View Compilation Error

0_0_36753955_406.cpp: In function 'int main()':
0_0_36753955_406.cpp:7:3: error: 't' was not declared in this scope
   t=a;
   ^
0_0_36753955_406.cpp:12:3: error: 't' was not declared in this scope
   t=c;
   ^