cout << "input matrix A: " << endl;  
        for(int i = 0; i < m; ++i)  
            for(int j = 0; j < n; ++j)  
                cin >> A[i*n + j];  
          
        cout << "input matrix B: " << endl;  
        for(int i = 0; i < n; ++i)  
            for(int j = 0; j < p; ++j)  
                cin >> B[i*p + j];  
      
        multmat(A, B, C, m, n, p);  
      
        cout<< "the matrix C is: "<< endl;  
        for(int i = 0; i < m; ++i)  
        {  
            for(int j = 0; j < p; ++j)  
            {  
                cout << setw(3) << C[i*p + j] << ' ';  
            }  
            cout << endl;  
        }  
      
        system("pause");  
        return 0;  
    }