Lecture3code.txt

/*
 *  File: lecture.cpp
 *  ------------------
 * Snippets from the live coding part of Monday 1/14 lecture
 * showing some simple string manipulation.
 */

#include "genlib.h"
#include <iostream>

/* My first version takes string by value and creates
 * and returns a new string containing only the
 * non-matching characters, built up using
 * concatenation.
 */
string RemoveOccurrences1(char ch, string s)
{
	string result;
	for (int i = 0; i < s.length(); i++)
		if (s[i] != ch) result += s[i];
	return result;
}

/* My second version takes string by references
 * and edits it in-place to remove the characters
 * that match the target.
 */
void RemoveOccurrences2(char ch, string &s)
{
	int found = 0;
	while ((found = s.find(ch, found)) != string::npos)
		s.erase(found, 1);
}

int main()
{
	string myString = "chihuahuas cheese crackers";
	string without = RemoveOccurrences1('c', myString);
	RemoveOccurrences2('c', myString);
	cout << without << " " << myString << endl;
	return 0;
}