do while

Descripción

El bucle do ... while funciona de la misma manera que el bucle while, con la excepción de que la condición se comprueba al final del bucle, por lo que el bucle se ejecutará siempre al menos una vez.

Sintaxis

do { // bloque de instrucciones } while (condición de prueba);

Ejemplo

Ejemplo 1

void setup() { Serial.begin(9600); Serial.println("====== TEST START ======"); int i = 0; do { Serial.print("Inside the DO WHILE loop: i = "); Serial.println(i); i++; // increase i by 1 } while (i < 5); Serial.println("====== TEST END ========"); } void loop() { }

The result on Serial Monitor:

COM6
Send
====== TEST START ====== Inside the DO WHILE loop: i = 0 Inside the DO WHILE loop: i = 1 Inside the DO WHILE loop: i = 2 Inside the DO WHILE loop: i = 3 Inside the DO WHILE loop: i = 4 ====== TEST END ========
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

Ejemplo 2

int x = 0; do { delay (50); // espera a que el sensor se estabilice x = readSensors(); // check the sensors } while (x < 100);

do...while loop vs while loop

The while loop checks the condition before executing the block of code; conversely, the do while loop checks the condition after executing the block of code. Therefore, the do while loop will always be executed at least once, even if the condition is false at the beginning.

The do...while and while loop are the same, except for the case in which the condition is false at the beginning.

For example:

  • Code with do...while loop
void setup() { Serial.begin(9600); Serial.println("====== TEST START ======"); int i = 10; do { Serial.print("Inside the DO WHILE loop: i = "); Serial.println(i); i++; // increase i by 1 } while (i < 5); Serial.println("====== TEST END ========"); } void loop() { }
COM6
Send
====== TEST START ====== Inside the DO WHILE loop: i = 10 ====== TEST END ========
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  
  • Code with while loop
void setup() { Serial.begin(9600); Serial.println("====== TEST START ======"); int i = 10; while (i < 5) { Serial.print("Inside the DO WHILE loop: i = "); Serial.println(i); i++; // increase i by 1 } Serial.println("====== TEST END ========"); } void loop() { }
COM6
Send
====== TEST START ====== ====== TEST END ========
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

※ Nota:

There are three ways to escape the do while loop:

  • The condition of the do while loop becomes false.
  • The execution of the code reaches a break statement inside the loop.
  • The execution of the code reaches a goto statement inside the loop, which jumps to a label located outside of the loop.

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