Control

Introduction

The Control blocks in VEXcode 123 manage the flow of a project by handling loops, conditions, delays, and stopping execution.

Below is a list of available blocks:

• wait – Pauses execution for a specific duration.

• wait until – Pauses execution until a specified condition is met.

• repeat – Repeats enclosed blocks a specific number of times.

• forever – Repeats enclosed blocks indefinitely.

• repeat until – Repeats enclosed blocks until a condition is met.

• while – Repeats enclosed blocks while a condition remains true.

• if – Runs enclosed blocks if a condition is true.

• if / else – Runs one set of blocks if a condition is true, otherwise runs another.

• if / else if / else – Runs different sets of blocks depending on multiple conditions.

• break – Exits a repeat, forever, repeat until, or while loop immediately.

• stop project – Ends the execution of the project.

wait

The wait block pauses for a specific amount of time before moving to the next block.

wait stack block

等待 (1) 秒

Parameters	Description
time	The amount of time to wait, as a positive integer or decimal in seconds.

Example

aria-description goes here

当开始 :: hat events
[Drive forward then stop.]
驱动 [向前 v]
等待 (2) 秒
驱动停止

wait until

The wait until block pauses execution until a specified condition is met before proceeding to the next block.

wait until stack block

等到 <>

Parameters	Description
condition	The condition that must be met before moving on to the next block.

Example

aria-description goes here

当开始 :: hat events
[Drive forward when the sound button is pressed.]
等到 <[soundIcon v] 按下了？>
驱动 [向前 v] [200] [毫米 v]

repeat

The repeat block runs the blocks inside it a set number of times.

repeat c block

重复 [10]
结束

Parameters	Description
times	A whole number that sets how many times the repeat block runs.

Example

aria-description goes here

当开始 :: hat events
[Drive in a square pattern.]
重复 [4]
驱动 [向前 v] [200] [毫米 v]
[右 v] 转 [90] 度

forever

The forever block keeps running the blocks inside it again and again without stopping.

forever c block

永久循环
结束

Parameters	Description
	This block has no parameters.

Example

aria-description goes here

当开始 :: hat events
[Blink LED light in a pattern.]
永久循环
发光 [绿色 v]
等待 [0.5] 秒
发光 [灭 v]
等待 [0.5] 秒

repeat until

The repeat until block executes the enclosed blocks repeatedly while the condition evaluates as False.

repeat until block

重复直到 <>
结束

Parameters	Description
condition	An expression or variable that is evaluated before each iteration. If it evaluates as: False - The loop continues True - The loop stops

Example

aria-description goes here

当开始 :: hat events
[Blink LED light until the sound button is pressed.]
重复直到 <[soundIcon v] 按下了？>
发光 [绿色 v]
等待 [0.5] 秒
发光 [灭 v]
等待 [0.5] 秒

while

The while block executes the enclosed blocks repeatedly while the condition evaluates as True.

while c block

当 <>
结束

Parameters	Description
condition	An expression or variable that is evaluated before each iteration. If it evaluates as: True - The loop continues False - The loop stops

Example

当开始 :: hat events
[Turn the robot around.]
当 <(底盘归位角度值) [math_less_than v] [180]>
[右 v] 转
结束
驱动停止

if

The if block executes the enclosed block of code if the condition evaluates as True.

if block

如果 <> 那么
结束

Parameters	Description
condition	An expression or variable that is evaluated when the statement runs. If it evaluates as: True - The code inside the if block executes False - The block is skipped

Example

aria-description goes here

当开始 :: hat events
[Drive forward whenever the sound button is pressed.]
永久循环
如果 <[soundIcon v] 按下了？> 那么
驱动 [向前 v] [200] [毫米 v]

if / else

The if / else block determines which enclosed block of code runs based on whether the condition evaluates as True or False.

if then else block

如果 <> 那么
否则
结束

Parameters	Description
condition	An expression or variable that is evaluated when the statement runs. If it evaluates as: True - The code inside the if block executes False - The code inside the else block executes instead

Example

aria-description goes here

当开始 :: hat events
[Drive forward until a crash.]
永久循环
如果 <检测到碰撞？> 那么
驱动停止
否则
驱动 [向前 v] [200] [毫米 v]

if / else if / else

The if / else if / else block structure selects which enclosed block of code runs based on conditions:

• if runs its block of code if the condition evaluates as True.

• else if checks additional conditions only if all previous conditions evaluated as False. Multiple else if statements can be used.

• else runs its block of code only if none of the previous conditions evaluated as True.

if else if else block

如果 <> 那么
否则如果 <> 那么
否则
结束

Parameters	Description
condition	An expression or variable that is evaluated when the statement runs. The first condition that evaluates as: True - Determines which block of code executes False - If none are True, the else block of code runs

Example

aria-description goes here

当开始 :: hat events
[Turn right for the right button, left for the left button.]
永久循环
如果 <[ifbuttonright v] 按下了？> 那么
[右 v] 转
否则如果 <[ifbuttonleft v] 按下了？> 那么
[左 v] 转
否则
驱动停止

break

The break block exits a loop immediately.

break stack block

退出循环

Parameters	Description
	This block has no parameters.

Example

aria-description goes here

当开始 :: hat events
[Flash the LED until the sound button is pressed.]
永久循环
发光 [绿色 v]
等待 [0.5] 秒
发光 [蓝色 v]
等待 [0.5] 秒
如果 <[soundIcon v] 按下了？> 那么
退出循环

stop project

The stop project block ends a running project.

stop project block

停止程序

Parameters	Description
	This block has no parameters.

Example

aria-description goes here

当开始 :: hat events
[Stop the project after a crash.]
永久循环
驱动 [向前 v]
如果 <检测到碰撞？> 那么
停止程序