Compilare: user.c: In function ‘main’: user.c:20:13: warning: implicit declaration of function ‘isdigit’ [-Wimplicit-function-declaration] if(isdigit(buf[q])) ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%i", &n); ^ user.c:17:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s\n", buf); ^