Homework Assignments – Spring 2010

C Programming (COP-2220)

Assignments, due dates, and hints are given below, most recent first. Homework is due by midnight of the date shown. Send your homework as an email attachment from your FSCJ email account to sdifranc@fscj.edu. Include your name, homework number, and the class and reference number in the subject line as described in the homework guidelines.

Note: If you are asking for help on an assignment rather than turning it in, make sure to include the word "Help" in the subject line.

Hw06: Equivalent Resistance (due 3/3)

The formula for the total resistance r_t of a circuit with n parallel resistors is:

Write a program to allow the user to input an arbitrary number of floating point resistances r₁, r₂ , ... in ohms, terminating when the user 0 (or EOF, or any invalid input), then display the equivalent resistance in ohms, rounded to three decimal places. Here is an example: presist2.exe

Hw05: Quadratic Formula (due 2/24)

From algebra, you remember that the general solution (the roots) to the quadratic equation of the form

can be obtained as:

Write a program that prompts the user for three floating point values representing the coefficients a, b, and c of a quadratic equation, inputs them (using scanf), then calculates and displays the roots of the equation. Here is an example, compiled program:  quad.exe Note that you should verify that a is not equal to 0. Also, there may be no roots, one root, or two roots, depending on whether the discriminant (b² – 4ac) is negative, zero, or positive, respectively. You will need to use the sqrt function from the math.h header file.

For an extra challenge, write the program so that the user can enter a succession of coefficients, terminating input by enter EOF (Ctrl + Z), as in this program: quad_2.exe.

This is a team assignment. Please read the guidelines for team assignments. Here are the teams:

• Tony A. (allet8) & Jared C. (campjr6)
• Howard C. (carahw) & Brooks C. (comeb)
• Bryan E. (ellibs1) & Kenny F. (feieka1)
• Corey F. (fishcs2) & Hector F. (florhl)
• Chris F. (fulgc) & Daniel G. (grahd)
• Megan H. (hailmj) & Mansel K. (karam2)
• Alex M. (moyeam) & Daniel O. (orlada)
• Owen P. (philok) & Lovander P. (powel9)
• Zach P. (privza) & Pratyusha S. (somapv1)
• Edward S. (swine) & Titngai T. (tamt)
• Teddy T. (turntt) & Jason V. (voorjb)
• Madalene V. (voormn) & Joseph W. (wisnjj1) & Derek Y. (youndd3)

Submit your assignment as hw05-xxx.c, where xxx are the initials of the team member turning it in. Don't forget to cc the other team member(s).

Hw04: More Complicated Computations (due 2/17)

Write a program to validate a 16-digit credit/ATM number using the Codabar system, which catches most numbers containing incorrect or adjacent transposed digits:

For example, consider the number 6040 9560 0083 1083. The sum of the odd digits is 6+4+9+6+0+8+1+8 = 42, the sum of the even digits is 0+0+5+0+0+3+0+3 = 11, and the number of odd digits >= 5 is 5 (6, 9, 6, 8, 8). And (2 * 42) + 11 + 5 = 100, a number ending in 0, so the card number is valid (at least in format).

Here is a sample executable you can use to see the interface and to check your program. Note that the program will accept spaces or other characters to separate digits or groups of digits, but also verifies that 16 digits (0-9) have been entered: ccval.exe

Hw03: Basic Computations (due 2/3)

One of the consequences of the Special Theory of Relativity is that a moving clock slows down with respect to a stationary one. At normal velocities this effect is negligible, but at velocities approaching the speed of light (usually written as c, which is 300,000 km/sec), the effect is quite pronounced. This formula shows the time in hours elapsed on a stationary clock (t) for one hour on a clock moving at velocity v:

Write a program that displays a table of this "time dilation" effect for velocities 0.1c -0.9c, in increments of 0.1, as in this sample executable: timedil.exe

Note you will need to use the math.h standard library for the sqrt function.

 Save your source code with the filename hw03-xxx, where xxx are your initials.

Hw02: Data Representation (due 1/27)

Answer the "Self-test Questions" at the end of the lecture notes on "Data Representation". Type your answers with a text editor (like Notepad, but not a word processor, like WordPad or MS Word), and save it as an ASCII text file with the name hw02-xxx.txt, where xxx are your initials.

Hw01: Using The Dev-C++ IDE (due 1/20)

Modify the program given in the Dev-C++ Tutorial to prompt the user for a number of students who have signed up for the senior class trip to Washington, D.C., then calculate the number of full buses (each can hold 42 students) needed, and the number of students that will be on the last partially-filled bus (i.e., the number of students "left over"), if any, and display the result.

As an extra challenge (not extra credit), solve this problem instead: prompt the user to enter a number of seconds, and convert this to hours, minutes, and seconds, as in this program. (This is an executable, machine language program.)

Save your source code with the filename Hw01-xxx, where xxx are your initials, and email to me as an attachment from your student email account as described in the homework guidelines.