Help with while loop

[Hater]

#include <stdio.h>
#include <stdlib.h>
#define N 5


int main()
{
    int counter = 0, num = 0;
    int memory[N];
    while(scanf("%d", &num) != EOF){
        if (counter == N){
            for(int i = 0; i< N-1; i++){
            memory[i] = memory[i+1];
        }
        memory[N-1] = num;
        continue;
        }
        memory[counter] = num;
        counter++;


    }
        for(int i = 0;i < counter; i++){
            printf("%d ", memory[i]);
        }


    return 0;
}

My while loop wouldn't terminate when I enter -1 as value, it just keeps registering more and more numbers into the array even the -1 and never reaches the second part of the code(the printf).

the only solution I could think of is adding another if statement but I feel like it's supposed to be working without it.

#include <stdio.h>
#include <stdlib.h>
#define N 5


int main()
{
    int counter = 0, num = 0;
    int memory[N];
    while(scanf("%d", &num) != EOF){
        if(num == EOF){
            break;
        }
        if (counter == N){
            for(int i = 0; i< N-1; i++){
            memory[i] = memory[i+1];
        }
        memory[N-1] = num;
        continue;
        }
        memory[counter] = num;
        counter++;


    }
        for(int i = 0;i < counter; i++){
            printf("%d ", memory[i]);
        }


    return 0;
}

If it's not supposed to be working without the second if statement may I recieve a small explanation to why it is like this?

Thanks alot in advance!

[laserlight]

In your original code, I would change this:

while(scanf("%d", &num) != EOF)

to this:

while(scanf("%d", &num) == 1 && num != -1)

That is, you keep looping as long as you read and assign 1 value in the scanf, i.e., to num, and num is not equal to -1. Previously, your loop didn't terminate when you entered -1 because you didn't check for it.

In your revised code, you did check for it, but by incorrectly comparing it to EOF. EOF could be -1, but that isn't guaranteed.

[Hater]

After reading your comment I came to a conclusion that my assumption about EOF was wrong so I went to re-read information about EOF and noticed that I need to enter ctrl+z instead of -1.
With that my initial code is working as expected!

Thanks alot!