View Compilation Error

0_0_29369786_23269.cpp: In function 'int main()':
0_0_29369786_23269.cpp:19:9: error: 'cin' was not declared in this scope
         cin>>t;
         ^
0_0_29369786_23269.cpp:23:13: error: 'cout' was not declared in this scope
             cout<<result<<endl;
             ^
0_0_29369786_23269.cpp:23:27: error: 'endl' was not declared in this scope
             cout<<result<<endl;
                           ^