• Review for Exam 1, (answers), Exam 1 (answers)
• Review for Exam 2, Exam 2 ( answers)

• Week 14 structs and fractions
  • structs, with Rational Numbers: structs and fractions
• Week 15: Input/Output and Review
  • Input/Output of Files: File I/O
  • Example with structs and file I/O: License Plate Example

You should also review your work for the programming assignments:

• Prog 9: Chutes and Ladders
• Prog 10: Infinite Series

1. Write a short if statement (no else) that will check if an int size is inside the range from 2 to 10 (inclusive) and will print "In range" if this is so.

2. Write another short if statement (no else) that will check if an int size is not inside the range from 2 to 10 (inclusive) and will print "Out of range" if this is so.

3. Suppose a variable temperature is supposed to be in the range from 96.0 to 100.6 inclusive. Write a short piece of C code (not an entire program or even a function) that will print the message "Temperature OK" in case the temperature is in range and will print "You are sick" in case the temperature is out of range.

   double temperature = 98.6; /* or = 104.2 or = 94.0 */
   /* put the rest of the code below */
   
   

4. Write a function that will take double x and double y as input formal parameters. Then the function should return the quadrand number that the point(x, y) lies in (1-4). In case the point is on an axis, return 0. Try this out with inputs: (1, 2), (-1, 3), (3, -2), (-1, -4), (0, 5), (-3, 0), (0, 0).

5. Translate the following while loop to a for loop that does the same thing:

   int i = 1;
   int sum = 0;
   while (i < 10) {
      sum = sum + i*i;
      i++;
   }
   printf("sum: %i", sum);
     

6. Translate the following for loop to a while loop that does the same thing:

   int k;
   for (k = 10; k >= 1; k--) {
      printf("%i", k);
      if (k != 10) printf(", ");
   }
   printf("\n");
     

7. Use a for loop to calculate 100000 terms of the following sum. Compare the result with pi*pi/6.0.

   1 + 1/22 + 1/32 + 1/42 + 1/52 + ...
     

8. Write a code segment that will use the following equations to approximate pi to 15 digits:

   a0 = 2*sqrt(3);  b0 = 3;
   
   a1 = 2*a0*b0/(a0 + b0); b1 = sqrt(a1*b0);
   

   Then replace a1 and b1 by a0 and b0, and repeat the last two equations. Keep repeating until a1 and b1 are within 1.0e-15 of one another. The final answer should be the average of a1 and b1.

9. Write a C function that will take two 1-dimensional int arrays and their size as formal parameters, and will compute and return their inner product. If int a[] = {1, 2, 3}; and int b[] = {6, 7, 8};, then the inner product (a*b) is 1*6 + 2*7 + 3*8. Execute your function with the above example and with another longer example.

10. Look at the initial input/output example in: Input/output.

11. You should especially look at the first example in: Structs and Fractions. Possible questions: I give you the definition of a struct, such as lines 2-6 in the example, and then ask you do declare several such structs (lines 12-14), how you can initialize them in two ways (line 12 and lines 15-17), how to reference fields in the structs (lines 15-17, and lines 27-29), how to pass a struct as an actual parameter (lines 20-22), and how do declare a struct as a formal parameter(line 8 and line 26).

12. In class we covered an example that used a struct and also input/output: License Plate Example.