The Pennsylvania Turnpike charges tolls based on vehicle class. Classes are defined as:

- Class 1: less than 7000 lbs;

- Class 2: 7001 - 15,000 lbs;

- Class 3: 15,001 - 19,000 lbs;

- Class 4: 19,001 - 30,000 lbs;

- Class 5: more than 30,000 lbs.

Write a .cpp program that asks the user for a vehicles weight and figure out the vehicles class. Then use a switch statement to calculate the toll: $4 for class 1, $6 for class 2, $10 for class 3, $20 for class 4, $40 for class 5.