This method is used to indicates whether the Char object at the specified position in a string is a low surrogate or not. Syntax:
public static bool IsLowSurrogate (string s, int index);
Parameters:
s: It is a String. index: It is the character position to evaluate in s.
Return Value: This method returns true if the numeric value of the specified character in the s parameter ranges from U+DC00 through U+DFFF otherwise it returns false. Exceptions:
- ArgumentNullException: If the s is null.
- ArgumentOutOfRangeException: If the index is not a position within s.
Below programs illustrate the use of Char.IsLowSurrogate(String, Int32) Method: Example 1:
// C# program to demonstrate // Char.IsLowSurrogate(String, // Int32) Method using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling check() Method
check("1234", 3);
check("Tsunami", 3);
check("psyc0lo", 4);
// declaring and initializing string s1
string s1 = new String( new char [] { 'a' ,
'\uD800' , '\uDC00' , 'z' });
check(s1, 2);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining check() method
public static void check( string s, int i)
{
// checking condition
// using IsLowSurrogate() Method
bool val = Char.IsLowSurrogate(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains Low "
+ "Surrogate value at index {1} ", s, i);
else
Console.WriteLine("String '{0}' doesn't contain any Low"
+ "Surrogate value at index {1}", s, i);
}
} |
String '1234' does't contain any LowSurrogate value at index 3 String 'Tsunami' does't contain any LowSurrogate value at index 3 String 'psyc0lo' does't contain any LowSurrogate value at index 4 String 'að??z' contains Low Surrogate value at index 2
Example 2: For ArgumentNullException
// C# program to demonstrate // Char.IsLowSurrogate(String, // Int32) Method using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling check() Method
check("1234", 3);
check("Tsunami", 3);
check("psyc0lo", 4);
// declaring and initializing string s1
string s1 = new String( new char [] { 'a' ,
'\uD800' , '\uDC00' , 'z' });
check(s1, 2);
Console.WriteLine("");
Console.WriteLine("s is null ");
check( null , 4);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining check() method
public static void check( string s, int i)
{
// checking condition
// using IsLowSurrogate() Method
bool val = Char.IsLowSurrogate(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains Low "
+ "Surrogate value at index {1} ",s, i);
else
Console.WriteLine("String '{0}' doesn't contain any Low"
+ "Surrogate value at index {1}",s, i);
}
} |
String '1234' does't contain any LowSurrogate value at index 3 String 'Tsunami' does't contain any LowSurrogate value at index 3 String 'psyc0lo' does't contain any LowSurrogate value at index 4 String 'að??z' contains Low Surrogate value at index 2 s is null Exception Thrown: System.ArgumentNullException
Example 3: For ArgumentOutOfRangeException
// C# program to demonstrate // Char.IsLowSurrogate(String, // Int32) Method using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling check() Method
check("1234", 3);
check("Tsunami", 3);
check("psyc0lo", 4);
// declaring and initializing string s1
string s1 = new String( new char [] { 'a' ,
'\uD800' , '\uDC00' , 'z' });
check(s1, 2);
Console.WriteLine("");
Console.WriteLine("index is less than zero");
check(" null ", -4);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining check() method
public static void check( string s, int i)
{
// checking condition
// using IsLowSurrogate() Method
bool val = Char.IsLowSurrogate(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains Low "
+ "Surrogate value at index {1} ",s, i);
else
Console.WriteLine("String '{0}' doesn't contain any Low"
+ "Surrogate value at index {1}",s, i);
}
} |
String '1234' does't contain any LowSurrogate value at index 3 String 'Tsunami' does't contain any LowSurrogate value at index 3 String 'psyc0lo' does't contain any LowSurrogate value at index 4 String 'að??z' contains Low Surrogate value at index 2 index is less than zero Exception Thrown: System.ArgumentOutOfRangeException
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