Reference Language | Libraries | Comparison | Changes
isAlphaNumeric(thisChar)
Description
Analyse if a char is alphanumeric.
Parameters
thisChar: the char to be analysed.
Returns
True or false.
isAlpha(thisChar)
Description
Analyse if a char is is alpha.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isAscii(thisChar)
Description
Analyse if a char is ASCII.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isWhitespace(thisChar)
Description
Analyse if a char is a white space.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isControl(thisChar)
Description
Analyse if a char is a control character.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isDigit(thisChar)
Description
Analyse if a char is a digit.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isGraph(thisChar)
Description
Analyse if a char is a printable character.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isLowerCase(thisChar)
Description
Analyse if a char is a lower case character.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isPrintable(thisChar)
Description
Analyse if a char is a printable character.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isPunct(thisChar)
Description
Analyse if a char is punctuation character.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isSpace(thisChar)
Description
Analyse if a char is a space character.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isUpperCase(thisChar)
Description
Analyse if a char is an upper case character.
Parameters
thisChar: the char to be analysed
Returns
True or false.
isHexadecimalDigit(thisChar)
Description
Analyse if a char is a valid hexadecimal digit.
Parameters
thisChar: the char to be analysed
Returns
True or false.
Examples
Character analysis operators
Examples using the character analysis operators.
Send any byte and the sketch will tell you about it.
created 29 Nov 2010
modified 2 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// send an intro:
Serial.println("send any byte and I'll tell you everything I can about it");
Serial.println();
}
void loop() {
// get any incoming bytes:
if (Serial.available() > 0) {
int thisChar = Serial.read();
// say what was sent:
Serial.print("You sent me: \'");
Serial.write(thisChar);
Serial.print("\' ASCII Value: ");
Serial.println(thisChar);
// analyze what was sent:
if (isAlphaNumeric(thisChar)) {
Serial.println("it's alphanumeric");
}
if (isAlpha(thisChar)) {
Serial.println("it's alphabetic");
}
if (isAscii(thisChar)) {
Serial.println("it's ASCII");
}
if (isWhitespace(thisChar)) {
Serial.println("it's whitespace");
}
if (isControl(thisChar)) {
Serial.println("it's a control character");
}
if (isDigit(thisChar)) {
Serial.println("it's a numeric digit");
}
if (isGraph(thisChar)) {
Serial.println("it's a printable character that's not whitespace");
}
if (isLowerCase(thisChar)) {
Serial.println("it's lower case");
}
if (isPrintable(thisChar)) {
Serial.println("it's printable");
}
if (isPunct(thisChar)) {
Serial.println("it's punctuation");
}
if (isSpace(thisChar)) {
Serial.println("it's a space character");
}
if (isUpperCase(thisChar)) {
Serial.println("it's upper case");
}
if (isHexadecimalDigit(thisChar)) {
Serial.println("it's a valid hexadecimaldigit (i.e. 0 - 9, a - F, or A - F)");
}
// add some space and ask for another byte:
Serial.println();
Serial.println("Give me another byte:");
Serial.println();
}
}
Corrections, suggestions, and new documentation should be posted to the Forum.
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.
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