View Compilation Error

0_0_38255250_1493.cpp: In function 'int main()':
0_0_38255250_1493.cpp:7:5: error: 'in' was not declared in this scope
     in t;
     ^
0_0_38255250_1493.cpp:8:12: error: 't' was not declared in this scope
     cin >> t;
            ^