A simple replace example written in C++. Plus... fancy error control!

replace.cpp

#include <iostream>
#include <string>

using namespace std;

// declare main function with argv abilities
int main(int argc, char* argv[]) {
	// first string
	string statement;

	// to make a variable is nil error look cleaner
	if (argv[1] != false) {
		// if first arg exists... make it the statement variable
		statement = argv[1];
	}
	else {
		// if first arg doesn't exist... show this error instead
		cout << "Please add command line arg.";
	}

	// replace string
	string replace_statement = " there!";
	// find string in statement variable
	size_t lookfor_bash = statement.find('!');

	// if the string we're looking for exists...
	if (lookfor_bash != string::npos) {
		// redefine statement variable with replace strings
		statement = statement.replace(/* strings to replace */lookfor_bash, /* replace this many chars */replace_statement.length(), /* replace with this string */replace_statement);	
	}
	
	cout << statement << endl;
}