Compilare: main.c: In function 'main': main.c:8:16: warning: conversion lacks type at end of format [-Wformat=] fscanf(i, "%ll", &p); ^ main.c:8:13: warning: too many arguments for format [-Wformat-extra-args] fscanf(i, "%ll", &p); ^~~~~ main.c:17:17: warning: conversion lacks type at end of format [-Wformat=] fprintf(o, "%ll", r); ^ main.c:17:14: warning: too many arguments for format [-Wformat-extra-args] fprintf(o, "%ll", r); ^~~~~ main.c:8:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(i, "%ll", &p); ^~~~~~~~~~~~~~~~~~~~