View Compilation Error

0_0_25338330_4662.cpp: In function 'int main()':
0_0_25338330_4662.cpp:21:25: error: 't' was not declared in this scope
                         t++;
                         ^
0_0_25338330_4662.cpp:23:23: error: 't' was not declared in this scope
                 cout<<t<<endl;
                       ^