Exercise 7 - due at 11:59:00 PM EST on Sunday, 02/27/2022 through Canvas

You may solve all the problems in the same program.

1. Read in the size of an ASCII art character from the user. You may assume this would always be a positive odd number >=7. You do not have to test for it. 
Then, print the ASCII art for the numeral charcater 3, of the given size.

Sample Run:
Enter the size: 9

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        *
        *
        *
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        *
        *
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2. Write a C++ function to calculate the area of a rectangle. The function will accept 2 double parameters and return a double. In the main function, read in the values for height and width from the user, and call the function to calculate the area.

Sample Run: 

Enter the height: 2.5
Enter the width: 3.8

The area is 9.5

3. Add a global variable pi to the program. Intitialize it with 3.1415. Write a void function called printArea that takes in the radius of the circle as a parameter and uses the global pi to calculate and print the area.

In the main function, create a local variable called pi. Read in pi and the radius of the circle from the user. Calculate the area with the new values and print it. Also, call the printArea function.

Sample Output:

Enter the radius: 15.5

Enter the value of pi: 3.14

The area calculated in main: 754.385

The area calculated in printArea: 754.7454