jsdz, 7 months ago (edited 7 months ago)

<span style="color:#323232;">int is_even(int n)
</span><span style="color:#323232;">{
</span><span style="color:#323232;">    int result = -1;
</span><span style="color:#323232;">    char number[8]; //should be enough
</span><span style="color:#323232;">    sprintf(number, "%d", n);
</span><span style="color:#323232;">
</span><span style="color:#323232;">    // check the number
</span><span style="color:#323232;">    // TODO: handle negative numbers
</span><span style="color:#323232;">    for (char *p=number; *p; p++)
</span><span style="color:#323232;">    {
</span><span style="color:#323232;">        if (*p=='0' || *p=='2' || *p=='4' || *p=='6' || *p=='8')
</span><span style="color:#323232;">            result = 1;
</span><span style="color:#323232;">        else if (*p=='1' || *p=='3' || *p=='5' || *p=='7' || *p=='9')
</span><span style="color:#323232;">            result = 0;
</span><span style="color:#323232;">        else {
</span><span style="color:#323232;">           fprintf(stderr, "Your number is wrong!n");
</span><span style="color:#323232;">           exit(1); 
</span><span style="color:#323232;">        }
</span><span style="color:#323232;">    }
</span><span style="color:#323232;">    return result;
</span><span style="color:#323232;">}
</span>