Thread: C Programming help needed

I'm stumped on this assignment. C hasn't really been coming easy for me so I would appreciate some help!

Problem 1: Is It Prime?

Write a C program that takes a positive integer on the standard input (aka, user input) and prints ”prime” or ”composite” or ”unit” (A number is a unit if it is 1, prime if it is divisible only by 1 and itself (and is not 1), and composite otherwise). I recommend using the % modulus operator, as it returns the remainder of dividing two numbers. n % x == 0 only if x evenly divides n. Using loops, particular a for loop, would be quite advantageous. Example input and output:
Enter a number: 6 composite

Problem 2: Guess My Number

You are going to generate a random number between 1 and 10. Remember to include time.h. At the beginning of the main function, use the following:
//This seeds the random generator using the current time . srand (time(NULL));
Then you can get a random number between 1 and 10 using:
int r = rand () % 10 + 1;
Let the user keep guessing until they get it correct. Then output how many guesses it took. OPTIONAL: Tell them whether they are too high or too low.
I am thinking of a number between 1 and 10.
Your guess : 5 Incorrect . Guess again : 7 Incorrect . Guess again : 2 Correct ! Number of guesses : 3.

thank you very much for your help

The chances of your post being welcome here would probably be greater if you wrote here what you've tried so far. Then, we can point suggestions on the code you've written.

I'm sorry, I honestly do not know C. I am trying to learn some languages so I can go back to school. I know HTML and python, C is just coming on difficult to me. I like to learn it by looking at code and breaking it down.

Originally Posted by jluzi

...C is just coming on difficult to me. I like to learn it by looking at code and breaking it down.

There's your problem. You won't learn C by simply studying code. As stdq said, you should get yourself a good book. Open it to the first chapter and start learning from the beginning. Read about how C works, type out the examples for yourself, modify the examples to see if the changes do as you expect, and do all practice problems at the end of the chapter. Do a few simple "test" programs along the way to see how well you understand the concepts you've learned.

If you already have some experience with programming languages, then learning C should come easier than if it were your first language ever.

Honestly, I don't know how much you can learn by "breaking down" the code, if you don't know the basic rules of the language in the first place.