View Compilation Error

0_0_16723210_27606.cpp: In function 'int main()':
0_0_16723210_27606.cpp:6:5: error: 'string' was not declared in this scope
     string str;
     ^
0_0_16723210_27606.cpp:12:8: error: 'cin' was not declared in this scope
        cin>>str;
        ^
0_0_16723210_27606.cpp:12:13: error: 'str' was not declared in this scope
        cin>>str;
             ^