C++ Switch Case Control Structure

In this Tutorial we will understand and learn the working of C++ Switch Case Control Structure.
A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each case.
Switch case statements are a substitute for long if statements that compare a variable to several “integral” values (“integral” values are simply values that can be expressed as an integer, such as the value of a char).
The condition of a switch statement is a value.
An important thing to note about the switch statement is that the case values may only be constant integral expressions.
Switch case conditions cannot contain conditional statements (>, <, <=,>=). It can only contain a constant integral value (not even floating point values)

Flowchart of Switch Case


c++ switch case statements flow diagram

Flow Chart diagram of Switch Case Structure

Basic Syntax of Switch Case statement
The following rules apply to a switch statement:

  • The expression used in a switch statement must have an integral type.
  • You can have any number of case statements within a switch. Each case is followed by the value to be compared to and a colon.
  • The constant-expression for a case must be the same data type as the variable in the switch, and it must be a constant or a literal.
  • When the variable being switched on is to a equal case, the statements following that case will execute until a break statement is reached.
  • When a break statement is reached, the switch terminates, and the flow of control jumps to the next line following the switch statement.
  • Not every case needs to contain a break. If no break appears, the flow of control will fall through to subsequent cases until a break is reached.
  • A switch statement can have an optional default case, which must appear at the end of the switch. The default case can be used for performing a task when none of the cases is true. No break is needed in the default case.
Example programĀ of Switch Case statement

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