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What are switch expressions in D?
Mohe Ud Din SheikhOverview
In D programming language, switch works similarly to the if statement, but its code is relatively clearer and easier to understand.
In the switch statement, there is a block of code against each value under comparison, known as a case. If the statement matches any case value, it executes that block of code. Otherwise, the default case code gets executed.
Syntax
Let's review the syntax for a better understanding.
switch (c) {
case 1:
//This block will execute if the passed value is equal to 1
break;
case 2:
//This block will execute if the passed value is equal to 2
break;
case 3:
//This block will execute if the passed value is equal to 3
break;
default:
//This block will execute if the passed value is not equal to any case
break;
}Syntax of `switch` statement in the D language
We use switch expressions in which we pass the value that will be compared with the case value. If the value is matches with the case, that case block will be executed.
Example
Let's have a look at the following example.
import std.stdio;
void main() {
// Passing values to c
foreach (c ; [ 1, 2,3,20 ]) {
// Passing the values of c to the switch statment
switch (c) {
// Declaring case 1 code block
case 1:
writeln("I am from case 1");
break;
// Declaring case 2 code block
case 2:
writeln("I am from case 2");
break;
// Declaring case 3 code block
case 3:
writeln("I am from case 3");
break;
// Declaring default code block
default:
writeln("I am from default case");
break;
}
}
}Program example of switch in the D language
Explanation
- Line 7: We use
switchexpressions in which we pass the values that will be compared with thecasevalue. - Lines 9–24: We declare different cases. Either the matched
caseor thedefaultcase code block will be executed.
RELATED TAGS
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d
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Mohe Ud Din SheikhCopyright ©2022 Educative, Inc. All rights reserved
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