How to use fread an fwrite in SPOJ?

[spalac24]

I've been looking through some problems where even scanf() wont work fast enough, so i wonder if anyone could help me giving a simple example of fread and fwrite functions, i've been searching but i don't manage to understand how to use those functions here in SPOJ.

Thanks a lot!

[leppyr64]

What problems are those? If you cant pass within the timelimit I would suspect your algorithm, not I/O.

Using fread involves writing your own input methods. Fread just reads an amount of bytes from an input stream. What you do with it after that is all up to you.

[spalac24]

Read it into what? the char* ? So how can i get what i read from there? i'm sorry, but i'm not an ace on C++, i would like to learn, for example, if i use this, is it valid? :

struct scanner {
    scanner(){};
    int INT;
    int nextInt(){
        fread(&INT,sizeof(int),1,stdin);
        return INT;
    }   
};
int main () {
   scanner sc;
   int a = sc.nextInt();
   printf("%d\n",a);
}

why doesn't int work? as far as i understand, fread locates the number of bytes (sizeof(int)) in INT (its only one element) from stdin, what i am doing wrong? thanks.

[leppyr64]

All fread does is write the characters from the stream to the address in the pointer, it doesn't understand that the values are in base 10 and do the multiplication.

Also, if the buffer is "1 AB" and you try to fread sizeof int, you'll read the whole thing.

Read into a char array and parse from there.

[spalac24]

Ok, thank you, now i should look for the way of parsing that, wich does not seem too easy. Again thanks.