Compilare: user.c: In function 'main': user.c:7: warning: conversion lacks type at end of format user.c:7: warning: too many arguments for format user.c:9: warning: unknown conversion type character 0x20 in format user.c:9: warning: unknown conversion type character 0x20 in format user.c:9: warning: conversion lacks type at end of format user.c:9: warning: too many arguments for format user.c:20: warning: unknown conversion type character 0x20 in format user.c:20: warning: too many arguments for format