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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
: The character is not a letter
A: The character is a letter
Autoscroll
Clear output
9600 baud
Newline
See Also
- Language : isAlphaNumeric()
- Language : isAscii()
- Language : isControl()
- Language : isDigit()
- Language : isGraph()
- Language : isHexadecimalDigit()
- Language : isLowerCase()
- Language : isPrintable()
- Language : isPunct()
- Language : isSpace()
- Language : isUpperCase()
- Language : isWhitespace()
- Language : char
- Language : if (conditional operators)
- Language : while (conditional operators)
- Language : read()
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