pad the field width with spaces and set the internal and showpos flags : float output « Data Types « C++ Tutorial

1. C++ Tutorial
2. Data Types
3. float output

#include <iostream>

using namespace std;

int main()
{
  cout << "Hello" << endl;

  cout.width(12);
  cout.fill(' ');
  cout.setf(ios::showpos | ios::internal);
  cout << 765.34 << endl;

  return 0;
}