Compilare: user.c: In function ‘main’: user.c:36: warning: conversion lacks type at end of format user.c:36: warning: too many arguments for format user.c:37: warning: conversion lacks type at end of format user.c:37: warning: conversion lacks type at end of format user.c:37: warning: too many arguments for format user.c:40: warning: conversion lacks type at end of format user.c:40: warning: too many arguments for format user.c:34: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:35: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:36: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:37: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result