Lära If Statement | Conditional Statements

An if statement is a construct that allows you to execute a code block if a specific condition is met.

The condition is an expression that evaluates to a bool value, which can be true or false. If the condition is true, the block of code is executed. If the condition is false, the block of code is skipped.

Syntax

if (condition) {
    // code block
};

The syntax of the conditional operator is so simple: if keyword, condition in the parentheses ( ) and a code block in the curly brackets { }.

The open curly bracket { } opens the code block, and the close curly bracket symbol closes it. Let's consider a example:

main.php


              123456
            
<?php
$num=5; 
if ($num>0) {   // 5 > 0 ?
  echo "Number is positive"; // output if it's `true` 
}    
?>

The condition was confirmed and the block of code worked. Let's consider a different example:

main.php


              123456
            
<?php
$num = 10; 
if ($num < 0) {   // 10 < 0 ?
  echo "Number is negative"; // output if it's `true` 
}    
?>

The condition was not confirmed, and the code block did not work.

Uppgift

Swipe to start coding

Complete the code to create a program that checks the price of a chocolate bar and prints the appropriate message. If the price of the chocolate bar is less than or equal to 3, the program should print "This chocolate bar has an average price". If the price of the chocolate bar is greater than 3, the program should print "This chocolate bar is expensive".

Lösning

Var allt tydligt?

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Avsnitt 3. Kapitel 1

single

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An if statement is a construct that allows you to execute a code block if a specific condition is met.

Syntax

if (condition) {
    // code block
};

The syntax of the conditional operator is so simple: if keyword, condition in the parentheses ( ) and a code block in the curly brackets { }.

The open curly bracket { } opens the code block, and the close curly bracket symbol closes it. Let's consider a example:

main.php


              123456
            
<?php
$num=5; 
if ($num>0) {   // 5 > 0 ?
  echo "Number is positive"; // output if it's `true` 
}    
?>

The condition was confirmed and the block of code worked. Let's consider a different example:

main.php


              123456
            
<?php
$num = 10; 
if ($num < 0) {   // 10 < 0 ?
  echo "Number is negative"; // output if it's `true` 
}    
?>

The condition was not confirmed, and the code block did not work.

Uppgift

Swipe to start coding

Lösning

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 1

single

If Statement

Syntax

Lösning

Awesome!

If Statement

Syntax

Lösning

Awesome!