Compilare: user.c: In function ‘main’: user.c:18:2: warning: conversion lacks type at end of format [-Wformat=] scanf("%l", &t); ^ user.c:18:2: warning: too many arguments for format [-Wformat-extra-args] user.c:20:3: warning: conversion lacks type at end of format [-Wformat=] scanf("%l", "%l", a, b); ^ user.c:20:3: warning: too many arguments for format [-Wformat-extra-args] user.c:21:3: warning: unknown conversion type character 0xa in format [-Wformat=] printf("%l\n", euclid(a, b)); ^ user.c:21:3: warning: too many arguments for format [-Wformat-extra-args] user.c:11:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.in", "r", stdin); ^ user.c:12:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.out", "w", stdout); ^ user.c:18:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%l", &t); ^ user.c:20:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%l", "%l", a, b); ^ user.c:20:8: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.c:20:8: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized]