(gawk.info.gz) If Statement

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(gawk.info.gz) While Statement

 
 7.4.1 The `if'-`else' Statement
 -------------------------------
 
 The `if'-`else' statement is `awk''s decision-making statement.  It
 looks like this:
 
      if (CONDITION) THEN-BODY [else ELSE-BODY]
 
 The CONDITION is an expression that controls what the rest of the
 statement does.  If the CONDITION is true, THEN-BODY is executed;
 otherwise, ELSE-BODY is executed.  The `else' part of the statement is
 optional.  The condition is considered false if its value is zero or
 the null string; otherwise, the condition is true.  Refer to the
 following:
 
      if (x % 2 == 0)
          print "x is even"
      else
          print "x is odd"
 
    In this example, if the expression `x % 2 == 0' is true (that is, if
 the value of `x' is evenly divisible by two), then the first `print'
 statement is executed; otherwise, the second `print' statement is
 executed.  If the `else' keyword appears on the same line as THEN-BODY
 and THEN-BODY is not a compound statement (i.e., not surrounded by
 curly braces), then a semicolon must separate THEN-BODY from the `else'.
 To illustrate this, the previous example can be rewritten as:
 
      if (x % 2 == 0) print "x is even"; else
              print "x is odd"
 
 If the `;' is left out, `awk' can't interpret the statement and it
 produces a syntax error.  Don't actually write programs this way,
 because a human reader might fail to see the `else' if it is not the
 first thing on its line.
 

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(gawk.info.gz) While Statement