CONVERSION FLOAT -> INT

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>


//******************************************************************
//******************************************************************
int ftoi(float f)
{
	DWORD dw = *((DWORD*) &f);
	if(dw == 0)
		return 0;

	char exp = (char) (((dw>>23)&0xFF)-127);
	if(exp < 0 || exp > 23)
		return 0;
	
	int val = (1<<exp) + ((dw&0x7FFFFF)>>(23-exp));
	if(dw&0x80000000)
		return -val;
	else
		return val;
}


#define NB_BCL	100000000

float floatVal;
int intVal;

//******************************************************************
//******************************************************************
int main()
{
	srand(GetTickCount()^GetCurrentProcessId());


	DWORD dwDeb1 = GetTickCount();
	for(int i = 0; i < NB_BCL; i++)
	{
		int val = rand();
		floatVal = val/3.14159f;
		intVal = (int) (float)floatVal;
	}
	DWORD dwFin1 = GetTickCount();

	DWORD dwDeb2 = GetTickCount();
	for(int j = 0; j < NB_BCL; j++)
	{
		int val = rand();
		floatVal = val/3.14159f;
		intVal = ftoi(floatVal);
	}
	DWORD dwFin2 = GetTickCount();

	printf("%d\r\n", dwFin1-dwDeb1);
	printf("%d\r\n", dwFin2-dwDeb2);

	system("PAUSE");
	return 0;
}