Objectives:
• Learn how to use structure array and file I/O
Description:
createArray function
• Use the implementation of file I/O operations, you’ve done in prelab to read the given file.
• The first number in the file is the number of students.
• Create an array of N Student structures, using malloc().
• Store an integer number of students at the beginning of the array.
• Close your file.
• Each Student structure should look like as follows:
typedef struct {
int id;
float GPA;
} Student;
After updating your createArray(), your array should look like this:
Number of Students
student[0]
student[1]
student[2]
…
student[N-1]
N
id: 0
id: 1
id: 2
…
id: N-1
GPA: 2.34
GPA: 2.99
GPA: 3.01
GPA: 2.98
getAverageOfGPA function
• Compute and display your average GPA for this given student array.
• Return average of all students’ GPA.
getNumOfStudents function
• Return the number of students that located in front of the array.
Main function steps:
• Call createArray function.
• Call averageOfGPA function.
• Display the result as Example below.
• Free the allocated array using your freeArray function.
Every user-defined function must have a comment describing:
• What function does;
• What parameter values are;
• What value it returns.
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Section A
Example from the terminal window:
• gcc main.c lab6.c -Wall -Werror
• ./a.out
The average of N students’ GPA is X.xx
Grading Criteria:
•
Main program:
6 points
•
createArray function:
12 points
•
getAverageOfGPA function:
6 points
•
getNumOfStudents function:
4 points
•
freeArray function:
2 points
Note:
• If your code does not compile with –Wall and –Werror, you will receive a zero for this assignment.
• You need to finish at least three peer reviews within three days of this lab. Otherwise, you will get a 20% penalty.
• You will lose points if you don’t have enough comments.
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