A case clause used to match against expression . If the expression matches the specified valueN , the statements inside the case clause are executed until either the end of the switch statement or a break .
- case 0: day = “Sunday”; break;
- case 1: day = “Monday”; break;
- case 2: day = “Tuesday”; break;
- case 3: day = “Wednesday”; break;
- case 4: day = “Thursday”; break;
- case 5: day = “Friday”; break;
- case 6: day = “Saturday”; }
The switch statement executes a block of code depending on different cases. The value of the expression is then compared with the values of each case in the structure. If there is a match, the associated block of code is executed. The switch statement is often used together with a break or a default keyword (or both).
How do you use a switch case?
Rules for switch statement
- An expression must always execute to a result.
- Case labels must be constants and unique.
- Case labels must end with a colon ( : ).
- A break keyword must be present in each case.
- There can be only one default label.
- We can nest multiple switch statements.
What is better switch or if else?
A switch statement is usually more efficient than a set of nested ifs. Check the Testing Expression: An if-then-else statement can test expressions based on ranges of values or conditions, whereas a switch statement tests expressions based only on a single integer, enumerated value, or String object.
Can we use or in switch case?
The switch-case construct is pretty similar to an if-else statement, you can use the OR operator in an if however.
Which is faster if statement or switch?
As it turns out, the switch statement is faster in most cases when compared to if-else , but significantly faster only when the number of conditions is large. The primary difference in performance between the two is that the incremental cost of an additional condition is larger for if-else than it is for switch .