View Compilation Error

0_0_22038713_21089.cpp: In function 'int main()':
0_0_22038713_21089.cpp:5:11: error: 'cin' was not declared in this scope
     while(cin>> T >> n >> B))
           ^
0_0_22038713_21089.cpp:5:29: error: expected primary-expression before ')' token
     while(cin>> T >> n >> B))
                             ^