What does if(‘;’) do and mean? [closed]

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Whatever is in the parentheses will be interpreted as a boolean value, either true or false. If it’s a character, then in most programming languages, this interpretation happens via two steps:

  1. the character is interpreted as an integer, usually its ASCII value
  2. the integer is interpreted as a boolean (usually false for 0 and true for any other number)

So if(';') {...} will have the same effect as if(true) {...}

In some programming languages, strings interpreted as a boolean value are true if they have at least one character and false if they are empty (have length zero). So again, this would cause the code to run.

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