View Compilation Error

0_0_37604299_11973.cpp: In function 'int main()':
0_0_37604299_11973.cpp:7:12: error: 'cin' was not declared in this scope
     while (cin>>m1>>m2){
            ^
0_0_37604299_11973.cpp:9:29: error: 'memset' was not declared in this scope
         memset(s,0,sizeof(s));
                             ^
0_0_37604299_11973.cpp:11:13: error: request for member 'size' in 's', which is of non-class type 'char [210]'
         l=s.size()
             ^
0_0_37604299_11973.cpp:12:23: error: 'i' was not declared in this scope
         for (int i=0; i<l; i++) {
                       ^