isAlpha()

Description

Check if a character is alpha (that is a letter) or not. Returns true if the character contains a letter.

Syntax

isAlpha(thisChar)

Parameter Values

  • thisChar: variable. Allowed data types: char.

Return Values

  • true: If thisChar is alpha.
  • false: Otherwise

Example Code

char myChar; void setup() { Serial.begin(9600); myChar = ' '; Serial.print(myChar); Serial.print(": "); if (isAlpha(myChar)) // tests if myChar is a letter Serial.println("The character is a letter"); else Serial.println("The character is not a letter"); myChar = 'A'; Serial.print(myChar); Serial.print(": "); if (isAlpha(myChar)) // tests if myChar is a letter Serial.println("The character is a letter"); else Serial.println("The character is not a letter"); } void loop() {}

The result in Serial Monitor:

COM6
Send
: The character is not a letter A: The character is a letter
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

See Also

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Arduino UNO R3
Arduino Starter Kit
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