Modify Tokenstreamget to return Tokenprint when it sees a ne

Modify Token_stream::get() to return Token(print) when it sees a newline. This implies looking for whitespace characters and treating newline (\'\ \') specially. You might find the standard library function isspace(ch), which returns true if ch is a whitespace character, useful.

This is what I have so far, but I can\'t seem to figure out the errors

Token Token_stream::get(){
   if(full){
       full = false;
       return buffer; // buffer never gets deleted!
   }

   char ch;
   cin >> ch;
  
   switch(ch){
       case print :
       case \'=\' :
       case \'(\' :
       case \')\' :
       case \'{\' :
       case \'}\' :
       case \'+\' :
       case \'-\' :
       case \'*\' :
       case \'/\' :
       case \'%\' :
       return Token{ch};
       case \'.\' : case \'0\' : case \'1\' : case \'2\' : case \'3\' : case \'4\' :
       case \'5\' : case \'6\' : case \'7\' : case \'8\' : case \'9\' :
       {
           cin.putback(ch);
           double val;
           cin >> val;
           return Token{number, val};
       }
       default :
       if(isalpha(ch) || ch == \'_\'){
           string s;
           s+= ch;
           while(cin.get(ch) && (isalpha(ch) || isdigit(ch) || ch == \'_\'))
               s+=ch;
           cin.putback(ch);
//start keywords
           if(s == declkey) return Token (let);
           if(s == conskey) return Token (cons);
           if(s == helpkey) return Token (help);
           if(s == quitkey) return Token (quit);
//end keywords
           return Token{name, s}; // returns a name with type name
       }
       error(\"Invalid Token\");
   }
}

Solution

Please try below code. Let me know if your\'re facing further issue.

#include <iostream>

using namespace std;

int main()
{
cout << \"Hello World\" << endl;

return 0;
}

Token Token_stream::get(){
if(full){
full = false;
return buffer; // buffer never gets deleted!
}
char ch;
cin >> ch;
  
switch(ch){
case print :
case \'=\' :
case \'(\' :
case \')\' :
case \'{\' :
case \'}\' :
case \'+\' :
case \'-\' :
case \'*\' :
case \'/\' :
case \'%\' :
return Token{ch};
case \'.\' : case \'0\' : case \'1\' : case \'2\' : case \'3\' : case \'4\' :
case \'5\' : case \'6\' : case \'7\' : case \'8\' : case \'9\' :
{
cin.putback(ch);
double val;
cin >> val;
return Token{number, val};
}
default :
if(isalpha(ch) == 0 || ch == \'_\'){
string s;
s+= ch;
while(cin.get(ch) && (isalpha(ch) || isdigit(ch) || ch == \'_\'))
s+=ch;
cin.putback(ch);
//start keywords
if(s == declkey) return Token (let);
if(s == conskey) return Token (cons);
if(s == helpkey) return Token (help);
if(s == quitkey) return Token (quit);
//end keywords
return Token{name, s}; // returns a name with type name
}
error(\"Invalid Token\");
}
}