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

You use the modf function:

double integral; double fractional = modf(some_double, &integral); 

You can also cast it to an integer, but be warned you may overflow the integer. The result is not predictable then.

Answer 2

Try this:

int main() {   double num = 23.345;   int intpart = (int)num;   double decpart = num - intpart;   printf("Num = %f, intpart = %d, decpart = %f\n", num, intpart, decpart); } 

For me, it produces:

Num = 23.345000, intpart = 23, decpart = 0.345000 

Which appears to be what you're asking for.