CPP

c++ round number down

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	double num1 = 4.8;
  	double num2 = 4.3;
  	cout << floor(num1) << endl; // --> 4
  	cout << floor(num2) << endl; // --> 4
}

c++ round number to whole

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	double num1 = 4.8;
  	double num2 = 4.3;
  	cout << round(num1) << endl; // --> 5
  	cout << round(num2) << endl; // --> 4
}

c++ round number up

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	double num1 = 4.8;
  	double num2 = 4.3;
  	cout << ceil(num1) << endl; // --> 5
  	cout << ceil(num2) << endl; // --> 5
}

c++ round to whole number

#include <iostream>
#include <cmath>
using namespace std;

int main() {

  // display integral value closest to 15.5
  cout << round(15.5);

  return 0;
}

// Output: 16