为什么在两个for循环里出现了重复定义?

我完全照着书打的,编译器说我重复定义!!
    int table[3][4]={{1,2,3,4},{2,3,4,5},{3,4,5,6}};
    for(int i=0;i<3;i++)
    {
        for(int j=0;j<4;j++)
            cout<<table[i][i]<<" ";
        cout<<endl;
    }
    rowSum(table,3);
    for(int i=0;i<3;i++)
        cout<<"Sum of row "<<i<<" is "<<table[i][0]<<endl;


) : error C2374: 'i' : redefinition; multiple initialization
p(15) : see declaration of 'i'

难道是我的编译器有问题?