Compilare: user.cpp: In function ‘int main()’: user.cpp:9:15: warning: variable ‘sol’ set but not used [-Wunused-but-set-variable] int a, b, sol, x, y; ^ user.cpp: In function ‘int euclid(int, int, int&, int&)’: user.cpp:22:9: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int d, x0, y0; ^ user.cpp: In function ‘int main()’: user.cpp:7:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.in","r",stdin); ^ user.cpp:8:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.out","w",stdout); ^ user.cpp:10:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp: In function ‘int euclid(int, int, int&, int&)’: user.cpp:27:1: warning: control reaches end of non-void function [-Wreturn-type] } ^