How can I print only the fractional part of the number

Question

Good evening, I would like to know how I can print the fractional part of the real number, that is, when I type 5.678, I would like to print in the second A(where this comment), only the number 0.678, what I should use for printing, I did not find in Math. there is one that solves the problem. Thank you.

#include <stdio.h>

int main (void)

{
    float A;
    scanf("%f", &A);

    A = ceil(A);
    A = ;//Impressão nesta linha da parte fracionaria
    A = floor(A);

    printf("%f\n%.0f\n%f", A, A, A);


return 0;   
}

Answer 1

A simple suggestion is to make a type casting from the number to an integer, and then subtract that integer value from the original number. For example:

printf("%f", A - ((int) A));

Thus, if the value of A for 5.678, the resulting operation will be:

5.678 - ((int) 5.678) = 5.678 - 5 = 0.678

Answer 2

You change the value of A in your code

    // digamos que o utilizador digitou 5.678
    A = ceil(A);                    // A passou a 6
    A = ;          // a parte fracionaria de 6 'e 0
    A = floor(A);                   // A passou a 6

I suggest you find other variables

    // digamos que o utilizador digitou 5.678
    B = ceil(A);                    // B passou a 6
    C = ;                           // ??
    D = floor(A);                   // D passou a 5