string与double的互相转换

转自 http://blog.csdn.net/codeeer/article/details/8907470

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1. #include <iostream>  
2. #include <string>  
3. #include <sstream>  

double转string

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1. string DoubleToString(double Input)  
2. {  
3.     stringstream Oss;  
4.     Oss<<Input;  
5.     return Oss.str();  
6. }  

string转double

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1. double StringToDouble(string Input)  
2. {  
3.     double Result;  
4.     stringstream Oss;  
5.     Oss<<Input;  
6.     Oss>>Result;  
7.     return Result;  
8. }  

Demo：

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1. int main()  
2. {  
3.     double Str_1 = 12345.56789;  
4.     string Str_2 = "12345.56789";  
5.   
6.     cout<<"Double --> String"<<endl;  
7.     cout<<DoubleToString(Str_1)<<endl;  
8.   
9.     cout<<"String --> Double"<<endl;  
10.     cout<<StringToDouble(Str_2)<<endl;  
11.   
12.     system("pause");  
13. }  

效果图：