Compilare: user.cpp: In function ‘void check(int, int)’: user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int give(int, int)’: user.cpp:32: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void read()’: user.cpp:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:46: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccZrZZNL.o: In function `read()': user.cpp:(.text+0x3ca): warning: the `gets' function is dangerous and should not be used.