Issue
I looked at this and this and this and this and more.
Question is:
A basic C Programming MOOC on EdX is showing how to access a member of a struct within a function, when the struct was passed by pointer. Why in the world are they using &
next to *
???
They show: scanf("%lf", &(*studptr).aveGrade);
Why not just use studptr.aveGrade
in scanf?
(Leaving aside the separate question, "why use scanf at all")
(Was asked for complete example)
void readStudent(struct student *studptr) {
print("\nEnter a new student record: \n");
printf("First name: ");
scanf("%s", (*studptr).firstName);
printf("Last name: ");
scanf("%s", (*studptr).lastName);
printf("Birth year: ");
scanf("%d", &(*studptr).birthYear);
printf("Average grade: ");
scanf("%lf", &(*studptr).aveGrade);
}
Solution
Because &
doesn't refer to (*stupdtr)
, it refers to (*studptr).aveGrade
. The .
operator has higher precedence.
Answered By - Federico klez Culloca Answer Checked By - Robin (PHPFixing Admin)
0 Comments:
Post a Comment
Note: Only a member of this blog may post a comment.