Compilare: main.c: In function 'main': main.c:9:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &a ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &b ); ^~~~~~~~~~~~~~~~~~~~~~~ main.c:28:5: warning: 'pstart' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf( fout, "%d %d %d", total, pstart + 1, pend + 1 ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~