├── .gitignore
├── Program.cs
└── learningString.csproj


/.gitignore:
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1 | /bin
2 | /obj


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/Program.cs:
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 1 | using System;
 2 | 
 3 | namespace learningString
 4 | {
 5 |     class Program
 6 |     {
 7 |         static void Main(string[] args)
 8 |         {
 9 |         //    Console.WriteLine("Enter a string to Reverse : "); 
10 |         //    string r = Console.ReadLine();
11 |         //    reverseString rs = new reverseString();
12 |         //    string ans = rs.Reverse(r);
13 |         //    Console.WriteLine("Reversed string is : " + ans);
14 | 
15 |             Console.WriteLine("Enter First Number :");
16 |             string snum1 = Console.ReadLine();
17 |             Console.WriteLine("Enter Second Number :");
18 |             string snum2 = Console.ReadLine();
19 |             Console.WriteLine("Enter Operator : ");
20 |             string op = Console.ReadLine();
21 |             int num1 = int.Parse(snum1);
22 |             int num2 = int.Parse(snum2);
23 |             Calculator cal = new Calculator();
24 |             if(op == "+")
25 |             {
26 |                 Console.WriteLine("Result is : " + cal.add(num1, num2));
27 |             }
28 |             else if(op == "-")
29 |             {
30 |                 Console.WriteLine("Result is : " + cal.sub(num1, num2));
31 |             }
32 |             else if(op == "*")
33 |             {
34 |                 Console.WriteLine("Result is : " + cal.mul(num1, num2));
35 |             }
36 |             else if(op == "/")
37 |             {
38 |                 Console.WriteLine("Result is : " + cal.div(num1, num2));
39 |             }
40 |             else
41 |             {
42 |                 Console.WriteLine("Invalid Operator");
43 |             }
44 |         }
45 |     }
46 | 
47 |     //write a class to reverse a atring
48 |     public class reverseString
49 |     {
50 |         public string Reverse(string str)
51 |         {
52 |             string result = "";
53 |             for (int i = str.Length - 1; i >= 0; i--)
54 |             {
55 |                 result += str[i];
56 |             }
57 |             return result;
58 |         }
59 |     }
60 | 
61 |     //create a class of basic calculator
62 |     public class Calculator 
63 |     {
64 |         public int add(int a, int b)
65 |         {
66 |             return a + b;
67 |         }
68 |         public int sub(int a, int b)
69 |         {
70 |             return a - b;
71 |         }
72 |         public int mul(int a, int b)
73 |         {
74 |             return a * b;
75 |         }
76 |         public int div(int a, int b)
77 |         {
78 |             return a / b;
79 |         }
80 |     }
81 | 
82 | }
83 | 


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/learningString.csproj:
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1 | <Project Sdk="Microsoft.NET.Sdk">
2 | 
3 |   <PropertyGroup>
4 |     <OutputType>Exe</OutputType>
5 |     <TargetFramework>net5.0</TargetFramework>
6 |   </PropertyGroup>
7 | 
8 | </Project>
9 | 


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