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Practice Exercises Simple Programs, Functions, and Arrays

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1. Write a program that declares an array of five doublevalues and then sums the values.

Print the sum on screen.

2. Write a program that declares two arrays: one in which you will store 10 integers andanother one that you will use for storing the squared values of the 10 integers (so, if your

array is called numbersand numbers[0] stores the number 10, then the other array, that

might be called squares, will store 100 in squares[0]). Dont, however, hardcode the

squares, but calculate them using *, which is the multiplication operator.

3. For taking user input in C#, we are using the function

Console.ReadLine();

This function reads what the user enters (until Enteris pressed) and stores the input as a

string of characters. If we want to take an intor a doublevalue from the user, we have to

convert the input like in the following examples:

int.parse(Console.ReadLine());

double.parse(Console.ReadLine());

(Note: entering alphabetic or special characters instead of numbers will cause a failure in

the conversion; well see how to address that problem later in the course). Knowing this,

solve the last problem that you had on the quiz in C#: Imagine that we want to solve the

quadratic equation

for coefficients a, b, and centered by a user. Write a C# program solving the equation (first

ask the user to enter the coefficients, then calculate the result, and print the result on

screen).

For calculating square root in C#, use the Math.Sqrt() function which takes a parameter of

type double.

Hint: for calculating the result, use a function which takes the coefficients as parameters

and returns only one of the solutions of the equation.

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Practice Exercises Simple Programs, Functions, and Arrays

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4. In this problem, you will practice using multiple functions in a program. Write one

function called TakeInputthat asks a user to enter an integer and returns the integer. Then,

write another function called Calculatethat performs the following calculation

(a * a) + (a / a)

where a is the integer entered. Dont calculate (a * a) and (a / a) in one line of code, but use

one function for multiplication, called Multiply, and one for division, called Divide; hence,

Calculateshould call both Multiplyand Divide. Note that if ais 0, the program will fail, but

we are ignoring that in this example.