Programming in PASCAL : Iteration / PDF
Programming in PASCAL : Iteration / PDF
Sample of the PDF document
Introduction
Iteration, also known as repetition or
looping, is another important construct in any procedural language. Nearly all problem solutions require some
means of repeating blocks of code. There
are three constructs that can be used for repetition:
Ø The FOR loop
Ø The WHILE loop
Ø The REPEAT UNTIL loop
The FOR Loop
This is essentially a counter controlled loop
where a block of code is repeated a number of times. The FOR statement includes:
Ø The initialisation of the counter variable
Ø The setting of the final value of the counter
Ø The value that the counter variable will be incremented by as each
loop is executed.
The FOR loop takes the form:
for counter_variable := startvalue to endvalue do
statement;
or
for counter_variable := startvalue to endvalue do
begin
statement1;
statement2;
……;
end;
Note that there is no semi-colon after the do otherwise the statements will never be executed more than once.
Now try the first example:.......
0 commentaires: