C++

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Int to string

joro550 (51)
Hey,
I've recently been learning some C# and it's been really helpful that every type has a .ToString() method inside their class and I was wondering if there was any equivalent in C++ apart from the string stream or itoa/atoi, I was thinking of creating a base class which has a method like this and making every type inherit from that one class but that would take a while!!

Thank you for any help given :D
Mathhead200 (1016)
overload the function
 
 
std::ostream& operator<<(std::ostream&, T);


Example:
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#include <iostream>
#include <string>

using namespace std;


class Person
{
  string name;

 public:
  Person() { name = "Person"; }
  Person(string n) { name = n; }

  string getName() { return name; }
};

ostream& operator<<(ostream &out, Person &p) {
  out << p.getName();
}


int main() {
  Person p1("Mathhead200"),
    p2("joro550");

  cout << p1 << endl
    << p2 << endl;

  return 0;
}
 
Mathhead200
joro550


You can also overload casting operators I believe...
Last edited on
Duthomhas (13206)
All the conversion stuff is in the stream classes... Use a stringstream for it

 
 
#incude <sstream> 
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int n = 42;
string s;
{ // convert int to string
  ostringstream ss( s );
  ss << n;
}

Hope this helps.
Janlan (90)
Try with atoi reference.
joro550 (51)
I'm sorry but did any of you even read my post?? I appreciate the answers given but my original post asked whether there is a way of changing an int to a string (or the other way around) WITHOUT using the atoi/itoa or stringstream
Moschops (7244)


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#include <iostream>

int main ()
{
  using std::cout;
  using std::cin;
  using std::endl;
  
  char outputString[4];
  outputString[3]=0;

  int temp;
  
  cout << "Enter an int up to three digits long" << endl;
  cin >> temp;
  
  int a = temp%10;
  outputString[2]=a+48;
  
  temp = temp - a;
  temp = temp/10;

  a = temp%10;
  outputString[1]=a+48;
  
  temp = temp - a;
  temp = temp/10;
  a = temp%10;
  outputString[0]=a+48;
  
  cout << outputString;
  
  return 0;
 }
Mathhead200 (1016)
Mathhead200
You can also overload casting operators I believe...
Athar (4466)
Boost's lexical_cast is often used for this. You can also define a VCL-style IntToStr specifically for ints in global namespace as a shortcut (which can just call lexical_cast<string>).
Duthomhas (13206)
I'm sorry but did any of you even read my post?? I appreciate the answers given but my original post asked whether there is a way of changing an int to a string (or the other way around) WITHOUT using the atoi/itoa or stringstream
I'm sorry I tried to give some help -- I didn't realize that it would be taken with such cheek.

C++ is not C#. If you want C#, then go use C#.

In C++, the toString() stuff is as I said:
All the conversion stuff is in the stream classes... Use a stringstream for it
Again, the streams design is how C++ does toString(). In conclusion, if you want to do toString() stuff, use the STL streams classes.

You are wasting your time any other way.
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