Code::Blocks - Linux - prints “Hello World” even though it isn't in the “main.cpp” file

Question

I have recently started a few projects to help me learn C++, I am creating a program that allows the user to enter a grade score /100, the code is as follows:

#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;

int main (gradeScore)
{
    int gradeScore
    cout << "Enter your grade score out of 100"
    cin >> gradeScore

    if (gradeScore == 100)
    {
        cout << "Well done! You have achieved a perfect score!.."
    {
}

I tried compiling it just to make sure that it was working so far, however, it opens up the terminal and prints

Hello World! 

Process returned 0 (0x0)    execution time : 0.013 s
Press ENTER to continue.

I'm not sure what to do about it, there's nowhere in the project that contains the string "Hello World" anywhere. Could someone please help me? I just want to be able to carry on my learning without and hinderance like this.

I'm using Code::Blocks 13.12 rev 9501 (2013-12-25 18:25:45) gcc 4.8.2 Linux/unicode - 32 bit (not sure if this is helpful)

Thanks guys.

Answer 1

I'd like to thank you for your advice and help, I'm sure it's frustrating seeing questions like this all the time off us noobs.

I have solved the problem and it turns out the solution was stupidly easy: I deleted the project, made a new one, opened the main.cpp file and found this cheeky little bugger sitting on the file:

#include <iostream>
using namespace std; 

int main()
{
    cout << "Hello World!" <<endl;
}

I deleted it and corrected my original program to this:

#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;

int main()
{
    int gradeScore;
    cout << "Input test score out of 100:";
    cin >> gradeScore;

    if (gradeScore == 100)
    {
        cout << "Congratulations! You achieved a perfect score" << endl; 
    {
}

Again, thank you for your patience guys! I promise I'm trying hahaha!