View Compilation Error

0_0_28896967_6109.cpp: In function 'int Gauss_xor(int, int)':
0_0_28896967_6109.cpp:108:21: error: 'i' was not declared in this scope
                 for(i = 0; i < var + 1; i++)    //将第一个第col列系数非零的行换到第k行
                     ^
0_0_28896967_6109.cpp: In function 'int main()':
0_0_28896967_6109.cpp:144:16: error: 'b' was not declared in this scope
         memset(b,0,sizeof(b));
                ^