Compilare: user.cpp: In function ‘int cauta(int)’: user.cpp:10:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:21:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(c); ^ /tmp/ccsoe3aU.o: In function `main': user.cpp:(.text.startup+0x1c): warning: the `gets' function is dangerous and should not be used.