June 2014
Beginner
480 pages
9h 12m
English
Content preview from C++ For Dummies, 7th Edition
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Chapter 5
Controlling Program Flow
In This Chapter
Controlling the flow through the program
Executing a group of statements repetitively
Avoiding infinite loops
The simple programs that appear in Chapters 1 through 4 process a fixed number of inputs, output the result of that calculation, and quit. However, these programs lack any form of flow control. They cannot make tests of any sort. Computer programs are all about making decisions. If the user presses a key, the computer responds to the command.
For example, if the user presses Ctrl+C, the computer copies the currently selected area to the Clipboard. If the user moves the mouse, the pointer moves on the screen. If the user clicks the right mouse button with the Windows key depressed, the computer crashes. The list goes on and on. Programs that don’t make decisions are necessarily pretty boring.
Flow-control commands allow the program to decide what action to take based on the results of the C++ logical operations performed (see Chapter 4). There are basically three types of flow-control statements: the branch, the loop, and the switch.
Controlling Program Flow with the Branch Commands
The simplest form of flow control is the ...
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