Don't use reserved name (this) as a variable name in the example code

Language/Functions/Characters/isAlpha.adoc

@@ -50,7 +50,7 @@ isAlpha(thisChar)
 
 [source,arduino]
 ----
-if (isAlpha(this))      // tests if this is a letter
+if (isAlpha(myChar))      // tests if myChar is a letter
 {
 	Serial.println("The character is a letter");
 }

Language/Functions/Characters/isAlphaNumeric.adoc

@@ -50,7 +50,7 @@ isAlphaNumeric(thisChar)
 
 [source,arduino]
 ----
-if (isAlphaNumeric(this))      // tests if this isa letter or a number
+if (isAlphaNumeric(myChar))      // tests if myChar isa letter or a number
 {
 	Serial.println("The character is alphanumeric");
 }

Language/Functions/Characters/isAscii.adoc

@@ -50,7 +50,7 @@ isAscii(thisChar)
 
 [source,arduino]
 ----
-if (isAscii(this))      // tests if this is an Ascii character
+if (isAscii(myChar))      // tests if myChar is an Ascii character
 {
 	Serial.println("The character is Ascii");
 }

Language/Functions/Characters/isControl.adoc

@@ -50,7 +50,7 @@ isControl(thisChar)
 
 [source,arduino]
 ----
-if (isControl(this))      // tests if this is a control character
+if (isControl(myChar))      // tests if myChar is a control character
 {
 	Serial.println("The character is a control character");
 }

Language/Functions/Characters/isDigit.adoc

@@ -50,7 +50,7 @@ isDigit(thisChar)
 
 [source,arduino]
 ----
-if (isDigit(this))      // tests if this is a digit
+if (isDigit(myChar))      // tests if myChar is a digit
 {
 	Serial.println("The character is a number");
 }

Language/Functions/Characters/isGraph.adoc

@@ -50,7 +50,7 @@ isGraph(thisChar)
 
 [source,arduino]
 ----
-if (isGraph(this))      // tests if this is a printable character but not a blank space.
+if (isGraph(myChar))      // tests if myChar is a printable character but not a blank space.
 {
 	Serial.println("The character is printable");
 }

Language/Functions/Characters/isHexadecimalDigit.adoc

@@ -52,7 +52,7 @@ isHexadecimalDigit(thisChar)
 
 [source,arduino]
 ----
-if (isHexadecimalDigit(this))      // tests if this is an hexadecimal digit
+if (isHexadecimalDigit(myChar))      // tests if myChar is an hexadecimal digit
 {
 	Serial.println("The character is an hexadecimal digit");
 }

Language/Functions/Characters/isLowerCase.adoc

@@ -50,7 +50,7 @@ isLowerCase(thisChar)
 
 [source,arduino]
 ----
-if (isLowerCase(this))      // tests if this is a lower case letter
+if (isLowerCase(myChar))      // tests if myChar is a lower case letter
 {
 	Serial.println("The character is lower case");
 }

Language/Functions/Characters/isPrintable.adoc

@@ -50,7 +50,7 @@ isPrintable(thisChar)
 
 [source,arduino]
 ----
-if (isPrintable(this))      // tests if this is printable char
+if (isPrintable(myChar))      // tests if myChar is printable char
 {
 	Serial.println("The character is printable");
 }

Language/Functions/Characters/isPunct.adoc

@@ -50,7 +50,7 @@ isPunct(thisChar)
 
 [source,arduino]
 ----
-if (isPunct(this))      // tests if this is a punctuation character
+if (isPunct(myChar))      // tests if myChar is a punctuation character
 {
 	Serial.println("The character is a punctuation");
 }

Language/Functions/Characters/isSpace.adoc

@@ -50,7 +50,7 @@ isSpace(thisChar)
 
 [source,arduino]
 ----
-if (isSpace(this))      // tests if this is the space character
+if (isSpace(myChar))      // tests if myChar is the space character
 {
 	Serial.println("The character is a space");
 }

Language/Functions/Characters/isUpperCase.adoc

@@ -46,7 +46,7 @@ isUpperCase(thisChar)
 
 [source,arduino]
 ----
-if (isUpperCase(this))      // tests if this is an upper case letter
+if (isUpperCase(myChar))      // tests if myChar is an upper case letter
 {
 	Serial.println("The character is upper case");
 }

Language/Functions/Characters/isWhitespace.adoc

@@ -50,7 +50,7 @@ isWhitespace(thisChar)
 
 [source,arduino]
 ----
-if (isWhitespace(this))      // tests if this is a white space
+if (isWhitespace(myChar))      // tests if myChar is a white space
 {
 	Serial.println("The character is a white space");
 }