How to extract the decimal part from a floating point number in C?

Question

How can we extract the decimal part of a floating point number and store the decimal part and the integer part into two separate integer variables?

Answer 1

The quick "in a nut shell" most obvious answer seems like:

#define N_DECIMAL_POINTS_PRECISION (1000) // n = 3. Three decimal points.

float f = 123.456;
int integerPart = (int)f;
int decimalPart = ((int)(f*N_DECIMAL_POINTS_PRECISION)%N_DECIMAL_POINTS_PRECISION);

You would change how many decimal points you want by changing the N_DECIMAL_POINTS_PRECISION to suit your needs.