Compilare: user.cpp: In function ‘int main()’: user.cpp:30:9: warning: unused variable ‘x’ [-Wunused-variable] int x=divide(); ^ user.cpp:19:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.in","r",stdin); ^ user.cpp:20:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.out","w",stdout); ^ user.cpp:21:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%c",&t,&c); ^ user.cpp:26:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccCIDFKE.o: In function `main': user.cpp:(.text.startup+0xa8): warning: the `gets' function is dangerous and should not be used.