View Compilation Error

0_0_21511879_22490.cpp: In function 'int main()':
0_0_21511879_22490.cpp:9:15: error: 'cin' was not declared in this scope
         while(cin>>t;){
               ^
0_0_21511879_22490.cpp:9:21: error: expected ')' before ';' token
         while(cin>>t;){
                     ^
0_0_21511879_22490.cpp:9:22: error: expected primary-expression before ')' token
         while(cin>>t;){
                      ^