1. Chapter 3 Practice

2. Practice with if statement
Write an if statement that assigns 0 to x when y is equal to 20.
Write an if statement that multiply salary by 1.5 if hours is greater than 40.
Write an if statement that assigns to fine if boolean variable add_swap is true.
Write an if statement that assigns 0 to b and 1 to c if a is less than 10

3. Practice with if statement
Write an if statement that displays “Has dollar sign” if String variable s contains the character ‘$’.
Write an if-else statement that assigns 20 to y if x is greater than 100. Otherwise, it assigns 0 to y.
Write an if-else statement that assigns 1 to x when y is equal to 100. Otherwise, it assigns 0 to x.
Write an if-else statement that assigns 0.1 to commision unless sales is greater than or equal to 50000, in which case it assigns 0.2 to commission.
Write an if-else statement that assigns 0 to b and assigns 1 to c if a is less than 10. Otherwise, it assigns -99 to b and 0 to c.

4. Practice with boolean expression
One runner runs d1 meters in t1 seconds, another runner runs d2 meters in t2 seconds. Declare a boolean variable isFaster that has value true if the first runner runs faster than the second.
Given 3 integers a, b and c. Declare a boolean variable isTriangle that has value true if a, b, c can be the lengths of 3 sides of a triangle.
Given a circle with center at (0, 0) and radius r, and given a point (a, b). Declare a boolean variable isInside that has value true if the point (a, b) is inside the circle.
Given a circle with center at (0, 0) and radius r, and 3 integer coefficients a, b, c of equation of a line ax + by + c = 0. Declare a boolean variable isTangent that has value true if the line ax + by + c = 0 touches the circle at exactly one point.

5. Practice with switch statement
Write a switch statement for variable ch of type char, based on its value as below:
ch=‘A’: diplays “Excellent”
ch=‘B’: diplays “Very Good”
ch=‘C’: diplays “Good”
ch=‘D’: diplays “Fair”
ch=‘F’: diplays “Fail”
Otherwise: displays “Not a grade”

6. Standard 52-card Deck Heart Queen DiamondKing Heart Club DiamondJack
Spade
Heart Ace

7. Practice with switch statement
A deck has 52 cards, numbered from 0 to 51 using the following way:
Heart: Ace  King, numbered from 0 to 12.
Diamond: Ace  King, numbered from 13 to 25.
Club: Ace  King, numbered from 26 to 38.
Spade: Ace  King, numbered from 39 to 51.
Write a program that reads a number from 0 to 51,
then displays the name of card.
Example:
11  Heart Ten, 45  Spade Five, 38  Club Jack