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01. Is year leap
02. Random number generator
03. Day of the week
04. Surface of a triangle
05. Workdays
06. Sum of numbers in text
07. RPN - Tests
07. Reverse Polish Notation
05. Using Classes and Objects.sln
05. Using Classes and Objects.zip
Using-Classes-and-Objects.pptx

Using Classes and Objects

1. Write a program that reads a year from the console and checks whether it is a leap. Use `DateTime`.
• Write a program that generates and prints to the console 10 random values in the range [100, 200].

• Write a program that prints to the console which day of the week is today. Use `System.DateTime`.

• Write methods that calculate the surface of a triangle by given:

• Side and an altitude to it;
• Three sides;
• Two sides and an angle between them.
• Write a method that calculates the number of workdays between today and given date, passed as parameter. Consider that workdays are all days from Monday to Friday except a fixed list of public holidays specified preliminary as array.

• You are given a sequence of positive integer values written into a string, separated by spaces. Write a function that reads these values from given string and calculates their sum. Example: string = "43 68 9 23 318" -> result = 461

• * Write a program that calculates the value of given arithmetical expression. The expression can contain the following elements only:

• Real numbers, e.g. 5, 18.33, 3.14159, 12.6
• Arithmetic operators: +, -, *, / (standard priorities)
• Mathematical functions: ln(x), sqrt(x), pow(x,y)
• Brackets (for changing the default priorities)

Examples:

• (3+5.3) * 2.7 - ln(22) / pow(2.2, -1.7) -> ~ 10.6
• pow(2, 3.14) * (3 - (3 * sqrt(2) - 3.2) + 1.5*0.3) -> ~ 21.22

Hint: Use the classical "shunting yard" algorithm and "reverse Polish notation".

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