Write a C program that lets a user calculate his or her Body Mass Index.  Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult men and women.  BMI is calculated using your height (in feet and inches) and weight (in pounds). The formula for BMI is

BMI = (weight in pounds * 703) / (height in inches) ^ 2

The result of the formula is then plugged into a table to determine a person's status:

BMI	Category
greater than 29.9	Obese
25.0 - 29.9	Overweight
18.5 - 24.9	Normal
less than 18.5	Underweight

Your program will prompt the user for his or her height (get feet and inches) and weight, then output the appropriate BMI (to 1 decimal place) and the category. Use floating point precision.

Write a C program that outputs "Hello World!"

Write a C program that calculates interest for 1 year. Prompt the user for a dollar amount and an interest rate, then output the interest earned and the new principal. Format both these numbers to two decimal places.

Write a program that accepts a file name from the command line and outputs the file contents to the screen. Also output the number of alphanumeric characters. Your program need only work with text files. If the user didn't supply the correct number of command line arguments, output the usage information and exit. If the file doesn't exist, output an error message.