文字検査関数

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Arduino公式リファレンスより抜粋しました。
すべての関数は true または false を返します。

isAlphaNumeric(thisChar)  : Analyse if a char is alphanumeric.

isAlpha(thisChar) : Analyse if a char is is alpha.

isAscii(thisChar) :Analyse if a char is ASCII.

isWhitespace(thisChar):Analyse if a char is a white space.

isControl(thisChar) :Analyse if a char is a control character.

isDigit(thisChar):Analyse if a char is a digit.

isGraph(thisChar):Analyse if a char is a printable character.

isLowerCase(thisChar):Analyse if a char is a lower case character.

isPrintable(thisChar):Analyse if a char is a printable character.

isPunct(thisChar):Analyse if a char is punctuation character.

isSpace(thisChar):Analyse if a char is a space character.

isUpperCase(thisChar):Analyse if a char is an upper case character.

isHexadecimalDigit(thisChar):Analyse if a char is a valid hexadecimal digit.
●Example from Arduino Web Site

[c]
/*
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();
}
}
[/c]

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