Compilare: main.cpp: In function 'int cmmdc(int, int, int&, int&)': main.cpp:17:9: warning: unused variable 'ans' [-Wunused-variable] int ans = cmmdc(b, a % b, x, y); ^~~ main.cpp: In function 'int main()': main.cpp:26:19: warning: variable 'ans' set but not used [-Wunused-but-set-variable] int n, m, x, y, ans; ^~~ main.cpp: In function 'int cmmdc(int, int, int&, int&)': main.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^