Compilare: user.cpp: In function ‘int main()’: user.cpp:152: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:153: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:154: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘long int pval()’: user.cpp:60: warning: ‘nr’ may be used uninitialized in this function /tmp/ccVkjkaV.o: In function `main': user.cpp:(.text+0x5e3): warning: the `gets' function is dangerous and should not be used.