How to write if ELSE in REXX?

These commands use underlying REXX processing to evaluate the expression.

1. The basic syntax is: IF THEN ELSE
2. The conditional commands and can be included in the same line as THEN and ELSE , respectively.

What is nested IF ELSE instruction?

Sometimes it is necessary to have one or more IF/THEN/ELSE instructions within other IF/THEN/ELSE instructions. Having one type of instruction within another is called nesting. With nested IF instructions, it is important to match each IF with an ELSE and each DO with an END.

When statement in REXX?

The select statement has a range of when statements to evaluate different conditions. Each when clause has a different condition which needs to be evaluated and the subsequent statement is executed. The otherwise statement is used to run any default statement if the previous when conditions do not evaluate to true.

Which of the following binary string functions are provided by Rexx?

z/OS TSO/E REXX Reference REXX provides a rich set of built-in functions, including character manipulation, conversion, and information functions. There are six other built-in functions that TSO/E provides: EXTERNALS, FIND, INDEX, JUSTIFY, LINESIZE, and USERID.

Does REXX do until loop?

The do-until loop is a slight variation of the do while loop. This loop varies in the fact that is exits when the condition being evaluated is false.

What is Substr in REXX?

The value of any REXX variable is a string of characters. To select a part of a string, use the SUBSTR( ) function. SUBSTR is an abbreviation for substring. The position of the first character that is to appear in the result (Characters in a string are numbered 1,2,3.) The length of the result.

What is if else statement with example?

If the Boolean expression evaluates to true, then the if block will be executed, otherwise, the else block will be executed. C programming language assumes any non-zero and non-null values as true, and if it is either zero or null, then it is assumed as false value.

Is else if a nested IF statement?

Nested Else-if statements Nested else-if is used when multipath decisions are required. Whenever a true test-expression if found, statement associated with it is executed. When all the n test-expressions becomes false, then the default else statement is executed.

What is NOP in REXX?

Advertisements. This function means to perform no operation. This command is normally used in if statements.

How do you write REXX code?

To write a line of output, you use the REXX instruction SAY followed by the text you want written. /* Sample REXX Program */ SAY ‘Hello world!’ This program starts with a comment line to identify it as a REXX program. A comment begins with /* and ends with */ .

How do you declare an array in REXX?

Creating Arrays Arrays are created with the same naming convention which is used for variables in Rexx. Arrayname − This is the name provided to the array. Index − This is the index position in the array to refer to a specific element. Value − This is the value assigned to the index element in the array.

Do Until and DO WHILE?

The DO WHILE statement causes the statements in the DO-group to be executed in a loop, provided the condition specified in the test expression is satisfied. The DO UNTIL statement causes a group of statements to execute until a certain condition is satisfied. As long as the condition is false, the group is repeated.

When to use if or else in Rexx?

Rexx – If else statement. The next decision-making statement is the if-else statement. An if statement can be followed by an optional else statement, which executes when the Boolean expression is false. Syntax. The general form of this statement in Rexx is as follows. In Rexx, the condition is an expression which evaluates to either true or false.

Which is the next decision making statement in Rexx?

The next decision-making statement is the if-else statement. An if statement can be followed by an optional else statement, which executes when the Boolean expression is false. The general form of this statement in Rexx is as follows. − In Rexx, the condition is an expression which evaluates to either true or false.

What do you need to know about the REXX language?

New with TSO/E version 2, Rexx is a high-level procedural language that allows programmers to mix instructions with TSO commands, and build high-powered tools and utilities, called “exec”s. Rexx is a programming language, and a scripting language. Rexx is a fascinating language. It is, from my viewpoint, IBM’s answer to Basic.

What is the definition of a condition in Rexx?

In Rexx, the condition is an expression which evaluates to either true or false. If the condition is true, then the subsequent statements in the loop are executed. The following diagram shows the diagrammatic explanation of this loop.