90 строки
1.8 KiB
C
90 строки
1.8 KiB
C
#include <math.h>
|
|
#include <assert.h>
|
|
#include <float.h>
|
|
#include <stdio.h>
|
|
|
|
union fi
|
|
{
|
|
float f;
|
|
unsigned int i;
|
|
};
|
|
|
|
unsigned int Float2Int(float f)
|
|
{
|
|
union fi a;
|
|
a.f = f;
|
|
return a.i;
|
|
}
|
|
|
|
float Fminf(float x, float y)
|
|
{
|
|
if (x < y || !(y == y))
|
|
return x;
|
|
else if (y < x || !(x == x))
|
|
return y;
|
|
else if (x != 0.f)
|
|
return x;
|
|
else
|
|
return Float2Int(x) == 0 ? y : x;
|
|
}
|
|
|
|
float Fmaxf(float x, float y)
|
|
{
|
|
if (x > y || !(y == y))
|
|
return x;
|
|
else if (y > x || !(x == x))
|
|
return y;
|
|
else if (x != 0.f)
|
|
return x;
|
|
else
|
|
return Float2Int(x) == 0 ? x : y;
|
|
}
|
|
|
|
void TestMin(float a, float b, float ret)
|
|
{
|
|
float x = Fminf(a, b);
|
|
if (x != ret)
|
|
printf("min(%f, %f) returned %f, should return ret: %f\n", a, b, x, ret);
|
|
assert(Float2Int(x) == Float2Int(ret));
|
|
float y = Fminf(b, a);
|
|
if (y != ret)
|
|
printf("min(%f, %f) returned %f, should return ret: %f\n", b, a, y, ret);
|
|
assert(Float2Int(y) == Float2Int(ret));
|
|
}
|
|
|
|
void TestMax(float a, float b, float ret)
|
|
{
|
|
float x = Fmaxf(a, b);
|
|
if (x != ret)
|
|
printf("max(%f, %f) returned %f, should return ret: %f\n", a, b, x, ret);
|
|
assert(Float2Int(x) == Float2Int(ret));
|
|
float y = Fmaxf(b, a);
|
|
if (y != ret)
|
|
printf("max(%f, %f) returned %f, should return ret: %f\n", b, a, x, ret);
|
|
assert(Float2Int(y) == Float2Int(ret));
|
|
}
|
|
|
|
int main()
|
|
{
|
|
TestMin(-INFINITY, INFINITY, -INFINITY);
|
|
TestMax(-INFINITY, INFINITY, INFINITY);
|
|
|
|
TestMin(-INFINITY, 1.f, -INFINITY);
|
|
TestMax(-INFINITY, 1.f, 1.f);
|
|
|
|
TestMin(INFINITY, 1.f, 1.f);
|
|
TestMax(INFINITY, 1.f, INFINITY);
|
|
|
|
TestMin(-INFINITY, NAN, -INFINITY);
|
|
TestMax(-INFINITY, NAN, -INFINITY);
|
|
assert(Float2Int(0.0f) != Float2Int(-0.0f));
|
|
|
|
if (NAN == NAN)
|
|
printf("NAN == NAN\n");
|
|
if (NAN != NAN)
|
|
printf("NAN != NAN\n");
|
|
TestMin(-0.0f, 0.0f, -0.0f);
|
|
TestMax(-0.0f, 0.0f, 0.0f);
|
|
printf("Success!\n");
|
|
}
|