c语言：矩阵相乘-矩阵相加 新手练习1

#include<stdio.h>

#include<stdlib.h>

#include<time.h>

#include<string.h>

void main()

{

    int a[4][4];

    int b[4][4];

    int c[4][4];

    int i,j,k,s,t,m,n;

    srand(time(0));

    for(i=0;i<=3;i++)

        for(j=0;j<=3;j++)

            a[i][j]=rand()%20+1;

                printf("a is \n");

                for(i=0;i<=3;i++)

                {

                 

                    for(j=0;j<=3;j++)

                         

                         

                            printf("%5d",a[i][j]);

                                printf("\n");

                                    printf("\n");

            }

                         

                            for(i=0;i<=3;i++)

                            for(j=0;j<=3;j++)

                                b[i][j]=rand()%20+1;

                                printf("b is \n");

                                            for(i=0;i<=3;i++)

                                            {

                                             

                                            for(j=0;j<=3;j++)

                                             

                                                 

                                                printf("%5d",b[i][j]);

                                                    printf("\n");

                                                        printf("\n");

                                            }

                                                for(i=0;i<=3;i++)

                                                    for(j=0;j<=3;j++)

                                                        c[i][j]=a[i][j]+b[i][j];

                                                            printf("c is \n");

                                                             

                                                                for(i=0;i<=3;i++)

                                            {

                                             

                                            for(j=0;j<=3;j++)

                                             

                                                 

                                                printf("%5d",c[i][j]);

                                                    printf("\n");

                                                        printf("\n");

                                            }

                                            int z;

                                            z=0;

                                    printf("a is \n");

                                        for(i=0;i<=3;i++)

                {

                 

                    for(j=0;j<=3;j++)

                         

                         

                            printf("%5d",a[i][j]);

                                printf("\n");

                                    printf("\n");

            }

 

                            int my=0;

                            int sb=0;

                            k=0;

                            int jsq=0;

                                                            printf("my is : \n");

                                    for(k=0;k<=3;k++)

                                    {

                                        for(i=0;i<=3;i++)

                                    {

                                     

                                    for(j=0;j<=3;j++)

                                    {

                                 

                                    sb=a[k][j]*b[j][i];

                                    my=my+sb;

                                     

                                    }

                                    c[k][i]=my;

         

                                    printf("%5d",c[k][i]);

                                    jsq++;

                                    if(jsq%4==0)

                                    printf("\n");

                                    my=0;

                                }

                            }                                                    

                             }