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:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
====== 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 ========
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() {
}
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
====== TEST START ======
Inside the DO WHILE loop: i = 10
====== TEST END ========
- 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() {
}
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
====== TEST START ======
====== TEST END ========
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