cstring2.h

C/C++程序设计导论（第二版）》程序源文件

// CString2.h   header file for String classs
//    version 3.2   Cannon, 1/23/98

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

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

class String
 {  public:	String();						// simple constructor
		String (const char []);					// literal constructor
		String operator= (const 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 (const String&);				// position of substring
		int operator== (const String&) const;
		int operator!= (const String&) const;		// Strings and literals...
		int operator<=	(const String&) const;
		int operator>= (const String&) const;
		int operator< (const String&) const;
		int operator> (const String&) const;
		String operator+ (const 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, const String& a);

// prototypes for comparison operators with literals on the left
 int operator== (const char *, const String&);
 int operator!= (const char *, const String&);
 int operator<= (const char *, const String&);
 int operator>= (const char *, const String&);
 int operator<  (const char *, const String&);
 int operator>  (const char *, const String&);