I need a function that reads grades (integers) from from file and returns a dynamically allocated array in which they are stored.
This is what I have tried:
int *readGrades() {
int *grades;
int x;
scanf("%d", &x);
grades = malloc(x * sizeof(int));
return 0;
}
However I don't get anything when I run the code. The grades are stored in file called 1.in
:
29
6 3 8 6 7 4 8 9 2 10 4 9 5 7 4 8 6 7 2 10 4 1 8 3 6 3 6 9 4
and I run my program using: ./a.out < 1.in
Can anyone tell me what I did wrong?
Hopefully, you are looking for the following program. This reads your grades.txt, creates the memory and finally frees up. I have tested the following program, and it works fine.
Problem: The following code:
reads 1
int
from the standard input, THEN it allocates an array ofint
s and itreturn
s0
which zero-initializes caller's pointer when used like this:Solution: Apart from reading the count of grades, the function should read the grades as well. The array should be initialized BEFORE the reading and the actual reading of grades should be done in a loop, which would initialize array's elements. At the end, a pointer to the first element should be returned: