處理檔案資料，最常使用char[]或string來儲存字串，前者是字元陣列，為C所擁有，當然C++也可以使用；而後者是C++獨有的字串類別，可以產生字串物件。
在使用C++處理字串時，時常會char[]和string互轉，來符合接下來要使用的函式中參數的型態，假如可以互轉自如，那麼處理起檔案資料會更簡單便利喔！
我測試的程式碼如下：
/**
Theme: string & char[] transform
Compiler: Dev C++ 4.9.9.2
Date: 100/05/01
Author: ShengWen
Blog: https://cg2010studio.wordpress.com/
*/
#include<iostream>
using namespace std;
int main(){
string test_string="test_string";
char test_char[]="test_char", result_char[20];
string result_string1(test_char);
string result_string2;
result_string2.assign(test_char);
strcpy(result_char, test_string.c_str());
cout<<"test_string: "<<test_string<<endl;
cout<<"test_char: "<<test_char<<endl;
cout<<"result_string1: "<<result_string1<<endl;
cout<<"result_string2: "<<result_string2<<endl;
cout<<"result_char: "<<result_char<<endl;
system("pause");
return EXIT_SUCCESS;
}
程式結果為：
test_string: test_string
test_char: test_char
result_string1: test_char
result_string2: test_char
result_char: test_string
請按任意鍵繼續 . . .
可見到string轉char[]相當簡單，只要呼叫string class的成員函式c_str()，即可將string轉為char[]。
那麼char[]轉string呢？有兩種方法，第一種是初始string變數時，即把char[]當作參數來初始化，第二種則是使用string class的成員函式assign(char[])來將char[]指定為string變數。
逍遙文工作室 
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