Difference between revisions of "For"
Jwdietrich (talk | contribs) |
|||
| Line 1: | Line 1: | ||
{{for}} | {{for}} | ||
<br> | <br> | ||
| − | [[Keyword|keyword]] used with "[[to]]"\"[[downto]]" and "[[Do|do]]" to execute a loop in which the value of a control variable is incremented or decremented by 1 each time: | + | [[Keyword|keyword]] used with "[[To|to]]"\"[[Downto|downto]]" and "[[Do|do]]" to execute a loop in which the value of a control variable is incremented or decremented by 1 each time: |
| − | FOR ''control_variable'' := ''start'' [[ | + | FOR ''control_variable'' := ''start'' [[To|TO]] ''final'' DO ''statement'' |
which increases ''control_variable'' by 1 on each execution of the loop until the value is greater than or equal to ''final'' | which increases ''control_variable'' by 1 on each execution of the loop until the value is greater than or equal to ''final'' | ||
or | or | ||
| − | FOR ''control_variable'' := ''start'' [[ | + | FOR ''control_variable'' := ''start'' [[Downto|DOWNTO]] ''final'' do ''statement'' |
which decreases ''control_variable'' by 1 on each execution of the loop until the value is less than or equal to ''final'' | which decreases ''control_variable'' by 1 on each execution of the loop until the value is less than or equal to ''final'' | ||
| Line 30: | Line 30: | ||
{{Keywords}} | {{Keywords}} | ||
| − | [[ | + | |
| + | |||
| + | [[Category:Pascal]] | ||
[[Category:Control Structures]] | [[Category:Control Structures]] | ||
Revision as of 23:14, 16 October 2015
│
Deutsch (de) │
English (en) │
français (fr) │
русский (ru) │
keyword used with "to"\"downto" and "do" to execute a loop in which the value of a control variable is incremented or decremented by 1 each time:
FOR control_variable := start TO final DO statement
which increases control_variable by 1 on each execution of the loop until the value is greater than or equal to final or
FOR control_variable := start DOWNTO final do statement
which decreases control_variable by 1 on each execution of the loop until the value is less than or equal to final
Where control_variable is the variable to be set to the value of start. The control variable is increased or decreased by 1 on each loop until its value reaches or exceeds final.
For I:=1 To 100 Do statement;(repeats statement one hundred times, increasing I from 1 to 100)
for I:=100 downto 1 do ''statement'';(repeats statement one hundred times, decreasing I from 100 to 1)
- FOR will loop through only the single statement that follows it. To execute more than one statement, enclose the group of statements in a Begin/End block.
- In a for..to loop, if start is greater than final, the loop is not executed
- in a for..downto loop, if start is less than final, the loop is not executed
After the loop, the value of control_variable will be final. If the loop was not executed, the value of control_variable does not change.
- you can use types instead of numbers.
Keywords: begin — do — else — end — for — if — repeat — then — until — while
