conditions.md

Conditions and If Statements

One supports the usual logical conditions from mathematics:

• Less than: a < b
• Less than or equal to: a <= b
• Greater than: a > b
• Greater than or equal to: a >= b
• Equal to a == b
• Not Equal to: a != b
  You can use these conditions to perform different actions for different decisions.

One has the following conditional statements:

• Use if to specify a block of code to be executed, if a specified condition is true
• Use else to specify a block of code to be executed, if the same condition is false
• Use else if to specify a new condition to test, if the first condition is false
• Use switch to specify many alternative blocks of code to be executed

The if Statement

The One if statement tests the condition. It executes the if block if condition is true.

Syntax

if(condition){
//code to be executed
}

Example

if (20 > 18) {
  System.print("condition is true")
}

The if-else Statement

The One if-else statement also tests the condition. It executes the if block if condition is true otherwise else block is executed.

Syntax

if(condition){
//code if condition is true
}else{
//code if condition is false
}

Example

if (20 < 18) {
  System.print("condition is true")
} else {
  System.print("condition is not true")
}

// Outputs "condition is not true"

The else if Statement

The if-else-if ladder statement executes one condition from multiple statements.

Syntax

if(condition1){
//code to be executed if condition1 is true
}else if(condition2){
//code to be executed if condition2 is true
}
else if(condition3){
//code to be executed if condition3 is true
}
...
else{
//code to be executed if all the conditions are false
}

Example

if (22 < 10) {
  System.print("a")
} else if (22 < 20) {
  System.print("b")
} else {
  System.print("c")
}
// Outputs "c"