Eroare de compilare: user.cpp:14:12: error: ‘::main’ must return ‘int’ void main () ^ user.cpp: In function ‘int main()’: user.cpp:20:3: error: return-statement with no value, in function returning ‘int’ [-fpermissive] return ; ^ user.cpp:23:3: error: return-statement with no value, in function returning ‘int’ [-fpermissive] return; ^ user.cpp: In function ‘int cmmdc(int, int)’: user.cpp:13:1: warning: control reaches end of non-void function [-Wreturn-type] } ^