TEST in C,whats wrong here?

[neil_sof]

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n;
    scanf("%d",&n);
    while(1)
    {
        scanf("%d",&n);
        if(n==42)
            break;
        printf("%d",n);
    }
    return 0;
}

[lanaczko]

Remove first scanf()

[leppyr64]

For this input:

1
2
3
42

Your code prints:

2
3

For this input your code returns a NZEC.

42
1
2
3