c++ - The left parenthesis '(' found at 'foo.cpp' was not matched correctly -

location of error indicated in comment below. please fix this.

#include<iostream.h> #include<string.h> #include<stdlib.h> class string { private:     enum{sz=80};     char str[sz]; public:     string()     {         strcpy(str,"");     }      string (char s[])     {         strcpy(str,s);     }      void display() const     {         cout<<str;     }     string operator +(string ss) const     {         string temp;         if(strlen(str) + (strlen(ss.str) < sz)         {             strcpy(temp.str,str);             strcat(temp.str , ss.str);         } // error reported here!         else         {             cout<<"\nstring overflow";             exit(1);         }         return temp;     }  }; int main() {     string s1="\nmerry christmas";     string s2="happy new year";     string s3;      s1.display();     s2.display();     s3.display();      s3=s1+s2;     s3.display();     cout<<endl;     return 0; } 

the error occurs here:

if(strlen(str) + (strlen(ss.str) < sz) 

that should be:

if (strlen(str) + strlen(ss.str) < sz)