Note: No late projects will be accepted.

The Objective

• To learn to use the gcc compiler
• To become familiar with syntax error messages generated by the gcc compiler

The Task

• For the first part of the assignment, you must complete the program attached to this sheet (to be distributed in class) by filling in the blanks where pieces of code are missing. After filling in the blanks, you are ready to move on to the second part of the assignment. For the second part, use Xemacs to type in the C program. Type it in EXACTLY AS SHOWN, including all spacing. (Two exceptions in the header comment: 1) insert YOUR name as the author and 2) insert YOUR e-mail address.) Make sure to save the program with the file name hw4.c.

• Compile the program using the command
  gcc -Wall hw4.c -o hw4.out

  Correct any compilation errors (if any) that you receive and recompile until you receive no errors. This is done properly by fixing the cause of the first error message and then recompiling. This may remove more than one error message. It is the case that one error early in the code can cause other error messages to print later even when there is nothing wrong (spurious errors). Working through the error messages beginning with the first message, and recompiling between fixing each of them, will insure that you are not trying to fix something that isn't really wrong.

• Look at your directory to make sure that the file hw4.out is there. This is your executable program.

• Run the program a few times using different sets of numbers to be sure that it works. To run your program, type hw4.out at the prompt (some of you might have to type ./hw4.out. You can assume the user will only input positive integers. Here is a sample run of the program: linux3[54]% ls hw4.c linux3[55]% gcc -Wall hw4.c -o hw4.out linux3[56]% ls hw4.c hw4.out linux3[57]% hw4.out Please enter an integer: 7 Please enter another integer: 9 9 is larger than 7. The average of 7 and 9 is 8.000000. linux3[58]% hw4.out Please enter an integer: 9 Please enter another integer: 7 9 is larger than 7. The average of 9 and 7 is 8.000000. linux3[59]% hw4.out Please enter an integer: 7 Please enter another integer: 7 7 and 7 are equal. The average of 7 and 7 is 7.000000. linux3[60]% hw4.out Please enter an integer: 5 Please enter another integer: 9 9 is larger than 5. The average of 5 and 9 is 7.000000. linux3[61]% hw4.out Please enter an integer: 5 Please enter another integer: 8 8 is larger than 5. The average of 5 and 8 is 6.500000. linux3[62]%

Submitting the Program

The Program