c++ - Checking what type each character in a string is -


i have function i'm using try check whether string in correct format. i'm trying looking @ each character , determining if of correct type. no matter try error cannot figure out. code below:

bool valid(string checkcode) {     if(checkcode.length()!=6) return false;     else if(isalpha(checkcode.at(0)))&(isalpha(checkcode.at(1)))&(isdigit(checkcode.at(2)))&(isdigit(checkcode.at(3)))&(isalpha(checkcode.at(4)))&(isalpha(checkcode.at(5))) return true;     else return false; }

the error i'm getting @ first '&' , says "error: expression must ivalue or function designator" i'm stuck here, appreciated.

 isalpha(checkcode.at(0)))&(isalpha(checkcode.at(1)))                          //bit ,

should be

isalpha(checkcode.at(0)))&&(isalpha(checkcode.at(1)))                         //^^logical ,

you need use logical and in case.

you need make sure parentheses match.

//better format multiple conditions , make sure () match if(     (isalpha(checkcode.at(0)))   &&(isalpha(checkcode.at(1)))   &&(isdigit(checkcode.at(2)))   &&(isdigit(checkcode.at(3)))    &&(isalpha(checkcode.at(4)))   &&(isalpha(checkcode.at(5)))  )   return true;

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