Thread: comparing integers

Code:

flag = 1;
while(flag == 1)
{
    printf("What is the student's Assignment 1 mark? :");
    scanf("%d",&a1);


    if((a1>100)&&(a1<0))
{
    printf("Invalid mark. Please enter again\n");
    flag = 1;
}
else
{
        flag = 0;
}
}

I'm trying see if the input integer is bigger than 100 and less than 0.
If it's so, then it prints invalid mark and it goes back to input section.
I made the above sample code to test this thing, but it's not working.
Could anyone help me with fixing this problem?

Oh my god.... Oh yeah!! You are absolutely right! I was being stupid haha.
Thank you very much for your help!