Answer to Question #243459 in C# for Gayatri

Question

3. Given a string and substring, write a method that returns number of occurrences of substring in the string. Assume that both are case-sensitive. You may need to use library function here.

Expected input and output

HowManyOccurrences("do it now", "do") → 1

HowManyOccurrences("empty", "d") → 0

4. Write a program in C# Sharp to count a total number of duplicate elements in an array.

Test Data :

Input the number of elements to be stored in the array :3

Input 3 elements in the array

Answer 1

// 3.
using System;
using System.Collections.Generic;

namespace ConsoleApplication1
{
    internal class Program
    {
        public static int HowManyOccurrences(string str, string sub)
        {
            var count = 0;
            var flag = false;
            for (var i = 0; i < str.Length; i++)
            {
                var ch = str[i];
                if (ch == sub[0])
                {
                    for (var j = 1; j < sub.Length; j++)
                        if (i + j < str.Length)
                            if (str[i + j] != sub[j])
                            {
                                flag = true;
                                break;
                            }
                    if (!flag)
                        count++;
                }
                flag = false;
            }

            return count;
        }
        public static void Main(string[] args)
        {
            Console.WriteLine(HowManyOccurrences("This is sample sentenceis", "is"));
            Console.WriteLine(HowManyOccurrences("empty", "d"));
        }
    }
}
// 4.
using System;
using System.Collections.Generic;

namespace ConsoleApplication1
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            int[] arr = new int[100];
            int i, j, num, count = 0;
 
            Console.WriteLine("Input the number of elements to be stored in the array : ");
            num = Convert.ToInt32(Console.ReadLine());
 
            Console.WriteLine($"Input {num} elements in the array: ");
            for (i = 0; i < num; i++)
            {
                arr[i] = Convert.ToInt32(Console.ReadLine());           
            }
 
            for (i = 0; i < num; i++)
            {
                for (j = i + 1; j < num; j++)
                {
                    if (arr[i] == arr[j])
                    {
                        count++;
                        break;
                    }
                }
            }
 
            Console.WriteLine("\n Total number of duplicate elements found in array:"+count);
            Console.ReadLine();
        }
    }
}