View Compilation Error

0_0_21761680_24046.cpp: In function 'int main()':
0_0_21761680_24046.cpp:42:17: error: 'cin' was not declared in this scope
     while(scanf(cin>>m)
                 ^
0_0_21761680_24046.cpp:43:5: error: expected ')' before '{' token
     {
     ^