View Compilation Error

0_0_26687611_18764.cpp: In function 'int main()':
0_0_26687611_18764.cpp:11:3: error: 'ch' was not declared in this scope
   ch = getchar();
   ^
0_0_26687611_18764.cpp:23:16: error: 'hetcgar' was not declared in this scope
   ch = hetcgar();
                ^