Thread Rating:
  • 304 Vote(s) - 2.65 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Page 7: Summary
06-20-2011, 01:23 PM, (This post was last modified: 06-23-2011, 04:27 PM by ashimo.)
#1
Page 7: Summary
TRY 5 Summary

Reading and writing data from/to a file

Step 1. Specifying the location of a file

Code:
let location_variable_name:Url = {url “path to file location”}

Step 2. Opening file as a Stream

  • TextInputStream (read)
  • TextOutputStream (write)

Code:
let stream_variable_name:TextInputStream = {read-open location_variable_name}
let stream_variable_name:TextOutputStream = {write-open location_variable_name}

Step 3. Using methods to read or write data
  • Methods such as read-line or write-one-string

Step 4. Closing the file

Code:
{if-non-null stream_variable_name then
    {stream_variable_name.close}
}

Repeat Expressions

until expression (processing repeats until conditional expression is true)

Code:
{until conditional_expression do
    body
}

for expression (specifying a range)

Code:
{for repeat variable:int = initial_value to final_value step step_size value do
    body
}

As well as to, there are also the below, downto, and above keywords. The step_size can be omitted when the desired step_size is 1.

for expression (repeats only the values among the elements of a collection, such as an array)

Code:
{for element_variable:element_type key key_variable[:key type] in (collection) name do
    processing
}

Note that element_variable:Element_type or key key_variable: key_type can be omitted.

Exception Processing

Code:
{try
    Processing in which an exception may occur.
catch exception_variable_name: exception
    Exception Processing
finally
    Processing that must be performed regardless of whether an exception occurs
}

The catch and finally clauses can be omitted. Also, each try can be declared more than once.
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Page 8: Extra Practice ashimo 0 3,482 06-20-2011, 01:34 PM
Last Post: ashimo
  Page 6: Structure of a Program that Reads our Score Data ashimo 0 2,970 06-20-2011, 01:21 PM
Last Post: ashimo
  Page 5: Application: Reading Our Score Data ashimo 0 2,775 06-20-2011, 01:20 PM
Last Post: ashimo
  Page 4: Structure of a Program that Writes Data to a File ashimo 0 3,148 06-20-2011, 01:18 PM
Last Post: ashimo
  Page 3: Basics 2: Writing a Control Value into a File ashimo 0 3,022 06-20-2011, 01:16 PM
Last Post: ashimo
  Page 2: Structure of a Program that Reads Data from a File ashimo 0 3,039 06-20-2011, 01:13 PM
Last Post: ashimo
  Page 1: Reading Our Score Data ashimo 0 3,171 06-20-2011, 01:12 PM
Last Post: ashimo
Forum Jump:


Users browsing this thread:
1 Guest(s)

MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1017 - Can't find file: 'mybb_threadviews' (errno: 2)
Query:
INSERT INTO mybb_threadviews (tid) VALUES('77')