String [] (accès à un élément)

Description

Accéder à un caractère particulier d'un objet String. Identique à charAt()

Syntaxe

char monChar = string[n]

Paramètres

  • Char monChar une variable char appelée monChar
  • string: une variable de type String()
  • n: emplacement du caractère à lire (type int)

※ Remarque:

le n-ième, caractère de la chaîne de l'objet 'string'''.

Exemple

void setup() { Serial.begin(9600); Serial.println("\n\nString charAt() and setCharAt():"); } void loop() { // make a string to report a sensor reading: String reportString = "SensorReading: 456"; Serial.println(reportString); // the reading's most significant digit is at position 15 in the reportString: String mostSignificantDigit = reportString.charAt(15); Serial.println("Most significant digit of the sensor reading is: " + mostSignificantDigit); // add blank space: Serial.println(); // you can alo set the character of a string. Change the : to a = character reportString.setCharAt(13, '='); Serial.println(reportString); // do nothing while true: while (true); }

※ Remarque:

If the string is modified, it is highly recommended using String.reserve() to prevent the memory fragmentation issue

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