ceil

     double ceil(double);

rounding up floating point

#include <iostream> /* including standard library */
#include <cmath> /* including math library */
 
using namespace std;
int main ( void )
{
  double res = 0;
  res = ceil (4.2);
 
  //cout.setf(ios::fixed, ios::floatfield);
  cout.precision(8);
 
  cout << "ceil from 4.2 is " << res << endl;
  return 0;
}

  ceil from 4.2 is 5