Conditions

A conditional statement allows to evaluate one or more conditional instructions. Depending on the result, a block of code can be either executed or skipped. Conditional statements can be found in nearly all programming languages. It is an important part of the control flow.

Single Condition

A conditional statement starts with an IF keyword and ends with an END keyword.

Syntax

if
  <condition>
then
  <consequent>
else
 <alternative>
end

<condition> - a conditional instruction. This instruction turns the condition result into either true or false. <consequent> - a branch of the code that executes if the condition result is true. <alternative> - an optional branch of the code that executes if the condition result is false. If else is omitted the flow skips the consequent branch and continues after a closing end keyword.

Example

if
  is_player_playing 0
then
  0ace: "player is ready"
else
  0ace: "player is not ready"
end

Depending on the result of the is_player_playing instruction, one or another message will be displayed.

Multiple Conditions (AND)

if and allows to combine up to 8 conditional instructions and execute a block of code if all of them are true.

Syntax

if and
  <condition 1>
  <condition 2>
  ...
  <condition 8>
then
  <consequent>
else
  <alternative>
end

<consequent> - a branch of the code that executes if all conditions are true. <alternative> - an optional branch of the code that executes if any condition is false. If else is omitted the flow skips the consequent branch and continues after a closing end keyword.

Short-circuit evaluation is not supported. All conditions are evaluated regardless of the result of the preceding checks.

Example

Checking if a number is within the given range:

int x
if and
  x >= 0
  x <= 10
then
  0ace: "x is between 0 an 10"
end

Multiple Conditions (OR)

if or allows to combine up to 8 conditional instructions and execute a block of code if at least one of them is true.

Syntax

if or
  <condition 1>
  <condition 2>
  ...
  <condition 8>
then
  <consequent>
else
  <alternative>
end

<consequent> - a branch of the code that executes if any condition is true. <alternative> - an optional branch of the code that executes if all conditions are false. If else is omitted the flow skips the consequent branch and continues after a closing end keyword.

Short-circuit evaluation is not supported. All conditions are evaluated regardless of the result of the preceding checks.

Example

Checking if the vehicle model matches one of the given choices:

if or
  model == #PCG600
  model == #FREEWAY
then
  0ace: "model is either PCG600 or Freeway"
else
  0ace: "model is neither PCG600 nor Freeway"
end