A string is a set of characters. String are enclosed in double-quotes.
Example:
"hello geek","java","python" etc
Example: LISP program to display strings
Lisp
;edisplay hello geek (write - line "Hello Geek" )
;display (write - line "Welcome to java" )
|
Output:
Hello Geek Welcome to java
String Comparison Functions:
Used to compare two strings. Further they can be divided into two categories. They are
Case Sensitive Functions:
These functions can be represented by mathematical symbols.
Symbol | Name | Syntax | Description |
---|---|---|---|
= | equal to | string= | This operator checks if the values of the operands are all equal or not, if yes then the condition becomes true(T). otherwise it returns NIL |
/= | not equal to | string/= | This operator checks if the values of the operands are all different or not, if values are not equal then the condition becomes true(T). otherwise, it returns NIL |
> | greater than | string> | This operator checks if the values of the operands are monotonically increasing. |
< | less than | string< | This operator checks if the values of the operands are monotonically decreasing. |
>= | greater than or equal to | string>= | This operator checks if the value of any left operand is less than or equal to the value of its right operand, if yes then the condition becomes true. |
<= | less than or equal to | string<= | This operator checks if the value of any left operand is greater than or equal to the value of the next right operand, if yes then the condition becomes true. |
Example: LISP program that demonstrates string case sensitive functions
Lisp
; case - sensitive comparison - equal to
(write (string = "Hello Geeks" "Hello Geeks" ))
;new line (terpri) ; case - sensitive comparison - equal to
(write (string = "Hello Geeks" "HelloGeeks" ))
;new line (terpri) ; case - sensitive comparison - not equal to
(write (string / = "Hello Geeks" "Hello Geeks" ))
;new line (terpri) ; case - sensitive comparison - not equal to
(write (string / = "Hello Geeks" "HelloGeeks" ))
;new line (terpri) ; case - sensitive comparison - greater than
(write (string> "Hello Geeks" "Python" ))
;new line (terpri) ; case - sensitive comparison - less than
(write (string< "Hello Geeks" "java" ))
;new line (terpri) ; case - sensitive comparison - greater than or equal to
(write (string> = "Hello Geeks" "Python" ))
;new line (terpri) ; case - sensitive comparison - less than or equal to
(write (string< = "Hello Geeks" "java" ))
;new line (terpri) |
Output:
T NIL NIL 5 NIL 0 NIL 0
Case INSENSITIVE FUNCTIONS
These functions can be represented by expressions.
Name | Syntax | Description |
---|---|---|
equal | string-equal | This operator checks if the values of the operands are all equal or not, if yes then the condition becomes true(T). Otherwise, it returns NIL |
not equal | string-not-equal | This operator checks if the values of the operands are all different or not, if values are not equal then the condition becomes true(T). Else, it returns NIL |
greater than | string-greaterp | This operator checks if the values of the operands are monotonically increasing. |
less than | string-lessp | This operator checks if the values of the operands are monotonically decreasing. |
greater than or equal to | string-not-lessp | This operator checks if the value of any left operand is less than or equal to the value of its right operand, if yes then the condition becomes true. |
less than or equal to | string-not-greaterp | This operator checks if the value of any left operand is greater than or equal to the value of the next right operand, if yes then the condition becomes true. |
Example: Lisp program that demonstrates case insensitive functions
Lisp
; case - sensitive comparison - equal to
(write (string - equal "Hello Geeks" "Hello Geeks" ))
;new line (terpri) ; case - sensitive comparison - equal to
(write (string - equal "Hello Geeks" "HelloGeeks" ))
;new line (terpri) ; case - sensitive comparison - not equal to
(write (string - not - equal "Hello Geeks" "Hello Geeks" ))
;new line (terpri) ; case - sensitive comparison - not equal to
(write (string - not - equal "Hello Geeks" "HelloGeeks" ))
;new line (terpri) ; case - sensitive comparison - greater than
(write (string - greaterp "Hello Geeks" "Python" ))
;new line (terpri) ; case - sensitive comparison - less than
(write (string - lessp "Hello Geeks" "java" ))
;new line (terpri) ; case - sensitive comparison - greater than or equal to
(write (string - not - lessp "Hello Geeks" "Python" ))
;new line (terpri) ; case - sensitive comparison - less than or equal to
(write (string - not - greaterp "Hello Geeks" "java" ))
;new line (terpri) |
Output:
T NIL NIL 5 NIL 0 NIL 0
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