Briefly describe how the ! operator works.

This is a boolean variable that signals when some condition exists in the program.

a. flag

b. signal

c. sentinel

d. siren

Write an if statement that prints the message "The number is valid" if the variable temperature is within the range $-50$ through 150 .

The following statement should determine whether count is outside the range of $0$ through $100$ . What is wrong with it?

if (count < 0 && count > 100)

Write an if statement that displays “Goodbye” if the variable myCharacter contains the character 'D'.

Write a statement that uses the ternary operator to assign 2 to y if the variable x is greater than 0, else assigns 3 to y.

Write a program that asks the user to enter a number of seconds.

• There are $60$ seconds in a minute. If the number of seconds entered by the user is greater than or equal to $60$ , the program should display the number of minutes in that many seconds.

• There are $3,600$ seconds in an hour. If the number of seconds entered by the user is greater than or equal to $3,600$ , the program should display the number of hours in that many seconds.

• There are $86,400$ seconds in a day. If the number of seconds entered by the user is greater than or equal to $86,400$ , the program should display the number of days in that many seconds.

The process of comparing two strings character by character is known as ____________.

• a. lexicographical comparison
• b. logical comparison
• c. relational comparison
• d. case-sensitive string comparison

What risk does a programmer take when not placing a trailing else at the end of an if-else-if statement?

The following statement should determine whether count is within the range of $0$ through $100$ . What is wrong with it?

if (count >= 0 || count <= 100)

Write an if statement that assigns $0$ to the variable b and assigns 1 to the variable c if the variable a is less than $10$..

Triangle problem

Only if the sum of three angles is 180 degrees can we say that the formation of a triangle is possible. Write a program that asks the user to enter the values of three angles and calculates the sum of the angles. If the sum is 180 degrees, display a message indicating that triangle formation is possible, else display a message indicating that triangle formation is not possible.

Write nested if statements that perform the following tests: If amount1 is greater than 10 and amount2 is less than 100, display the greater of the two.

Explain the purpose of a flag variable. Of what data type should a flag variable be?