c 2b 2b code

1help me i dont now what the freak am doing any more

1// Your First C++ Program
2
3#include <iostream>
4
5int main() {
6    std::cout << "Hello World!";
7    return 0;
8}
9

1#include <iostream>
2#include<conio.h> /* For getch() only */
3using namespace std;
4int main () {
5   int num = 10;
6            if (num % 2 == 0)
7            {
8                cout<<"It is an even number";
9            }
10getch();  /* getch is the function of conio.h */
11}

1#include<bits/stdc++.h>
2using namespace std;
3int
4main ()
5{
6  string s1, s2;
7  cin >> s1 >> s2;
8  cout << s1.size () << " " << s2.size () << endl;
9  cout << s1 << s2 << endl;
10  char temp;
11  temp = s1[0];
12  s1[0] = s2[0];
13  s2[0] = temp;
14  cout << s1 << " " << s2 << endl;
15}

1#include <bits/stdc++.h>
2using namespace std;
3
4long int getSumOfFactors(int n)
5{
6    long int temp = 0;
7    for (int i=1;i<=n;i++){
8        if (n%i==0) temp = temp+i;
9    }
10    return temp;
11}
12
13int main()
14{
15    int n;
16
17    cout<<"Input the number : ";
18    cin>>n;
19
20    long int result = getSumOfFactors(n);
21
22    cout<<"\nThe Summation of the all the factors of the number is : "<<result;
23
24}

1#include <iostrea>