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How could I convert integer to string?

Posted on 2011-03-02
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Last Modified: 2012-05-11
Dear,

What is the function used to convert integer to string in C/C++?

currently, in delphi we have inttostr function.

Nabil.
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Question by:nabilhammoud
6 Comments
 
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Expert Comment

by:AndyAinscow
ID: 35024590
itoa and ltoa (and variants for wide strings).
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evilrix earned 125 total points
ID: 35024710
EE's very own DanRollins has written a good article on this very subject...

"Convert String to int / Convert int to String in C++"
http://www.experts-exchange.com/Programming/Languages/CPP/A_1577-Convert-String-to-int-Convert-int-to-String-in-C.html
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Assisted Solution

by:phoffric
phoffric earned 125 total points
ID: 35024718
itoa may or may not be part of your system as it is not in the standard library. If you wish to do this in C++, here is an example that shows how to do it.
      http://www.cplusplus.com/reference/iostream/istringstream/istringstream/
// using istringstream constructors.
#include <iostream>
#include <sstream>
#include <string>
using namespace std;

int main () {

  int n,val;
  string stringvalues;

  stringvalues = "125 320 512 750 333";
  istringstream iss (stringvalues,istringstream::in);

  for (n=0; n<5; n++)
  {
    iss >> val;
    cout << val*2 << endl;
  }

  return 0;
}

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Expert Comment

by:sarabande
ID: 35025725
the sample phoffric provided converts string to integer. you need to use ostringstream for the reverse conversion:

   std::ostringstream oss;
   int i = 12345;
   oss << i;
   std::string si = oss.str();

if you need char array the last statement turns to

  const char * pcs = oss.str().c_str();

Sara
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Expert Comment

by:tomnov
ID: 35025776
int val = 10;
char buff[10];
int radix = 10;

itoa(val, buff, radix);

printf("value: %s\n", buff);

//prints value: 10
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Author Closing Comment

by:nabilhammoud
ID: 35025910
THX
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