Hello World
using System;
class HeloWorld{
static void Main(string[args]){
Console.WriteLine("Hello, World!");
}
}
Swapping
using System;
class swapping
{
static void Main (string[]args)
{
int a = 5;
int b = 10;
Console.WriteLine($"Before swapping: a = {a}, b = {b}");
int temp = a;
a = b;
b = temp;
Console.WriteLine($"After swapping: a = {a}, b = {b}");
}
}
Fahrenheit
using System;
class Fahrenheit
{
static void Main (string[]args)
{
Console.Write("Enter temperature in Fahrenheit: ");
double fahrenheit = Convert.ToDouble(Console.ReadLine());
double celsius = (fahrenheit - 32) * 5 / 9;
Console.WriteLine($"Temperature in Celsius: {celsius:F2}");
}
}
Find the Area & Perimeter of a Rectangle
using System;
class rectangle
{
static void Main (string[]args)
{
Console.Write("Enter the length of the rectangle: ");
double length = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter the width of the rectangle: ");
double width = Convert.ToDouble(Console.ReadLine());
double area = length * width;
double perimeter = 2 * (length + width);
Console.WriteLine($"Area of the rectangle: {area}");
Console.WriteLine($"Perimeter of the rectangle: {perimeter}");
}
}
Simple Interest
using System;
class simpleInterest
{
static void Main (string[]args)
{
Console.Write("Enter the principal amount (P): ");
double principal = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter the rate of interest (R) in percentage: ");
double rate = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter the time period (T) in years: ");
double time = Convert.ToDouble(Console.ReadLine());
double simpleInterest = (principal * rate * time) / 100;
Console.WriteLine($"Simple Interest (SI) = {simpleInterest}");
}
}
Compound Interest
using System;
class compoundInterest
{
static void Main (string[]args)
{
Console.Write("Enter the principal amount (P): ");
double principal = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter the annual interest rate (R) in percentage: ");
double rate = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter the time period (T) in years: ");
double time = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter the number of times interest is compounded per year (n): ");
double n = Convert.ToDouble(Console.ReadLine());
double compoundInterest = principal * Math.Pow((1 + (rate / (n * 100))), (n * time)) - principal;
Console.WriteLine($"Compound Interest (CI) = {compoundInterest:F2}");
}
}
radiusCircle
using System;
class radiusCircle
{
static void Main (string[]args)
{
Console.Write("Enter the radius of the circle: ");
double radius = Convert.ToDouble(Console.ReadLine());
double area = Math.PI * Math.Pow(radius, 2);
Console.WriteLine($"Area of the circle: {area:F2}");
}
}
positive
using System;
class positive
{
static void Main (string[]args)
{
Console.Write("Please enter an integer: ");
Try to parse the input as an integer
if (int.TryParse(Console.ReadLine(), out int number))
{
Check if the number is positive
if (number > 0)
{
Console.WriteLine($"You entered a positive number: {number}");
}
else
{
Console.WriteLine("The number is not positive.");
}
}
else
{
Console.WriteLine("Invalid input. Please enter a valid integer.");
}
}
}
EvenOdd
using System;
class EvenOdd
{
static void Main (string[]args)
{
Console.WriteLine("Enter a number:");
int number = int.Parse(Console.ReadLine());
if (number % 2 == 0)
{
Console.WriteLine($"{number} is even.");
}
else
{
Console.WriteLine($"{number} is odd.");
}
}
}
Print Day Using Arrary
using System;
class dayUsingArrary
{
static void Main (string[]args)
{
Console.WriteLine("Enter a sequence of digits (0-6) representing days of the week (0=Sunday, 1=Monday, ..., 6=Saturday):");
string input = Console.ReadLine();
Array representing the days of the week
string[] daysOfWeek = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
Console.WriteLine("Days corresponding to your input:");
foreach (char c in input)
{
if (char.IsDigit(c))
{
int index = (int)(c - '0'); Convert char digit to integer
if (index >= 0 && index < daysOfWeek.Length)
{
Console.WriteLine(daysOfWeek[index]);
}
else
{
Console.WriteLine($"Invalid input: {c} is not a valid day index.");
}
}
else
{
Console.WriteLine($"Invalid character: {c} is not a digit.");
}
}
}
}
DayUsingElseif
using System;
class DayUsingElseif
{
static void Main (string[]args)
{
Console.WriteLine("Enter a number (0-6) to get the corresponding day of the week:");
string input = Console.ReadLine();
Validate input
if (input.Length == 1 && char.IsDigit(input[0]))
{
int dayIndex = int.Parse(input);
if (dayIndex >= 0 && dayIndex <= 6)
{
Print the corresponding day of the week
if (dayIndex == 0)
{
Console.WriteLine("Sunday");
}
else if (dayIndex == 1)
{
Console.WriteLine("Monday");
}
else if (dayIndex == 2)
{
Console.WriteLine("Tuesday");
}
else if (dayIndex == 3)
{
Console.WriteLine("Wednesday");
}
else if (dayIndex == 4)
{
Console.WriteLine("Thursday");
}
else if (dayIndex == 5)
{
Console.WriteLine("Friday");
}
else if (dayIndex == 6)
{
Console.WriteLine("Saturday");
}
}
else
{
Console.WriteLine("Please enter a number between 0 and 6.");
}
}
else
{
Console.WriteLine("Invalid input. Please enter a single digit (0-6).");
}
}
}
Discriminant
using System;
class discriminant
{
static void Main (string[]args)
{
Console.WriteLine("Enter coefficients a, b, and c (for ax^2 + bx + c = 0):");
Console.Write("a: ");
double a = Convert.ToDouble(Console.ReadLine());
Console.Write("b: ");
double b = Convert.ToDouble(Console.ReadLine());
Console.Write("c: ");
double c = Convert.ToDouble(Console.ReadLine());
Calculate the discriminant
double discriminant = b * b - 4 * a * c;
if (discriminant > 0)
{
Two real and distinct roots
double root1 = (-b + Math.Sqrt(discriminant)) / (2 * a);
double root2 = (-b - Math.Sqrt(discriminant)) / (2 * a);
Console.WriteLine($"Roots are real and distinct: x1 = {root1}, x2 = {root2}");
}
}
}
Greater among two number
using System;
class greater {
static void Main (string[]args)
{
Console.Write("a: ");
double a = Convert.ToDouble(Console.ReadLine());
Console.Write("b: ");
double b = Convert.ToDouble(Console.ReadLine());
if (a>b){
Console.WriteLine("a is greater");
} else{
Console.WriteLine("b is greater");
}
}
}
Vowel
using System;
class Vowel
{
static void Main (string[]args)
{
Console.WriteLine("Enter a string:");
string input = Console.ReadLine();
foreach (char c in input.ToLower())
{
if (char.IsLetter(c))
{
if ("aeiou".Contains(c))
{
Console.WriteLine($"'{c}' is a vowel.");
}
else
{
Console.WriteLine($"'{c}' is a consonant.");
}
}
else
{
Console.WriteLine($"'{c}' is not a letter.");
}
}
}
}
Eligibility
using System;
class Eligibility
{
static void Main(string[] args)
{
Console.Write("Enter Your age: ");
int age = Convert.ToInt32(Console.ReadLine());
Console.Write("Job Status:");
String jobstatus = Console.ReadLine().ToLower();
if (age >= 21 && jobstatus == "yes")
{
Console.WriteLine("Eligible for Marriage");
}
else if(age >= 21 && jobstatus == "no")
{
Console.WriteLine("Not Eligible for Marriage");
}
else{
Console.WriteLine("Please enter Yes or No Only ");
}
}
}
Rectangle to Square
using System;
class rectangletosquare
{
static void Main()
{
Console.WriteLine("Enter the length of the rectangle:");
double length = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("Enter the breadth of the rectangle:");
double breadth = Convert.ToDouble(Console.ReadLine());
if (length == breadth)
{
Console.WriteLine("The rectangle is a square.");
}
else
{
Console.WriteLine("The rectangle is not a square.");
}
}
}
