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The data structure SET provides a structuring of a mathematical set on a simple data type, such as characters. To create a data type whose values are sets, the TYPE section can be used : TYPE BaseValue = SET OF 2.. 16. The data type following the Pascal reserved words SET OF is called the set's base type. The base type must be an ordinary data type. In this example, it is a subrange of INTEGER type data. Also, the number of values in the base type (its cardinality) is limited to 256 in Turbo Pascal.

For loops can count forwards and backwards. EXAMPLE 1: Write a program to count to ten. PROGRAM FORCOUNT; VAR COUNTER :INTEGER; BEGIN WRITELN('FOR COUNT'); FOR COUNTER := 1 TO 10 DO WRITELN(COUNTER); END. RESULT FOR COUNT 1 2 3 ... 10 PROGRAM EXPLANATION: COUNTER starts at one and goes up to ten, and, for each successive COUNTER value, the loop should do a statement, in this case the Writeln statement. The For Copyright © Genetic Computer School, Singapore 1995 Page 36 statement initializes the COUNTER and increases it by one each time through the loop, and test for done when COUNTER is greater than ten.

Repetitive statements causes one or more statements to repeat. There are three repetitive statement types: WHILE, REPEAT and FOR. 1 USING FOR LOOP A For loop produces more concise programming than WHILE or REPEAT loops. It has the starting value and the ending value. For loops can count forwards and backwards. EXAMPLE 1: Write a program to count to ten. PROGRAM FORCOUNT; VAR COUNTER :INTEGER; BEGIN WRITELN('FOR COUNT'); FOR COUNTER := 1 TO 10 DO WRITELN(COUNTER); END. RESULT FOR COUNT 1 2 3 ...

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