using System; using static System.Console; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace AMPCh02Ex04 { class Program { static void Main(string[] args) { int quarters, dimes, nickels, pennies, change = 15974; WriteLine("Change = " + $"{(double)change / 100:C}"); quarters = change / 25; change %= 25; dimes = change / 10; change %= 10; nickels = change / 5; change %= 5; pennies = change; WriteLine("Quarters = " + quarters); WriteLine("Dimes = " + dimes); WriteLine("Nickels = " + nickels); WriteLine("Pennies = " + pennies); ReadKey(); } } }

This C console application is a simple program to calculate the breakdown of an amount of change into quarters, dimes, nickels, and pennies. The amount of change given in the program is 15974 cents, or $159.74. Here's what happens step by step:

1. The program declares and initializes variables for storing the number of quarters, dimes, nickels, and pennies it will calculate, as well as the total change in cents which is given the value of 15974.

2. It converts this total change into dollars and cents and prints it in a currency format ("$159.74") using string interpolation and the currency ("C") format specifier.

3. The program calculates the number of quarters by dividing the total change by 25 (since a quarter is worth 25 cents).

4. It then uses the modulus operator to update the change variable to the remainder of change after the quarters have been accounted for.

5. Next, it calculates the number of dimes by dividing the remaining change by 10.

6. Again, it uses the modulus operator to update the change variable to the remainder of change after the dimes have been accounted for.

7. The process is repeated for nickels, dividing by 5 and then updating the change variable.

8. The remaining change after accounting for quarters, dimes, and nickels is the number of pennies.

9. Finally, the program prints the number of quarters, dimes, nickels, and pennies.

10. The last line of the `Main` method keeps the console window open, waiting for a key press before the program exits.