Review Questions

I l @ ve RuBoard

Review Questions

1. What is the difference between an actual argument and a formal argument?

2. Write ANSI C function headings for the following functions described. Note we are asking just for the headings, not the body.

   1. donut() takes an int argument and prints that number of 0s .

   2. gear() takes two int arguments and returns type int .

   3. stuff_it() takes a double and the address of a double variable and stores the first value in the given location.

3. Write ANSI C function headings for the following functions described. Note that you need write only the headings, not the body.

   1. n_to_char() takes an int argument and returns a char .

   2. digits() takes a double argument and an int argument and returns an int .

   3. random() takes no argument and returns an int .

4. Devise a function that returns the sum of two integers.

5. What changes, if any, would you need to make to have the function of Question 4 add two double numbers instead?

6. Devise a function alter() that takes two int variables x and y and changes their values to their sum and their difference, respectively.

7. Is anything wrong with this function definition?

    void salami(num) {    int num, count;    for (count = 1; count <= num; num++)        printf(" O salami mio!\n"); } 

8. Write a function that returns the largest of three integer arguments.

9. Given the following output:

    Please choose one of the following: 1) copy files            2) move files 3) remove files          4) quit Enter the number of your choice: 

   1. Write a function that displays a menu of four numbered choices and asks you to choose one. (The output should look like the preceding .)

   2. Write a function that has two int arguments: a lower limit and an upper limit. The function should read an integer from input. If the integer is outside the limits, the function should print a menu again (using the function from part a. of this question) to reprompt the user , and get a new value. When an integer in the proper limits is entered, the function should return that value to the calling function.

   3. Write a minimal program using the functions from parts a. and b. of this question. By minimal, we mean it need not actually perform the actions promised by the menu; it should just show the choices and get a valid response.

I l @ ve RuBoard