Simple calculator in C++

#include <iostream>
using namespace std;
int main()
{
    // One and two are the numbers the user selects
    double one, two;
   
    cout << "Please input the first number:"; // C-out GIVES YOU information (information comes out of computer)
    cin >> one; // Cin takes the users first number, and assosicates it to one // C-IN takes information to the computer ( you put info in comp)
    cout << "Please input the second number:";
    cin >> two; // Here cin takes the second number and assisgns it to two
    cout << "\nThe answers are:\nAddition:" << one + two; // All the math happens here
    cout << "\nSubtraction:" << one - two;
    cout << "\nMultiplication:" << one * two;
    cout << "\nDivision:" << one / two;
    cout << "\nCALCULATE SOME MORE PLZZZ SUMS ARE MY DRUGGGG.";
    cout << "\n";
    main(); // This starts the main function again, so you can do another calculation
   
    return 0; // return zero, means ur progam ran succesfully from top to the line with return 0;
}

#include <iostream>
using namespace std;
int main()
{
    // One and two are the numbers the user selects
    double one, two;
   
for (int i = 0; i < 6; ++i) //Begins the loop. Will keep running while i is less than 6.
{
    cout << "Please input the first number:"; // C-out GIVES YOU information (information comes out of computer)
    cin >> one; // Cin takes the users first number, and assosicates it to one // C-IN takes information to the computer ( you put info in comp)
    cout << "Please input the second number:";
    cin >> two; // Here cin takes the second number and assisgns it to two
    cout << "\nThe answers are:\nAddition:" << one + two; // All the math happens here
    cout << "\nSubtraction:" << one - two;
    cout << "\nMultiplication:" << one * two;
    cout << "\nDivision:" << one / two;
    cout << "\nCALCULATE SOME MORE PLZZZ SUMS ARE MY DRUGGGG.";
    cout << "\n";
}
    return 0; // return zero, means ur progam ran succesfully from top to the line with return 0;
}

using namespace std;

std::cout << "here you go\n";

using namespace example;

using namespace std;
using namespace example;

example::string;
//Well, std also has a string class.
std::string;

string SzString = "Hello world";

using std::cout;
using std::cin;
using std::endl;
using example::string;
using example::bin;

using std::cout;

#include <windows.h>
#include <iostream>
#include <vector>
usint std::cout;
using std::cin;
using std::vector;
DWORD WINAPI hThread(LPVOID)
{
cout << "Running this thread simultaneously\n";
}
int main()
{
DWORD dwThreadID;
HANDLE hHandle = CreateThread(NULL,NULL,hThread,NULL,dwThreadID);
int x;
vector<int> vArray;
while(int i !=10)
{
cin >> x;
vArray.push_back(x);
++i;
}
vArray.clear();
return 0;
}

using std::cout;
using std::cin;

#include <windows.h>
#include <iostream>
#include <vector>
using std::cout;
using std::cin;
using std::vector;
DWORD WINAPI hThread(LPVOID)
{
cout << "Running this thread simultaneously\n";
return 0;
}
int main()
{
DWORD dwThreadID;
HANDLE hHandle = CreateThread(NULL,NULL,hThread,NULL,NULL,&dwThreadID);
int x;
vector<int> vArray;
int i;
cout << "Enter 10 numbers->";
while(i < 10)
{
cin >> x;
vArray.push_back(x);
++i;
}
vector<int>::iterator Display;
cout << "Your vector contains ";
for (Display = vArray.begin(); Display<vArray.end();++Display)
{
   cout << " " << *Display;
}
vArray.clear();
return 0;
}

#include <iostream>
#include <cmath>
using std::cout;
using std::cin;
using namespace std;

int main()
{

float a;
float b;
int chosen;
float sum;
int loopieloop;

while(loopieloop <= 50){
cout  << "What kind of calculation u wanna do" << endl;
cout  << "Put number one if u wanna do PLUS" << endl;
cout  << "Put TWO if u wanna do minus" << endl;
cout  << "Put THREE if u wanna do Multiplication" << endl;
cout  << "put five if u wanna do Division YEAH I GOOGLED THAT WORD JAJA" << endl;
cin >> chosen;
// ok so.... now i make a if statement right?
if(chosen==1){
cout << "Giv me a number!" << endl;
cin >> a;
cout << "Giv me a number again!" << endl;
cin >> b;
sum = a+b;
cout << "that gives you" << sum << endl; // i hope this is right
loopieloop++;
}
if(chosen==2){
cout << "Giv me a number!" << endl;
cin >> a;
cout << "Giv me a number again!" << endl;
cin >> b;
sum = a-b;
cout << "that gives you" << sum << endl; // i hope this is right
loopieloop++;
}
if(chosen==3){
cout << "Giv me a number!" << endl;
cin >> a;
cout << "Giv me a number again!" << endl;
cin >> b;
sum = a*b;
cout << "that gives you" << sum << endl; // i hope this is right
loopieloop++;
}
if(chosen==4){
cout << "Giv me a number!" << endl;
cin >> a;
cout << "Giv me a number again!" << endl;
cin >> b;
sum = a/b;
cout << "that gives you" << sum << endl; // i hope this is right
loopieloop++;
}
}
}
}

using std::cout;
using std::cin;