Compilare: user.cpp: In function ‘int check(int)’: user.cpp:52:17: warning: unused variable ‘maxFirstVal’ [-Wunused-variable] int maxFirstVal = minFirstVal + (1 << unusedBits) - 1; ^ user.cpp:73:17: warning: unused variable ‘maxBefore’ [-Wunused-variable] int maxBefore = before + (((1 << unusedBits) - 1) << start); ^ user.cpp:35:23: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ret = false, ok; ^ user.cpp: In function ‘int main()’: user.cpp:91:13: warning: unused variable ‘ok’ [-Wunused-variable] int ok = check(i); ^ user.cpp: In function ‘void readData()’: user.cpp:20:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(text); ^ /tmp/ccffrlJR.o: In function `readData()': user.cpp:(.text+0x13): warning: the `gets' function is dangerous and should not be used.