if, else

The EGL keyword if marks the start of a set of statements (if any) that run only if a logical expression resolves to true. The optional keyword else marks the start of an alternative set of statements (if any) that run only if the logical expression resolves to false. The keyword end marks the close of the if statement.

logical expression

An expression (a series of operands and operators) that evaluates to true or false

statement

One or more EGL statements

You may nest if and other end-terminated statements to any level. Each end keyword refers to the most recent statement that was not ended and that begins with one of these keywords:

• if

• case

• try

• while

None of those statements is followed by a semicolon.

An example is as follows:

  if (userRequest = "U")
    try
      update myRecord;
      onException 
        myErrorHandler(12);  // ends program
    end
    try
      myRecord.myItem=25;
      replace record1;
      onException
        myErrorHandler(16); 
    end
  else
    try
      add record2;
      onException
        myErrorHandler(18);  // ends program
    end
    if (sysVar.systemType is WIN)
      myFunction01();
    else
      myFunction02();
    end
  end

Related tasks
Syntax diagram

Related reference
Logical expressions
EGL statements