how to print in c++

#include <iostream>
using namespace std;

int main() {
  cout << "Hello World!";
  return 0;
} 

#include <iostream>

int main() {
  std::cout << "Hello, World!"; // prints 'Hello, World!' to the output.
  return 0;
}

#include <iostream>
using namespace std;

int main(){
  cout<<"Hello World!"<< endl; // prints "Hello World"
  return 0;
}

#include <cstdio>

int main()
{
    char ch = 'a';
    float a = 5.0, b = 3.0;
    int x = 10;

    printf("%.3f / %.3f = %.3f \n", a,b,a/b);
    printf("Setting width %*c \n",5,ch);
    printf("Octal equivalent of %d is %o \n",x,x);

    return 0;
}

  #include <iostream>
using namespace std;

int main() {
  
  cout << "Hello World!";
  return 0;
} 

#include <iostream>

int main() {
  std::cout << "Hello World!"; //cout keyword prints "Hello World!"
  return 0;
}

#include <iostream>
std::cout << someString << "\n";

cout << "hello world"