C++中int型与string型互相转换

	 

	像是C#,java等高级语言中,int转String类型都是很简单的,但是C++中比较麻烦：

	 

	 int 转换string

	 

	 

	 string int2str( int num)

	 {

	    if (num == 0 )

	       return " 0 " ;                                                                                                                                      

	  

	    string str = "" ;

	    int num_ = num > 0 ? num : - 1 * num;

	 

	    while (num_)

	    {

	       str = ( char )(num_ % 10 + 48 ) + str;

	       num_ /= 10 ;

	    }

	 

	    if (num < 0 )

	       str = " - " + str;

	 

	    return str;

	}

	string 转换int

	 

	 

	 int str2int( string str)

	 {

	    int i,len = str.size(),num = 0 ;

	 

	    i = 0 ;  

	    if (str[ 0 ] == ' - ' )

	       i = 1 ;

	  

	    while (i < len)

	    {

	       num = num * 10 + ( int )(str[i] - ' 0 ' );

	       i ++ ;                                                                                                                                               

	    }

	 

	    if (str[ 0 ] == ' - ' )

	       num *= - 1 ;

	 

	    return num;

	}

补充：软件开发 , C++ ,

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