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1) Electricity Bill:String Input1=AAAAA12345;String
Input2=AAAAA23456;int
Input3=4;UserMainCode(Input1,Input2,Input3)Logic :
Output1=(Input1-Input2)*Input3using System;using
System.Collections.Generic;using System.Linq;using
System.Text;namespace ConsoleApplication36{ class Program { static
void Main(string[] args) { Console.WriteLine("enter a string1");
string input1 = Console.ReadLine(); Console.WriteLine("enter
string2"); string input2 = Console.ReadLine();
Console.WriteLine("enter string3"); int input3 =
int.Parse(Console.ReadLine()); int output1=0; StringBuilder sb =
new StringBuilder(); StringBuilder sb1 = new StringBuilder();
foreach (char ch in input1) { if (char.IsDigit(ch)) {
sb.Append(ch); } } foreach (char c in input2) { if
(char.IsDigit(c)) { sb1.Append(c); } } string r = sb.ToString();
string re = sb1.ToString(); int n = int.Parse(r); int k =
int.Parse(re); if (n > k) { output1 = (n - k) * input3; } else {
output1 = (k - n) * input3; } Console.WriteLine(output1);
Console.Read(); }
}}------------------------------------------------------------------------------------------------------------------------------------------------------------
2)Count vowels in a given stringusing System;using
System.Collections.Generic;using System.Linq;using
System.Text;namespace ConsoleApplication36{ class Program { static
void Main(string[] args) { Console.WriteLine("enter a string:");
string input1 = Console.ReadLine(); char[] ch =
input1.ToCharArray(); int count = 0; foreach (var i in ch) { if (i
>= 'a' && i
