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C# String.IndexOf( ) Method
The String.IndexOf() method in C# is used to find the zero-based index of the first occurrence of a specified Unicode character or string within this instance.
Syntax
The syntax is as follows −
public int IndexOf (string val);
Above, val is the string to find.
Example
Let us now see an example −
using System; public class Demo { public static void Main(String[] args) { string str1 = "Jacob"; string str2 = "John"; Console.WriteLine("String 1 = "+str1); Console.WriteLine("HashCode of String 1 = "+str1.GetHashCode()); Console.WriteLine("Index of character 'o' is str1 = " + str1.IndexOf("o")); Console.WriteLine("
String 2 = "+str2); Console.WriteLine("HashCode of String 2 = "+str2.GetHashCode()); Console.WriteLine("Index of character 'o' is str2 =" + str2.IndexOf("o")); bool res = str1.Contains(str2); if (res) Console.WriteLine("Found!"); else Console.WriteLine("Not found!"); } }
Output
This will produce the following output −
String 1 = Jacob HashCode of String 1 = -790718923 Index of character 'o' is str1 = 3 String 2 = John HashCode of String 2 = -1505962600 Index of character 'o' is str2 =1 Not found!
Example
Let us now see another example −
using System; public class Demo { public static void Main(String[] args) { string str1 = "Kevin"; string str2 = "Evin"; Console.WriteLine("String 1 = "+str1); Console.WriteLine("HashCode of String 1 = "+str1.GetHashCode()); Console.WriteLine("Index of character 'k' in str1 = " + str1.IndexOf("k")); Console.WriteLine("
String 2 = "+str2); Console.WriteLine("HashCode of String 2 = "+str2.GetHashCode()); Console.WriteLine("Index of character 'k' in str2 =" + str2.IndexOf("k")); bool res = str1.Contains(str2); if (res) Console.WriteLine("Found!"); else Console.WriteLine("Not found!"); } }
Output
This will produce the following output −
String 1 = Kevin HashCode of String 1 = -768104063 Index of character 'k' in str1 = -1 String 2 = Evin HashCode of String 2 = 1223510568 Index of character 'k' in str2 =-1 Not found!
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