Compilare: user.cpp: In function 'int main()': user.cpp:9: warning: conversion lacks type at end of format user.cpp:9: warning: too many arguments for format user.cpp:11: warning: conversion lacks type at end of format user.cpp:11: warning: too many arguments for format user.cpp:13: warning: unknown conversion type character 0xa in format user.cpp:13: warning: too many arguments for format