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newbie: numeric to string conversion

Posted on 2002-03-06
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Last Modified: 2010-04-01
What is the best/accepted way to convert a numeric value (int, long, double, etc) into a string?

As a side note, is it possible to convert an unsigned char array into a string without "reinterpret_cast"ing it?  How?

Thanks
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Question by:slyph
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3 Comments
 
LVL 86

Accepted Solution

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jkr earned 400 total points
ID: 6844626
The most flexible way would 'sprintf()', e.g.

#define MAX_LEN 20
char acString [ MAX_LEN];

int i = 3;
double d = 3.141;

sprintf ( acString, "%d", i); // int
sprintf ( acString, "%f", d); // double

The pure C++ way is using a stringstream

#include <sstream>
using namespace std;

int i = 3;
double d = 3.141;
char* pszString;

stringstream ss;

ss << i;

pszString = ss.str().c_str();

or

ss << d;

pszString = ss.str().c_str();
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Expert Comment

by:yonat
ID: 6845079
You can also use a helper class like the stringizer I once wrote (http://ootips.org/yonat/4dev/stringizer.h).
Then you'll have a nicer syntax:
  string msg = "The int variable i is " + stringize(i) + ", and the float variable f is " + stringize(f);
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Author Comment

by:slyph
ID: 6845293
Perfect, thanks.
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