cstring.h

《C/C＋＋程序设计导论（第二版）》一书的程序源文件

// CString.h   header file for String classs

#ifndef _IOSTREAM_H
#include <iostream.h>
#endif

const char NULLC = '\0';
const int MAX = 80;

class String
 {  public:			String();							// simple constructor
			String (char []);					// literal constructor
			String operator= (String);				// assignment by String
		operator char* ();					// outward cast conversion
		int Atoi ();						// converts text to int
		float Atof ();						// converts text to float
		int Length ();						// returns length of string
		String Substr (int, int);					// substring copy
		int Contains (String);					// position of substring
		int operator== (String);
		int operator!= (String);					// Strings and literals...
		int operator<=	(String);
		int operator>= (String);
		int operator< (String);
		int operator> (String);
		String operator+ (String);					// concatenation
		char Onechar (int);					// return a single character
		void Onechar (int, char);					// replace a single character
		void InputStr (istream&);	   				// input function
		void OutputStr (ostream&);					// output function
	 private:			char cells[MAX];
 };

// prototypes for overloaded >> and << I/O operators
 istream& operator>> (istream& in, String& a);
 ostream& operator<< (ostream& out, String a);