The Ring programming language version 1.9 book - Part 30 of 210

1. CHAPTER
THIRTYONE
STRINGS
In this chapter we are going to learn about strings creation and manipulation.
31.1 String Literals
Syntax:
cStr = "This is a string"
cStr2 = 'Another string'
cStr3 = :JustAnotherString
cStr4 = `Yet "another" 'string' ! `
31.2 Get String Length
We can get the string length (letters count inside a string) using the len() function
Syntax:
len(string) ---> string length
Example:
cStr = "How are you?"
see cStr + nl
see "String size : " + len(cStr) + nl
31.3 Convert Letters Case
Syntax:
lower(string) ---> convert string letters to lower case
upper(string) ---> convert string letters to UPPER case
Example:
cStr = "Welcome To The Ring Programming Language"
see cStr + nl + upper(cStr) + nl + lower(cStr)
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31.4 Access String Letters
We can access a letter inside a string by the letter index
Syntax:
string[index] ---> get string letter
string[index] = letter # set string letter
Example:
# print user name letter by letter (each letter in new line)
See "Hello, Enter your name : " give cName
for x = 1 to len(cName)
see nl + cName[x]
next
We can use for in to get string letters.
Example:
# print user name letter by letter (each letter in new line)
See "Hello, Enter your name : " give cName
for x in cName
see nl + x
next
We can modify the string letters
Example:
# convert the first letter to UPPER case
See "Enter your name : " give cName
cName[1] = upper(cName[1])
see "Hello " + cName
31.5 Left() Function
We can get a specified number of characters from a string using the Left() function.
The starting position is 1.
Syntax:
Left(string,count)
Example:
see left("Hello World!",5) # print Hello
31.6 Right() Function
We can get a specified number of characters from a string using the Right() function.
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The starting position is the last character on the right.
Syntax:
Right(string,count)
Example:
see Right("Hello World!",6) # print World!
31.7 Trim() Function
We can remove all leading and trailing spaces from a string using the Trim() function.
Syntax:
trim(string)
Example:
cMsg = " Welcome "
see trim(cMsg) # print Welcome
31.8 Copy() Function
We can duplicate a string more than one time using the copy() function.
Syntax:
copy(string,nCount) ---> string replicated nCount times
Example
see copy("***hello***",3) # print ***hello******hello******hello***
31.9 Lines() Function
We can count the number of lines inside a string using the Lines() function.
Syntax:
lines(string) ---> Number of lines inside the string
Example:
cStr = "Hello
How are you?
are you fine?"
see lines(cStr) # print 3
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31.10 Substr() Function
We can work on sub strings inside a string using the substr() function. Using Substr() we can
• Find substring
• Get substring from position to end
• Get Number of characters from position
• Transform Substring To Another Substring
31.11 Find substring
Syntax:
substr(string,substring) ---> the starting position of substring in string
Example:
cStr = "Welcome to the Ring programming language"
see substr(cStr,"Ring") # print 16
31.12 Get substring from position to end
Syntax:
substr(string,position) ---> Get substring starting from position to end
Example:
cStr = "Welcome to the Ring programming language"
nPos = substr(cStr,"Ring") # nPos = 16
see substr(cStr,nPos) # print Ring programming language
31.13 Get Number of Characters From Position
Syntax:
substr(string,position,count) ---> Get characters starting from position
Example:
cStr = "Welcome to the Ring programming language"
nPos = substr(cStr,"Ring") # nPos = 16
see substr(cStr,nPos,4) # print Ring
31.14 Transform Substring To Another Substring
Syntax:
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substr(string,substring,newsubstring) ---> Transformed string (Match case)
substr(string,substring,newsubstring,1) ---> Transformed string (Ignore case)
Example:
cStr = "Welcome to the New programming language"
see substr(cStr,"New","Ring") + nl # print Welcome to the Ring programming language
see substr(cStr,"new","Ring",1)+ nl # print Welcome to the Ring programming language
31.15 strcmp() Function
We can compare between two strings using the strcmp() function.
Syntax:
strcmp(cString1,cString2) ---> value = 0 if cString1 = cString2
value < 0 if cString1 < cString2
value > 0 if cString1 > cString2
Example:
see strcmp("hello","hello") + nl +
strcmp("abc","bcd") + nl +
strcmp("bcd","abc") + nl
Output:
0
-1
1
31.16 str2list() and list2str() Functions
We can convert string lines to list items using the str2list() function. Also we can convert the list to a string using
list2str() function.
Syntax:
str2list(string) ---> list contains the string lines
list2str(list) ---> string contains the list items
Example:
/* output:
** Items : 4
** Item : Hello
** Item : How are you ?
** Item : are you fine ?
** Item : ok
** list2Str result = Hello
** How are you ?
** are you fine ?
** ok
** Done
*/
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mystr = "Hello
How are you ?
are you fine ?
ok"
mylist = str2list(mystr)
see "Items : " + len(mylist) + nl
for x in mylist
see "Item : " + x + nl
next
newstr = list2str(mylist)
see "list2Str result = " + newstr
if mystr = newstr
see nl + "Done"
else
see nl + "Error!"
ok
31.17 Merge binary characters
From Ring 1.0 we can create binary strings and do operations on these strings.
Starting from Ring 1.8, we can get individual characters from these strings and merge them together using the ‘+’
operator.
Example:
cStr = "Welcome"
? cstr[1] + cstr[2] + cStr[5]
v = cstr[1] + cstr[2] + cStr[5]
? v
? len(v)
c1 = cStr[1]
? c1
aList = [1,2,3]
cStr = ""
for item in aList
cStr += int2bytes(item)
next
? "All String"
? len(cStr)
? "First Part"
n1 = cStr[1] + cStr[2] + cStr[3] + cStr[4]
? len(n1)
? "Second Part"
n2 = cStr[5] + cStr[6] + cStr[7] + cStr[8]
? len(n2)
? "Third Part"
n3 = cStr[9] + cStr[10] + cStr[11] + cStr[12]
? len(n3)
? "All String"
cString = cStr[1] + cStr[2] + cStr[3] + cStr[4] +
cStr[5] + cStr[6] + cStr[7] + cStr[8] +
cStr[9] + cStr[10] + cStr[11] + cStr[12]
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? len(cString)
? ascii(cStr[1])
? len(cStr[2])
Output:
Weo
Weo
3
W
All String
12
First Part
4
Second Part
4 }
Third Part
4
All String
12
1
1
31.17. Merge binary characters 265

8. CHAPTER
THIRTYTWO
DATE AND TIME
In this chapter we are going to learn about the date and time functions.
32.1 Clock() Function
Syntax:
Clock() ---> The number of clock ticks from program start
Example:
See "Calculate performance" + nl
t1 = clock()
for x = 1 to 1000000 next
see clock() - t1
32.2 ClocksPerSecond() Function
Return how many clocks in one second
Syntax:
clockspersecond() ---> Number of clocks in one second
Example:
# Wait 1 second
t = clock()
while clock() - t <= clockspersecond() end
32.3 Time() Function
We can get the system time using the Time() function.
Example:
See "Time : " + time()
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32.4 Date() Function
We can get the date using the Date() function.
Syntax:
Date() ---> String represent the date "dd/mm/yyyy"
Example:
See "Date : " + date() # Date : 24/05/2015
32.5 TimeList() Function
We can print the date and the time information using the TimeList() function.
Syntax:
TimeList() ---> List contains the time and date information.
The next table presents the list items
index value
1 abbreviated weekday name
2 full weekday name
3 abbreviated month name
4 full month name
5 Date & Time
6 Day of the month
7 Hour (24)
8 Hour (12)
9 Day of the year
10 Month of the year
11 Minutes after hour
12 AM or PM
13 Seconds after the hour
14 Week of the year (sun-sat)
15 day of the week
16 date
17 time
18 year of the century
19 year
20 time zone
21 percent sign
Example:
/* Output:
** Sun abbreviated weekday name
** Sunday full weekday name
** May abbreviated month name
** May full month name
** 05/24/15 09:58:38 Date & Time
** 24 Day of the month
** 09 Hour (24)
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** 09 Hour (12)
** 144 Day of the year
** 05 Month of the year
** 58 Minutes after hour
** AM AM or PM
** 38 Seconds after the hour
** 21 Week of the year (sun-sat)
** 0 day of the week
** 05/24/15 date
** 09:58:38 time
** 15 year of the century
** 2015 year
** Arab Standard Time time zone
** % percent sign
*/
See TimeList()
Example:
See "Day Name : " + TimeList()[2] # Sunday
Example:
See "Month Name : " + TimeList()[4] # May
32.6 AddDays() Function
Syntax:
AddDays(cDate,nDays) ---> Date from cDate and after nDays
Example:
cDate = date()
see cDate + nl # 24/05/2015
cDate = adddays(cDate,10)
see cDate + nl # 03/06/2015
32.7 DiffDays() Function
Syntax:
DiffDays(cDate1,cDate2) ---> number of days (Date1 - Date2)
Example:
cDate1 = date()
see cDate1 + nl # 24/05/2015
cDate2 = adddays(cDate1,10)
see cDate2 + nl # 03/06/2015
see "DiffDays = " + diffdays(cDate1,cDate2) + nl # -10
see "DiffDays = " + diffdays(cDate2,cDate1) + nl # 10
32.6. AddDays() Function 268