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C# | Design a simple calculator using if else if statements

C# if else if example: Here, we are going to design a simple calculator using if else if conditional statements in C#.
Submitted by Pankaj Singh, on December 25, 2018

The task is to design a simple calculator using if else if statements with following operations:

  1. Addition
  2. Subtraction
  3. Multiplication
  4. And, division

Program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DecisionMaking2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Calculator");
            Console.WriteLine("----------------------------");
            Console.WriteLine("1.Add");
            Console.WriteLine("2.Substract");
            Console.WriteLine("3.Multiply");
            Console.WriteLine("4.Divide");
            Console.Write("Enter Choice(1-4):");
            int ch = Int32.Parse(Console.ReadLine());
            int a, b, c;
            if(ch==1)
            {
                Console.Write("Enter A:");
                a = Convert.ToInt32(Console.ReadLine());
                Console.Write("Enter B:");
                b = Convert.ToInt32(Console.ReadLine());
                c = a + b;
                Console.WriteLine("Sum = {0}", c);
            }
            else if(ch==2)
            {
                Console.Write("Enter A:");
                a = Convert.ToInt32(Console.ReadLine());
                Console.Write("Enter B:");
                b = Convert.ToInt32(Console.ReadLine());
                c = a - b;
                Console.WriteLine("Difference = {0}", c);
            }
            else if(ch==3)
            {
                Console.Write("Enter A:");
                a = Convert.ToInt32(Console.ReadLine());
                Console.Write("Enter B:");
                b = Convert.ToInt32(Console.ReadLine());
                c = a * b;
                Console.WriteLine("Product = {0}", c);
            }
            else if(ch==4)
            {
                Console.Write("Enter A:");
                a = Convert.ToInt32(Console.ReadLine());
                Console.Write("Enter B:");
                b = Convert.ToInt32(Console.ReadLine());
                c = a / b;
                Console.WriteLine("Quotient = {0}", c);
            }
            else
            {
                Console.WriteLine("Invalid Choice");
            }
            Console.ReadKey();
        }
    }
}

Output

First run:

Calculator
----------------------------
1.Add
2.Substract
3.Multiply
4.Divide
Enter Choice(1-4):1
Enter A:10
Enter B:20
Sum = 30


Second run:

Calculator
----------------------------
1.Add
2.Substract
3.Multiply
4.Divide
Enter Choice(1-4):4
Enter A:10
Enter B:20
Quotient = 0


Third run:

Calculator
----------------------------
1.Add
2.Substract
3.Multiply
4.Divide
Enter Choice(1-4):5
Invalid Choice





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