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Is case mandatory in switch statement?
the default case in switch statement is not necessary,but it is useful when no case in switch is satisified or not matched then automatically it executes the default statement,if it is not there ,the switch statement is terminated.
Which is faster if or switch?
A switch statement is usually more efficient than a set of nested ifs. Deciding whether to use if-then-else statements or a switch statement is based on readability and the expression that the statement is testing. Speed: A switch statement might prove to be faster than ifs provided number of cases are good.
How is a switch statement used in a program?
A switch statement tests the value of a variable and compares it with multiple cases. Once the case match is found, a block of statements associated with that particular case is executed. Each case in a block of a switch has a different name/number which is referred to as an identifier.
Do you have to have a case statement in switch?
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 to use a constant in a switch statement?
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 equal to a case, the statements following that case will execute until a break statement is reached.
Can a default label appear in a switch statement?
A case or default label can only appear inside a switch statement. The type of switch expression and case constant-expression must be integral. The value of each case constant-expression must be unique within the statement body.