求2个3维矩阵乘法，提示出错，高手给看一下
#include
#include
int main (void)
{
int A[3][3]={{1,2,3},{4,5,6},{7,8,9}};
int B[3][3]={{-1,2,1},{2,1,1},{3,-5,1}};
int C[3][3];
int i,j,a,sum;
for(j=0;j#includeint main (void){ int A[3][3]={{1,2,3},{4,5,6},{7,8,9}}; int B[3][3]={{-1,2,1},{2,1,1},{3,-5,1}}; int C[3][3]={0}; int i,j,a,sum; for(j=0;j<=2;j++) {for(i=0;i<=2;i++){ for(a=0;a<=2;a++){ sum=A[j][a]*B[a]; C[j]+=sum;}printf(" %d ",C[j]);
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