Compute this in C

Write a Perl program that asks the values of the length and width of a rectangle and prints the area of the rectangle. (10 points. File name:hw3_1) Write a Perl program that asks a number and prints the sum from 1 to the entered number. (10 points. File name:hw3_2) Ex) 1. 2. $ Enter a number: 10 $ The sum from 1 to 10 is 55 3. Write a Perl program that asks a series of words (with one word per line) until end-of-input then prints the series of words in an inverse order. (15 points. File name:hw33) Ex) S Enter a series of words: Hello Apple World Good $ The result is: Good World Apple Hello Write a Perl program that asks a series of words (with one word per line) until end-of-input, prints the above words in ASCII order, and then prints the repeated words. (15 points. File name hw3 4) 4. Ex) 5 Enter a series of words: Fred Barney Wilma Betty Fred $ The result is Barney Betty Fred Wilma $ The repeated words Fred