ConditionalStatements

Exercises from book "Fundamentals of Computer Programming with C#" Exercise 5: Conditional Statements

1. Write an if-statement that takes two integer variables and exchanges their values if the first one is greater than the second one.

2. Write a program that shows the sign (+ or -) of the product of three real numbers, without calculating it. Use a sequence of if operators.

3. Write a program that finds the biggest of three integers, using nested if statements.

4. Sort 3 real numbers in descending order. Use nested if statements.

5. Write a program that asks for a digit (0-9), and depending on the input, shows the digit as a word (in English). Use a switch statement.

6. Write a program that gets the coefficients a, b and c of a quadratic equation: ax2 + bx + c, calculates and prints its real roots (if they exist). Quadratic equations may have 0, 1 or 2 real roots.

7. Write a program that finds the greatest of given 5 numbers.

8. Write a program that, depending on the user’s choice, inputs int, double or string variable. If the variable is int or double, the program increases it by 1. If the variable is a string, the program appends "*" at the end. Print the result at the console. Use switch statement.

9. We are given 5 integer numbers. Write a program that finds those subsets whose sum is 0. Examples:

• If we are given the numbers {3, -2, 1, 1, 8}, the sum of -2, 1 and 1 is 0.
• If we are given the numbers {3, 1, -7, 35, 22}, there are no subsets with sum 0.

10. Write a program that applies bonus points to given scores 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 an error message.

11. * Write a program that converts a number in the range [0…999] to words, corresponding to the English pronunciation. Examples:

• 0 --> "Zero"
• 12 --> "Twelve"
• 98 --> "Ninety eight"
• 273 --> "Two hundred seventy three"
• 400 --> "Four hundred"
• 501 --> "Five hundred and one"
• 711 --> "Seven hundred and eleven"