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Here, stream can be any stream you want to affect The following program turns on both the showpos and scientific flags for cout:

Move each control by clicking it and dragging it around the form. You can also click and drag a control s corners or edges to resize the control.

#include <iostream> using namespace std; int main() { coutsetf(ios::showpos); coutsetf(ios::scientific); cout << 123 << " " << 12323 << " "; return 0; }

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You can OR together as many flags as you like in a single call For example, you can change the program so that only one call is made to setf( ) by ORing together scientific and showpos, as shown here

Our controls are now on the form. Each control is named based on the type of control. The Button is called button1, while the PictureBox is called pictureBox1. Visual Studio .NET automatically creates a name for each new control based on the class name followed by a number. A second Button object added to the form would be called button2, and so forth. As for the Form1 class earlier in this chapter, we would prefer more descriptive names for our controls, so we rename these items in the following table. In addition, we need to set the properties for our controls similar to the settings in chapter 1. Since we have set our control s position and size graphically, there is no need to assign the positional properties such as Left and Height here. In chapter 1, we also set the Text property of the button to &Load and the BorderStyle property of the PictureBox control to Fixed3D. Visual Studio provides a special Properties window where the properties and name of a control can be viewed and modified. We can use these to update our controls. We will set the Button properties first by continuing our previous steps.

coutsetf(ios::scientific | ios::showpos);

RENAME THE CONTROLS AND DEFINE THEIR PROPERTIES Action 7 Display the properties for the Button control.

To turn off a flag, use the unsetf( ) function Its prototype is shown here: void unsetf(fmtflags flags); It turns off those flags specified by flags Sometimes it is useful to know the current flag settings You can retrieve the current flag values using this form of the flags( ) function: fmtflags flags( );

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a. Right-click the Button control to display a list of options. b. Select the Properties item. c. If the controls are not shown alphabetically, click the A-Z button of the Properties window. 8 Rename the control from button1 to btnLoad.

This function returns the current value of the flags associated with the invoking stream The following form of flags( ) sets the flag values to those specified by flags and returns the previous flag values: fmtflags flags(fmtflags flags);

To see how flags( ) and unsetf( ) work, examine this program It includes a function called showflags( ) that displays the state of the flags

Note: On your PC, the Properties window may appear below or to the right of the main window. You can move it by dragging its tab, located below the window, to a new location. I prefer this window on the right side of Visual Studio .NET to allow a longer list of properties to be displayed. We will always display properties alphabetically in the book, rather than by category. This will make it easier to discuss and find required properties. You can display the entries either way in your own application. The variable associated with the button is renamed.

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#include <iostream> using namespace std; void showflags (long f); int main () { long f; f = coutflags(); showflags(f); coutsetf(ios::showpos); coutsetf(ios::scientific);

a. Locate the (Name) entry at the top of the list. b. Click the button1 text after this property.1 c. Type the new name btnLoad.

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f = coutflags(); showflags(f); coutunsetf(ios::scientific); f = coutflags(); showflags(f); return 0; } void showflags(long f) { long i; for(i=0x4000; i; i = i >> 1) if(i & f) cout << "1 "; else cout << "0 "; cout << "\n"; C++ }

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