Dokumentation zu: if(LPC)

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        if (expr1) statement1;
        else if (expr2) statement2;
        else if (exprN) statementN;
        else statementX;

        The if() statement implements the conditional execution of statements.
        The expressions 'expr1' .. 'exprN' are evaluate in the order they
        appear until one of the expressions returns non-0 ('true'). At that
        point, the statement associated with the expression is executed, and
        the program continues after the if() statement. If none of the
        expressions evaluate to 'true', the statementX in the 'else'-branch
        is executed.

        Both the 'else if' branches and the 'else' branch are optional, and
        there can be any number of 'else if' branches - but there must be one
        'if' branch, and the branches must be in the order given above.

        Any 'else' or 'else if' always relates to the immediately preceeding
        'if' resp. 'else if' conditional. This means that

          if (a)
          if (b) do_b;
          else do_c;

        is interpreted as

          if (a) {
            if (b) do_b;
            else   do_c;

        for(LPC), foreach(LPC), do-while(LPC), while(LPC), switch(LPC)

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