formating display

hi i need to display a floating point variable with two deciaml places. my problem is that when my answer is say 45.50 the zero does not show. how can i get the zero to show.

Code:

#include <iostream.h>
#include <iomanip.h>               
#include <math.h>                 
int main()
{
    float lenght, width, height, paintcost, gallonsneeded, area, cost;
    
    lenght = 20;
    height = 8;
    width = 12;
    paintcost = 22.75;
    area = 2*(lenght*height) + 2*(width*height) + (lenght*width);
    gallonsneeded = area/440;
    gallonsneeded = ceil(gallonsneeded);    
    cost = gallonsneeded * 22.75;         
    cout << " Gallons of paint needed will be  " << gallonsneeded << endl;
    cout << " Total painting coast will be    "  << setprecision(4) << cost << endl;
    system("pause");
    return 0;
}

Code:

cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2);

Where 2 = how many places after decimal. Once declared it will effect all until changed again. If you wish to change it again, you only need to do cout.precision(#);

do i need to include a new header for this to work

forget my last messge it works thanks