pex8_8.cpp

来自「数据结构C++代码,经典代码,受益多多,希望大家多多支持」· C++ 代码 · 共 69 行

#include <iostream.h>
#pragma hdrstop

#include "strclass.h"

// replace repstr.Length() chars in source starting at index pos
void Replace(String& source, int pos, const String& repstr)
{
	// remove repstr.Length() chars from source beginning
	// at index pos. if fewer than repstr.Length() chars
	// exist in the tail of source, delete entire tail
	source.Remove(pos, repstr.Length());
	// insert repstr into source at index pos.
	// if source.Length() = pos, append repstr to source
    source.Insert(repstr, pos);
}

// print S centered in a line of 80 '%' characters
void Center (String& S)
{
	String line;
	int startS;
	
	// create line = "%%%...%%%"
	for(int i=0;i < 80;i++)
		line += "%";

	// compute starting index of S
	startS = (80 - S.Length())/2;
	// replace S.Length() '%' chars beginning at index startS
	Replace(line,startS,S);
	// output the line
	cout << line << endl;
}

void main(void)
{
	// testing strings
	String S("SourceString"), T("123"), U;
	
	U = S;
	// replace at beginning of U
	Replace(U,0,T);
	cout << "1st example:  " << U << endl;
	
	// replace inside U
	U = S;
	Replace(U,6,T);
	cout << "2nd example:  " << U << endl;
	
	// replacement lengthens U
	U = S;
	Replace(U,11,T);
	cout << "3rd example:  " << U << endl;

	Center(S);
}

/*
<Run>

1st example:  123rceString
2nd example:  Source123ing
3rd example:  SourceStrin123
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%SourceString%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*/