Compilare: main.c: In function 'read_int': main.c:16:4: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, in); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:27:4: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, in); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'main': main.c:44:2: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, input_file); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~