Learning Scanf

[rmxhaha]

So I am trying to enter a competition and they said that cin and cout in iostream are just too slow for that kind of stuff

    int testcase;
    scanf("%i", &testcase );

    int char_ke;
    char f, s;

    while( testcase-- ){
        cin >> f >> s >> char_ke;

        if( fibo_chara( char_ke ) ){
            printf("%c\n", f );
        } else {
            printf("%c\n", s );
        }
    }

This code just works but too slow
when I changed it to scanf like the one below

    int testcase;
    scanf("%i", &testcase );

    int char_ke;
    char f, s;

    while( testcase-- ){
        scanf("%c %c %i", &f, &s, &char_ke );

        if( fibo_chara( char_ke ) ){
            printf("%c\n", f );
        } else {
            printf("%c\n", s );
        }
    }

So is my syntax wrong
I don't think that's it
so can someone please point out what's the problem

[MiiNiPaa]

How the input looks like?
if it is something like ab123, you need to change your format string to "%c%c%i"

[zb0S216C]

rmxhaha wrote:

"so can someone please point out what's the problem"

You need to tell us what the problem is.

_Wazzak

[rmxhaha]

hmm, the input is smt like

2
a b 3000
c d 3000

and the output suppose to be

a
d

The program output correcly if I use cin as an input if scanf then the output is outrageous smt like
a 2147483647a

[TheIdeasMan]

scanf returns a value, so you should make use of this to see how well it worked. This can help avoid uninitialised data when the scanf doesn't work for some reason.

The same applies for output to a file - I tend to sprintf, see how well that went, then use fprintf to write the string to the file.

HTH

[Cubbi]

You forgot the space before the first %c. To make it similar to cin >> f >> s >> char_ke;, it's supposed to be
scanf(" %c %c %i", &f, &s, &char_ke )
Did you read the documentation on scanf? Make sure to understand exactly what each character, especially space, does in the format string.