矩阵相乘

Posted 2021-02-13 chuxinbubian

#include<iostream>
#include<string>
#include<stdlib.h>
using namespace std;
void MatrixMul(double A[],double B[],int m,int n,int k,double C[])
{
    int i,j,l,u;
    for(i=0;i<m;i++)
    {
        for(j=0;j<k;j++)
        {
            u=i*k+j;
            C[u]=0.0;
            for(l=0;l<n;l++)
            {
                C[u] +=A[i*n+l]*B[l*k+j];
            }
        }
    }
}
int main()
{
    double A[3][3]={{1.0,2.0,3.0},
                    {4.0,5.0,6.0},
                    {7.0,8.0,9.0}};
    double B[3][3]={{2.0,-2.0,1.0},
                    {1.0,3.0,9.0},
                    {17.0,-3.0,7.0}};
    double C[3][3];
    int m,n,k,i,j;
    m=3;
    n=3;
    k=3;
    cout<<"矩阵A B相乘的结果是："<<endl;
    MatrixMul(*A,*B,m,n,k,*C);
    for(i=0;i<m;i++)
    {
        for(j=0;j<n;j++)
        {
            cout<<C[i][j]<<endl; 
        }
     } 
    return 0;
 }