C + + int to string (StringStream can go more types)

first, the use of AtoiDescription

itoa (int value, char *string, int radix);
The first parameter: the int you want to convert;
The second parameter: char* after conversion;
The third parameter: the binary you want to convert;

Example:

1 //-------------------------------------2 //function: C + + int to string (using Atoi)3 //Environment: VS20054 //-------------------------------------5#include"stdafx.h"6#include <iostream>7 using namespacestd;8 intMainintargcChar*argv[])9 {Ten     intn = -; One     Charc[Ten]; AItoa (n, C,2); -cout <<"2->"<< C <<Endl; -Itoa (n, C,Ten); thecout <<"16->"<< C <<Endl; -Itoa (n, C, -); -cout <<"10->"<< C <<Endl; -System"Pause"); +     return 0; -}

Output:

2-> 11110

16-> 30

10-> 1e

second, the use of sprintf

Header file #include <stdio.h>

Syntax: int sprintf (string format, mixed [args] ...);

return value: String Length (strlen)

Convert characters

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% printed percent symbol, not converted.

b integer turns into binary.

The c integer is converted to the corresponding ASCII character.

D integers are turned into 10.

The F-Times precision number is converted to floating point numbers.

o integers are turned into octal.

The s integer is converted into a string.

The x integer is converted to lowercase 16 rounding.

X integers are converted to uppercase 16 rounding.

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Example:

1 //-------------------------------------2 //function: C + + int to string (using sprintf)3 //Environment: VS20054 //-------------------------------------5#include"stdafx.h"6#include <iostream>7#include <string>8 using namespacestd;9 intMain ()Ten { One     intn = -; A     Charc[ -]; -sprintf (c,"%d", n); -cout << C <<Endl; thesprintf (c,"%o", n); -cout << C <<Endl; -sprintf (c,"%x", n); -cout << C <<Endl; +sprintf (c,"%c", n); -cout << C <<Endl; +     floatf =24.678; Asprintf (c,"%f", f); atcout << C <<Endl; -sprintf (c,"%.2f", f); -cout << C <<Endl; -sprintf (c,"%d-%.2f", N, f); -cout << C <<Endl; -System"Pause"); in     return 0; -}

Output:

30

36

1e//Note: Here is a special symbol

24.677999

24.68

30-24.68

third, the use of StringStream

Generic template (int,double,char[], recommended by Linux under compilation):

/*convert other data to Stringusage:     string str = m_tostr<int> (12345); */template <class t> string m_tostr (T tmp) {    StringStream ss;    SS << tmp;    return Ss.str ();}

　　

Other examples:

-------------------------------------//function: C + + int to string (using StringStream)//environment: vs2005//------------------------ -------------#include "stdafx.h" #include <iostream> #include <string> #include <sstream>using namespace Std;int Main () {    stringstream strstream;    int a = +;    float f = 23.5566;    Strstream << a << "----" << F;    string s = Strstream.str ();    cout << s << endl;    System ("pause");    return 0;}

Output:

----23.5566

Iv. Other

1.SPRINTF can cause buffer overflow, consider using snprintf or nonstandard asprintf

2. If it is an MFC program, you can use Cstring::format

3. If you use boost, you can use it directly: string s = Boost::lexical_cast <string> (a);

4.atoi is also non-portable.

V. Other NB Methods

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Reference:

Http://baike.baidu.com/view/982195.htm?fr=ala0_1_1

Http://baike.baidu.com/view/1295144.htm?fr=ala0_1

http://pppboy.blog.163.com/blog/static/3020379620085511954382/

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