Main.cc: In function 'int main()': Main.cc:5:19: error: expected unqualified-id before ';' token int a,b,c,d,e,; ^ Main.cc:6:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%1d%1d%1d%1d%1d",&a,&b,&c,&d,&e); ^