C阵列程序因分段错误而崩溃

Question

I am learning array and just wrote this small program to see how it works. but its crashing with segmentation faul which i understand mean i am writing my variable / function to an memory place not allotted to it. But I cant figure how. Can anyone let me know please? i am calling introArray from my main().

int introArray (void)
{
    int total, ctr;

    printf("enter how many students \n");
    scanf("%d", &total);

    int students[total];
    ctr = 0;

    while ( students[ctr] <= total)
    {
        printf("enter student %d DOB in mmddyy \n", ctr );
        scanf("%d", students[ctr]);
        ctr++;
    }

    return 0;

}

Answer 1

In your code, there is one implementation logic issue. The total number of students is total and hence, your while loop should be

while(ctr < total)

The data to be read also should scanf("%d", &students[ctr]); There is an ampersand missing

Answer 2

ctr goes beyond total . This way you are going out of bound Change the loop to

while (ctr < total)
{
        printf("enter student %d DOB in mmddyy \n", ctr );
        scanf("%d", &(students[ctr]));
        ctr++;
}

Answer 3

This line

while ( students[ctr] <= total)

is not protection against reading past your array bounds inside the loop. This will stop you reading past the end of your array provided you use ctr as your index

while ( ctr < total)

you need the strict inequality as array indices are zero based.

In addition, your scanf call inside your while loop is wrong - the second argument should be a pointer and currently you pass an integer. It should be

scanf("%d", &students[ctr]);

Answer 4

I think

scanf("%d", students[ctr]);

should be

scanf("%d", &students[ctr]);