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