Question

2. The population of New York City in 2010 was 8,175,133 people. Assuming that the population doubled every 40 years, create a Java program to calculate in which year the population of NYC was about 10,000 people. (Use printf to format output.)

Answer 1

Here's a Java program that calculates in which year the population of NYC was about 10,000 people:

```
public class PopulationCalculator {
public static void main(String[] args) {
int population = 8175133; // Population of NYC in 2010
int year = 2010;

while (population >= 10000) {
population /= 2; // Divide population by 2 every 40 years
year += 40; // Add 40 years to the current year
}

System.out.printf("The population of NYC was about 10,000 people in the year %d.", year);
}
}
```

In this program, we start with the population of NYC in 2010 and the current year (2010). Then we use a `while` loop to divide the population by 2 every 40 years and add 40 years to the current year until the population is less than 10,000 people.

Once the loop ends, we use `printf` to output the year when the population was about 10,000 people. The `%d` format specifier is used to insert the year value into the output string.

Note: This program assumes that the population doubles exactly every 40 years, which may not be entirely accurate.