The Ring programming language version 1.5.1 book - Part 34 of 180

1. CHAPTER
FORTYTHREE
STDLIB CLASSES
In this chapter we are going to learn about the classes in the stdlib.ring
• StdBase Class
• String Class
• List Class
• Stack Class
• Queue Class
• HashTable Class
• Tree Class
• Math Class
• DateTime Class
• File Class
• System Class
• Debug Class
• DataType Class
• Conversion Class
• ODBC CLass
• MySQL Class
• SQLite Class
• Security Class
• Internet Class
43.1 StdBase Class
Attributes:
• vValue : Object Value
Methods:
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2. Ring Documentation, Release 1.5.1
Method Description/Output
Init(x) Set vValue Attribute to x value
Print() Print vValue
PrintLn() Print vValue then New Line
Size() return number represent the size of vValue
Value() return vValue
Set(x) Call Init(x)
43.2 String Class
Parent Class : StdBase Class
Methods:
Method Description/Output
Init(String|Number|List)
Lower() New String - Lower case characters
Upper() New String - Upper case characters
Left(x) New String - contains x characters from the left
Right(x) New String - contains x characters from the right
Lines() Number - Lines count
Trim() New String - Remove Spaces
Copy(x) New String - repeat string x times
strcmp(cString) Compare string with cString
tolist() List (String Lines to String Items)
tofile(cFileName) Write string to file
mid(nPos1,nPos2) New String - from nPos1 to nPos2
getfrom(nPos1) New String - from nPos1 to the end of the string
replace(cStr1,cStr2,lCase) New String - Replace cStr1 with cStr2 , lCase (True=Match Case)
split() List - Each Word as list item
startswith(substring) Return true if the start starts with a substring
endswith(substring) Return true if the start ends with a substring
Example:
Load "stdlib.ring"
See "Testing the String Class" + nl
oString = new string("Hello, World!")
oString.println()
oString.upper().println()
oString.lower().println()
oString.left(5).println()
oString.right(6).println()
oString = new string("Hi" + nl + "Hello" )
See oString.lines() + nl
oString = new string(" Welcome ")
oString.println()
oString.trim().println()
oString = new string("Hello! ")
oString.copy(3).println()
see oString.strcmp("Hello! ") + nl
see oString.strcmp("Hello ") + nl
see oString.strcmp("Hello!! ") + nl
oString = new string(["one","two","three"])
43.2. String Class 306

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oString.print()
see oString.lines() + nl
oString = new String(1234)
oString.println()
oString = new String("one"+nl+"two"+nl+"three")
aList = oString.tolist()
see "List Items" + nl See aList
oString = new String( "Welcome to the Ring programming language")
See "the - position : " + oString.pos("the") + nl
oString = oString.getfrom(oString.pos("Ring"))
oString.println()
oString.mid(1,4).println()
oString = oString.replace("Ring","***Ring***",true)
oString.println()
oString = oString.replace("ring","***Ring***",false)
oString.println()
oString1 = new string("First")
oString2 = new string("Second")
oString = oString1 + oString2
oString.println()
oString = oString1 * 3
oString.println()
for t in ostring see t next
oString.tofile("test.txt")
oString = new string("one two three")
see nl
see ostring.split()
oString {
set("Hello") println()
set("How are you?") println()
}
Output:
Testing the String Class
Hello, World!
HELLO, WORLD!
hello, world!
Hello
World!
2
Welcome
Welcome
Hello! Hello! Hello!
0
1
-1
one
two
three
4
1234
List Items
one
two
three
the - position : 12
Ring programming language
43.2. String Class 307

4. Ring Documentation, Release 1.5.1
Ring
***Ring*** programming language
******Ring****** programming language
FirstSecond
FirstFirstFirst
FirstFirstFirst
one
two
three
Hello
How are you?
43.3 List Class
Parent Class : StdBase Class
Methods:
Method Description/Output
Init(String|List)
Add(Value) Add item to the list
Delete(nIndex) Delete item from the list
Item(nIndex) Get item from the list
First() Get the first item in the list
Last() Get the last item in the list
Set(nIndex,Value) Set item value
FindInColumn(nCol,Value) Find item in a column
Sort() Sort items - return new list
Reverse() Reverse items - return new list
Insert(nIndex,Value) Inset Item after nIndex
example:
Load "stdlib.ring"
oList = new list ( [1,2,3] )
oList.Add(4)
oList.print()
see oList.item(1) + nl
oList.delete(4)
oList.print()
see oList.first() + nl
see oList.last() + nl
oList { set(1,"one") set(2,"two") set(3,"three") print() }
see oList.find("two") + nl
oList.sort().print()
oList.reverse().print()
oList.insert(2,"nice")
oList.print()
oList = new list ( [ [1,"one"],[2,"two"],[3,"three"] ] )
see copy("*",10) + nl
oList.print()
see "Search two : " + oList.findincolumn(2,"two") + nl
see "Search 1 : " + oList.findincolumn(1,1) + nl
oList = new list ( [ "Egypt" , "USA" , "KSA" ] )
for x in oList
43.3. List Class 308

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see x + nl
next
oList = new list ( [1,2,3,4] )
oList + [5,6,7]
oList.print()
oList = new list ( ["one","two"] )
oList2 = new list ( ["three","four"] )
oList + oList2
oList.print()
output:
1
2
3
4
1
1
2
3
1
3
one
two
three
2
one
three
two
three
two
one
one
two
nice
three
**********
1
one
2
two
3
three
Search two : 2
Search 1 : 1
Egypt
USA
KSA
1
2
3
4
5
6
7
one
two
three
43.3. List Class 309

6. Ring Documentation, Release 1.5.1
four
43.4 Stack Class
Parent Class : List Class
Methods:
Method Description/Output
Init(String|Number|List)
Push(Value) Push item to the stack
Pop() Pop item from the stack
Print() Print the stack items
example:
Load "stdlib.ring"
oStack = new Stack
oStack.push(1)
oStack.push(2)
oStack.push(3)
see oStack.pop() + nl
see oStack.pop() + nl
see oStack.pop() + nl
oStack.push(4)
see oStack.pop() + nl
oStack { push("one") push("two") push("three") }
oStack.print()
output:
3
2
1
4
three
two
one
43.5 Queue Class
Parent Class : List Class
Methods:
Method Description/Output
Init(String|Number|List)
Remove() Remove item from the Queue.
example:
Load "stdlib.ring"
oQueue = new Queue
oQueue.add(1)
43.4. Stack Class 310

7. Ring Documentation, Release 1.5.1
oQueue.add(2)
oQueue.add(3)
see oQueue.remove() + nl
see oQueue.remove() + nl
see oQueue.remove() + nl
oQueue.add(4)
see oQueue.remove() + nl
oQueue { add("one") add("two") add("three") }
oQueue.print()
output:
1
2
3
4
one
two
three
43.6 HashTable Class
Parent Class : List Class
Methods:
Method Description/Output
Init(List)
Add(cKey,Value) Add item to the HashTable
Set(cKey,Value) Set item value using the Key
GetValue(cKey) Get item value using the Key
Contains(cKey) Check if the HashTable contains item using the Key
Index(cKey) Get the item index using the Key
example:
Load "stdlib.ring"
ohashtable = new hashtable
See "Test the hashtable Class Methods" + nl
ohashtable {
Add("Egypt","Cairo")
Add("KSA","Riyadh")
see self["Egypt"] + nl
see self["KSA"] + nl
see contains("Egypt") + nl
see contains("USA") + nl
see index("KSA") + NL
print()
delete(index("KSA"))
see copy("*",60) + nl
print()
}
output:
43.6. HashTable Class 311

8. Ring Documentation, Release 1.5.1
Test the hashtable Class Methods
Cairo
Riyadh
1
0
2
Egypt
Cairo
KSA
Riyadh
************************************************************
Egypt
Cairo
43.7 Tree Class
Data:
Attribute Description
Data Node Value
Children Children List
Methods:
Method Description/Output
set(value) Set the node value.
value() Get the node value.
Add(value) Add new child.
parent() Get the parent node.
print() Print the tree nodes.
example:
Load "stdlib.ring"
otree = new tree
See "Test the tree Class Methods" + nl
otree {
set("The first step") # set the root node value
see value() + nl
Add("one")
Add("two")
Add("three") {
Add("3.1")
Add("3.2")
Add("3.3")
see children
}
see children
oTree.children[2] {
Add("2.1") Add("2.2") Add("2.3") {
Add("2.3.1") Add("2.3.2") Add("test")
}
}
oTree.children[2].children[3].children[3].set("2.3.3")
}
43.7. Tree Class 312

9. Ring Documentation, Release 1.5.1
see copy("*",60) + nl
oTree.print()
output:
Test the tree Class Methods
The first step
data: 3.1
parent: List...
children: List...
data: 3.2
parent: List...
children: List...
data: 3.3
parent: List...
children: List...
data: one
parent: List...
children: List...
data: two
parent: List...
children: List...
data: three
parent: List...
children: List...
************************************************************
one
two
2.1
2.2
2.3
2.3.1
2.3.2
2.3.3
three
3.1
3.2
3.3
43.8 Math Class
Methods:
43.8. Math Class 313

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Method Description
sin(x) Returns the sine of an angle of x radians
cos(x) Returns the cosine of an angle of x radians
tan(x) Returns the tangent of an angle of x radians
asin(x) Returns the principal value of the arc sine of x, expressed in radians
acos(x) Returns the principal value of the arc cosine of x, expressed in radians
atan(x) Returns the principal value of the arc tangent of x, expressed in radians
atan2(y,x) Returns the principal arc tangent of y/x, in the interval [-pi,+pi] radians
sinh(x) Returns the hyperbolic sine of x radians
cosh(x) Returns the hyperbolic cosine of x radians
tanh(x) Returns the hyperbolic tangent of x radians
exp(x) Returns the value of e raised to the xth power
log(x) Returns the natural logarithm of x
log10(x) Returns the common logarithm (base-10 logarithm) of x
ceil(x) Returns the smallest integer value greater than or equal to x
floor(x) Returns the largest integer value less than or equal to x
fabs(x) Returns the absolute value of x.
pow(x,y) Returns x raised to the power of y
sqrt(x) Returns the square root of x
random(x) Returns a random number in the range [0,x]
unsigned(n,n,c) Perform operation using unsigned numbers
decimals(n) Determine the decimals digits after the point in float/double numbers
example:
Load "stdlib.ring"
oMath = new Math
See "Test the Math Class Methods" + nl
See "Sin(0) = " + oMath.sin(0) + nl
See "Sin(90) radians = " + oMath.sin(90) + nl
See "Sin(90) degree = " + oMath.sin(90*3.14/180) + nl
See "Cos(0) = " + oMath.cos(0) + nl
See "Cos(90) radians = " + oMath.cos(90) + nl
See "Cos(90) degree = " +oMath. cos(90*3.14/180) + nl
See "Tan(0) = " + oMath.tan(0) + nl
See "Tan(90) radians = " + oMath.tan(90) + nl
See "Tan(90) degree = " + oMath.tan(90*3.14/180) + nl
See "asin(0) = " + oMath.asin(0) + nl
See "acos(0) = " + oMath.acos(0) + nl
See "atan(0) = " + oMath.atan(0) + nl
See "atan2(1,1) = " +oMath. atan2(1,1) + nl
See "sinh(0) = " + oMath.sinh(0) + nl
See "sinh(1) = " + oMath.sinh(1) + nl
See "cosh(0) = " + oMath.cosh(0) + nl
See "cosh(1) = " + oMath.cosh(1) + nl
See "tanh(0) = " + oMath.tanh(0) + nl
See "tanh(1) = " + oMath.tanh(1) + nl
See "exp(0) = " + oMath.exp(0) + nl
See "exp(1) = " + oMath.exp(1) + nl
See "log(1) = " + oMath.log(1) + nl
43.8. Math Class 314