csharp-console-examples (1-10)

using System;

namespace CSharpExamples
{
    class Program
    {
        static void Main(string[] args)
        {
            //Example 1: C# Program to Print Hello World
            Console.WriteLine("Hello World");


            //Example 2: C# Program to Print an Integer Entered by User
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine("You entered : {0}", n);
            //or
            int num = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("You entered : {0}", num);


            //Example 3: C# Program to Add Two Integers
            int num1, num2, sum;
            Console.Write("Input number1: ");
            num1 = int.Parse(Console.ReadLine());
            Console.Write("Input number2:");
            num2 = int.Parse(Console.ReadLine());
            sum = num1 + num2;
            Console.WriteLine("The sum is = " + sum);


            //Example 4: C# Program to Multiply two Floating Point Numbers Entered by User
            float num1, num2, multy;
            Console.Write("Input number1: ");
            num1 = int.Parse(Console.ReadLine());
            Console.Write("Input number2:");
            num2 = int.Parse(Console.ReadLine());
            multy = num1 * num2;
            Console.WriteLine($"{num1} * {num2} = {multy} ");


            //Example 5: Multiply Two Floating Point Numbers in C# Console
            float number1, number2, product;
            number1 = 12.45f;
            number2 = 10.74f;
            product = number1 * number2;
            Console.WriteLine($"{number1} * {number2} = {product} ");


            //Example 6:  C# Program to Compute Quotient and Remainder
            int dividend = 50, divisor = 8;
            int quotient = dividend / divisor;
            int remainder = dividend % divisor;
            Console.WriteLine("Dividend: {0} Divisor: {1}", dividend, divisor);
            Console.WriteLine("Quotient = " + quotient);
            Console.WriteLine("Remainder = " + remainder);


            //Example 7: Program To Calculate the Simple Interest in C#
            int P, T;
            float R, SI;
            Console.Write("Enter Amount :");
            P = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter Rate :");
            R = Convert.ToSingle(Console.ReadLine());
            Console.Write("Enter Time :");
            T = Convert.ToInt32(Console.ReadLine());
            SI = P * R * T / 100;
            Console.WriteLine("Interest is :{0}", SI);


            //Example 8: C# Calculate Rectangle Area
            int area, length, width;
            Console.Write("Please write the length of your rectangle: ");
            length = int.Parse(Console.ReadLine());
            Console.Write("Please write the width of your rectangle: ");
            width = int.Parse(Console.ReadLine());
            area = length * width;
            Console.WriteLine("The area of rectangle : {0}", area);


            //Example 9: C# Square Area and Perimeter Calculator
            int squareheight, area, perimeter;
            Console.Write("Please write the height of your square: ");
            squareheight = int.Parse(Console.ReadLine());
            area = squareheight * squareheight;
            perimeter = 4 * squareheight;
            Console.WriteLine("Area : {0}\nPerimeter : {1}", area, perimeter);


            //Example 10: Area and Perimeter of Circle in C# Console Application
            double r, area, perimeter;
            Console.Write("Please write the radius of your circle: ");
            r = int.Parse(Console.ReadLine());
            area = 3.14 * Math.Pow(r, 2);
            perimeter = 2 * 3.14 * r;
            Console.WriteLine("The perimeter of your circle : {0}", perimeter);
            Console.WriteLine("The area of your circle : {0}", area);
        }
    }
}