C# program to check whether a given string is Heterogram or not

Heterogram for a string means the string isn’t having duplicate letters. For example −

Mobile Cry Laptop

Loop through each word of the string until the length of the string −

for (int i = 0; i < len; i++) {    if (val[str[i] - 'a'] == 0)    val[str[i] - 'a'] = 1;    else    return false; }

Above, len is the length of the string.

Let us see the complete code −

Example

 Live Demo

using System; public class GFG {    static bool checkHeterogram(string str, int len) {       int []val = new int[26];       for (int i = 0; i < len; i++) {          if (val[str[i] - 'a'] == 0)          val[str[i] - 'a'] = 1;          else          return false;       }       return true;    }    public static void Main () {       string str = "mobile";       // length of the entered string       int len = str.Length;       if(checkHeterogram(str, len))       Console.WriteLine("String is Heterogram!");       else       Console.WriteLine("String is not a Heterogram!");    } }

Output

String is Heterogram!