Messing with strings...

#include <iostream>
#include <stdio.h>
#include <cstring>

using namespace std;

char Buffer[240] = "Hello World!";
#define Oops "This program was made by %s. Not emokid at all. Hell no. I %s did this!"

void main()
{
    char Name [124];
    cout << Buffer;
    cout << endl << "Please insert you name: ";
    cin >> Name;

    char *pch;
    pch = strstr(Buffer,"World");
    strncpy(pch,Name,sizeof(Name)-1);
    cout << endl << Buffer;

    sprintf(Buffer, Oops, Name,Name);
    cout << endl << Buffer << endl;
}