IvanNikolov

using System;

class CalculateGCD
{
    static void Main(string[] args)
    {
        // function gcd(a, b)
        // while b ≠ 0
        //   t := b
        //   b := a mod b

IvanNikolov

using System;
using System.Collections.Generic;
//Write a program that reads from the console a sequence of 
//n integer numbers and returns the minimal, the maximal number, 
//the sum and the average of all numbers (displayed with 2 digits after the decimal point). 
//The input starts by the number n (alone in a line) followed by n lines, 
//each holding an integer number. The output is like in the examples below.
//Examples:
//input	    output		
// 3        min = 1

IvanNikolov

using System;
//Write a program that finds the biggest of five numbers
//by using only five if statements. 
class BiggestOf5Numbers
{
    static void Main()
    {
        double a = double.Parse(Console.ReadLine());
        double b = double.Parse(Console.ReadLine());
        double c = double.Parse(Console.ReadLine()); 

IvanNikolov

using System;
//Write a program that shows the sign (+, - or 0) 
//of the product of three real numbers,
//without calculating it. Use a sequence of if operators. Examples:
//a 	b	    c	    result
//5	    2	    2	    +
//-2    -2	    1	    +
//-2	4	    3	    -
//0	    -2.5	4	    0

IvanNikolov

using System;
//Classical play cards use the following signs to designate the card face:
//2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K and A. 
//Write a program that enters a string and prints “yes” 
//if it is a valid card sign or “no” otherwise. Examples:
//character	 Valid card sign?
//  5	        yes
//  1         	no
//  Q	        yes
//  q         	no

IvanNikolov

using System;
//Write a program that applies bonus score to given score in the range
//[1…9] by the following rules:
//•	If the score is between 1 and 3, the program multiplies it by 10.
//•	If the score is between 4 and 6, the program multiplies it by 100.
//•	If the score is between 7 and 9, the program multiplies it by 1000.
//•	If the score is 0 or more than 9, the program prints “invalid score”.
//Examples:
//score	result
//2	20

IvanNikolov

using System;

//Write an if-statement that takes two doubleeger variables a and b
//and exchanges their values if the first one is greater than the second one. As a result prdouble the values a and b, separated by a space. Examples:
//	b	result
//5	2	2 5
//3	4	3 4
//5.5	4.5	4.5 5.5
class ExchangeIfGreater
{

IvanNikolov

using System;
//Write a program that enters 3 real numbers and prints them
//sorted in descending order. Use nested if statements.
//Don’t use arrays and the built-in sorting functionality.
//Examples:
//a	    b	    c	    result
//5	    1	    2	    5 2 1
//-2	-2	    1	    1 -2 -2
//-2	4	    3	    4 3 -2

IvanNikolov

using System;
//Write a program that finds the biggest of three numbers.
//Examples:
//a	    b	    c	biggest
//5	    2	    2	    5
//-2	-2      1	    1
//-2	4	    3	    4

class BigestOf3Numbers
{

IvanNikolov

using System;

//Write a C# program to print on screen the result of adding, subtracting, 
//multiplying and dividing two numbers typed by the user. 
//The remainder of the division must be displayed, too. 
//It might look like this: 
//Enter a number: 12 
//Enter another number: 3 
//12 + 3 = 15 
//12 - 3 = 9