Compilare: user.cpp: In function ‘int main()’: user.cpp:91:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S); ^ user.cpp:92:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &n); ^ user.cpp:93:13: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(CH); ^ /tmp/ccyQ0PsN.o: In function `main': user.cpp:(.text.startup+0x1b): warning: the `gets' function is dangerous and should not be used.