#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;        }