Compilare: user.cpp: In function ‘int cmmdc(int, int)’: user.cpp:20:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:23:9: warning: unused variable ‘x’ [-Wunused-variable] int a,b,x,y; ^ user.cpp:23:11: warning: unused variable ‘y’ [-Wunused-variable] int a,b,x,y; ^ user.cpp: In function ‘int cmmdc(int, int)’: user.cpp:9:4: warning: ‘x’ is used uninitialized in this function [-Wuninitialized] a=x; ^ user.cpp:10:4: warning: ‘y’ is used uninitialized in this function [-Wuninitialized] b=y; ^