C/C++並沒有提供內建的int轉string函數,這裡提供幾個方式達到這個需求。
1.若用C語言,且想將int轉char *,可用sprintf(),sprintf()可用類似printf()參數轉型。
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/*
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(C) OOMusou 2007 http://oomusou.cnblogs.com
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Filename : int2str_sprintf.cpp
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Compiler : Visual C++ 8.0 / ANSI C
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Description : Demo the how to convert int to const char *
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Release : 01/06/2007 1.0
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*/
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#include "stdio.h"
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void int2str(int , char *);
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int main() {
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int i = 123;
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char s[64];
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int2str(i, s);
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puts(s);
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}
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void int2str(int i, char *s) {
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sprintf(s,"%d",i);
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}
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2.若用C語言,還有另外一個寫法,使用_itoa(),Microsoft將這個function擴充成好幾個版本,可參考MSDN Library。
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/*
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(C) OOMusou 2007 http://oomusou.cnblogs.com
3![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Filename : int2str_itoa.cpp
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Compiler : Visual C++ 8.0 / ANSI C
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Description : Demo the how to convert int to const char *
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Release : 01/06/2007 1.0
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*/
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#include "stdio.h" // puts()
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#include "stdlib.h" // _itoa()
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void int2str(int , char *);
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int main() {
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int i = 123;
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char s[64];
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int2str(i, s);
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puts(s);
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}
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void int2str(int i, char *s) {
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_itoa(i, s, 10);
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}
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3.若用C++,stringstream是個很好用的東西,stringstream無論是<<或>>,都會自動轉型,要做各型別間的轉換,stringstream是個很好的媒介。
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/*
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(C) OOMusou 2007 http://oomusou.cnblogs.com
3![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Filename : int2str_sstream.cpp
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Compiler : Visual C++ 8.0 / ISO C++
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Description : Demo the how to convert int to string
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Release : 01/06/2007 1.0
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*/
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#include <iostream>
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#include <string>
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#include <sstream>
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using namespace std;
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string int2str(int &);
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int main(void) {
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int i = 123;
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string s;
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s = int2str(i);
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cout << s << endl;
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}
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string int2str(int &i) {
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string s;
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stringstream ss(s);
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ss << i;
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return ss.str();
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}
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4.若用C++,據稱boost有更好的方法,不過我還沒有裝boost,所以無從測試