switch Multiple-Selection Statement in c programming

Occasionally, an algorithm will contain a series of decisions in which a variable or expression is tested separately for each of the constant integral values it may assume, and different actions are taken. This is called multiple selection. C provides the switch statement to handle this.

The switch statement consists of a series of case labels, an optional default case and statements to execute for each case.
Occasionally, an algorithm will contain a series of decisions in which a variable or expression is tested separately for each of the constant integral values it may assume, and different actions are taken. This is called multiple selection. C provides the switch statement to handle this.

The switch statement consists of a series of case labels, an optional default case and statements to execute for each case.

The getchar function (from the standard input/output library) reads and returns one character from the keyboard.

Characters are normally stored in variables of type char. Characters can be stored in any integer data type because they’re usually represented as one-byte integers in the computer. Thus, we can treat a character as either an integer or a character, depending on its use.

Many computers today use the ASCII (American Standard Code for Information Interchange) character set in which 97 represents the lowercase letter 'a'.

EOF is often used as a sentinel value. EOF is a symbolic integer constant defined in ﹤stdio.h﹥

On Linux/UNIX systems and many others, the EOF indicator is entered by typing ctrl+d . On other systems, such as Microsoft Windows, the EOF indicator can be entered by typing ctrl+z.

Keyword switch is followed by the controlling expression in parentheses.

The value of this expression is compared with each of the case labels. If no match occurs, the default case executes. The break statement causes program control to continue with the statement after the switch. The break statement prevents the cases in a switch statement from running together.

Each case can have one or more actions. The switch statement is different from all other control statements in that braces are not required around multiple actions in a case of a switch.

Listing several case labels together simply means that the same set of actions is to occur for any of these cases.