1. Imagine a program that reads the population of a city using the following statements: System.out.print("Enter the population of the city: "); int population = keyboard.nextInt( ); Write a while...

1. Imagine a program that reads the population of a city using the following

statements:

System.out.print("Enter the population of the city: ");

int population = keyboard.nextInt( );

Write a while loop after these statements that ensures that population is

positive. I f the user enters a population that is either negative or zero, ask

the user to enter a nonnegative value.

2. What output is produced by the following code?

for (int n = 1; n <=>

System.out.println(n);

3. What output is produced by the following code?

int n;

for (n = 1; n > 4; n++)

System.out.println(n);

4. What output is produced by the following code?

for (int n = 4; n > 0; n––)

System.out.println(n);