#include <stdio.h>
#include <math.h>

/*
	g++ -O2           -DN=1973321288 trunc.cpp => diff = 1 <- why?
	g++ -O2 -DFIXED_A -DN=1973321288 trunc.cpp => diff = 0
	g++ -O2 -DFIXED_B -DN=1973321288 trunc.cpp => diff = 0
	g++ -O2           -DN=321782473  trunc.cpp => diff = 0
	g++ -O2 -DFIXED_A -DN=321782473  trunc.cpp => diff = 0
	g++ -O2 -DFIXED_B -DN=321782473  trunc.cpp => diff = 0
*/

int toInt32(double sample) {
	double tmp = sample * (sample > 0 ? 2147483647.0 : 2147483648.0);

#ifdef FIXED_A
	printf("%.30g\n", tmp);
#endif

#ifdef FIXED_B
	return (int)floor(tmp);
#else
	return (int)tmp;
#endif
}

double fromInt32(int sample) { 
	return (double)sample / (sample > 0 ? 2147483647.0 : 2147483648.0);
}

int main() {
	int r = N;
	
	double f = fromInt32(r); 
	int c = toInt32(f);
	
	printf("%d -> %.30g -> %d, diff %d\n", r, f, c, r - c);
}