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Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.

Name |

### isDigit()

Examples |
    char tab = 't';    // tab character
    char digit = '1';   // digit character
    char upperA = 'A';  // upper case 'A'
    char lowerA = 'a';  // lower case 'a'
    char colon = ',';   // comma
    char val;

    void setup()
    {
      Serial.begin(9600);

      val = toLowerCase(upperA);
      Serial.print(val);                        // prints 'a'
      Serial.print(" ");
      Serial.print(isAlphaNumeric(digit),DEC);  // prints 1 (true)
      Serial.print(" ");
      Serial.print(isAlpha(upperA),DEC);        // prints 1 (true)
      Serial.print(" ");
      Serial.print(isAscii(upperA),DEC);        // prints 1 (true)
      Serial.print(" ");
      Serial.print(isWhitespace(tab),DEC);      // prints 1 (true)
      Serial.print(" ");
      Serial.print(isGraph(lowerA),DEC);        // prints 1 (true)
      Serial.print(" ");
      Serial.print(isLowerCase(lowerA),DEC);    // prints 1 (true)
      Serial.print(" ");
      Serial.print(isSpace(val),DEC);           // prints 0 (false)
      Serial.print(" ");
      Serial.print(isUpperCase(upperA),DEC);    // prints 1 (true)
      Serial.print(" ");
      Serial.print(isControl(upperA), DEC);     // prints 0 (false)
      Serial.print(" ");
      Serial.print(isDigit(digit), DEC);        // prints 1 (true)
      Serial.print(" ");
      Serial.print(isGraph(digit), DEC);        // prints 1 (true)
      Serial.print(" ");
      Serial.print(isPunct(colon), DEC);        // prints 1 (true)
      Serial.print(" ");
      Serial.print(isHexadecimalDigit('F'), DEC);  // prints 1 (true)
      Serial.print(" ");
      val = toLowerCase('K');                   // prints 'k'
      Serial.print(val);
      Serial.print(" ");
      val = toAscii(40);
      Serial.println(val);                      // prints '('
    }

    void loop()
    {

    }
Description | Checks for a digit (0 through 9).
Syntax |
    isDigit(var)
Parameters |

var | int or char variable name referencing the value

Returns | boolean: true or false
Usage | Application
Related | isAlphaNumeric() isAlpha() isAscii() isWhitespace() isControl()
isDigit()
isGraph()
isLowerCase()
isPrintable()
isPunct()
isSpace()
isUpperCase()
isHexadecimalDigit()

Updated on July 07, 2011 11:08:28pm PDT