#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; } } }原文：https://www.cnblogs.com/jx3ajmd/p/9610398.html