Compilare: user.cpp: In function ‘int main()’: user.cpp:8: warning: conversion lacks type at end of format user.cpp:8: warning: too many arguments for format user.cpp:18: warning: conversion lacks type at end of format user.cpp:18: warning: too many arguments for format user.cpp:5: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result