Thread: sscanf problems

I have made a program to accept integers only however if i put a 25e in it it still works how do i fix it?

Code:

char line[MAXLINE];
int error, n;

do
{
    printf("Input a positive integer:   ");
    fgets(line, MAXLINE, stdin);
    error = sscanf(line, "%d", &n) != 1 || n <= 0;
    if(error)
        printf("\nERROR: Do it again. \n");
 }while (error);

i have to use sscanf and i am not familiar with this