spioni.cpp: In function 'void verifica(int, int)': spioni.cpp:17: warning: unused variable 'z' spioni.cpp: In function 'int main()': spioni.cpp:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result spioni.cpp:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result spioni.cpp:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result spioni.cpp:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result spioni.cpp:56: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result spioni.cpp:57: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccsfDEd8.o: In function `main': spioni.cpp:(.text+0x529): warning: the `gets' function is dangerous and should not be used.