program to change precision of different floating numbers

#include<iostream.h>
#include<conio.h>
#include<iomanip.h>
#include<process.h>
void main()
{
    float x,y,z,t;
    clrscr();
    x=5.643678878;
    y=75.89;
    z=17.6E3;
    t=-3456.780;
    cout<<"\nall floating point values are:\n";
    cout<<"\nx is : "<<x;
    cout<<"\ny is : "<<y;
    cout<<"\nz is : "<<z;
    cout<<"\nt is : "<<t;
    getch();
    clrscr();
    cout.setf(ios::showpoint);
    cout<<"\nfixed notation";
    cout<<"\nx is "<<x;
    cout<<"\ny is "<<y;
    cout<<"\nz is "<<z;
    cout<<"\nt is "<<t;
    getch();
    cout.precision(2);
    cout<<"\nx is "<<x;
    cout.precision(3);
    cout<<"\ny is "<<y;
    cout.precision(7);
    cout<<"\nz is "<<z;
    cout<<"\nt is "<<t;
    getch();
}