o_195h4n6al16jb186b1b2qs7fgssa.pdf

errno = 0;
x = 2.0F;
y = log10f(x);
if (errno)
perror("Error");
printf("The base-10 logarithm of %f is %f\n\n",
x, y);
errno = 0;
x = 0.0F;
y = log10f(x);
if (errno)
perror("Error");
printf("The base-10 logarithm of %f is %f\n\n",
x, y);
errno = 0;
x = -2.0F;
y = log10f(x);
if (errno)
perror("Error");
printf("The base-10 logarithm of %f is %f\n\n",
x, y);
}
Output:
The base-10 logarithm of2.000000 is 0.301030
Error: domain error
The base-10 logarithm of0.000000 is -inf
Error: domain error
The base-10 logarithm of -2.000000 is nan
dsPIC
®
Language Tools Libraries
DS51456B-page 352 2004 Microchip Technology Inc.
logf
Description: Calculates the natural logarithm of a single precision floating point
value.
Include:
Prototype: float logf(float x);
Argument: x any positive value for which to return the log
Return Value: Returns the natural logarithm of x. -infis returned if xis 0 and
if (errno)
perror ("Lỗi");
printf ("% f% f nâng lên là% f \ n \ n", x, y, z);
errno = 0;
x = 3,0;
y = -0,5;
z = pow (x, y);
if (errno)
perror ("Lỗi");
printf ("% f% f nâng lên là% f \ n \ n", x, y, z);
errno = 0;
x = 4,0;
y = 0.0;
z = pow (x, y);
if (errno)
perror ("Lỗi");
printf ("% f% f nâng lên là% f \ n \ n", x, y, z);
errno = 0;
x = 0,0;
y = -3,0;
z = pow (x, y);
if (errno)
perror ("Lỗi");
printf ("% f% f nâng lên là% f \ n \ n", x, y, z);
}
Đầu ra:
-2,000000 Nâng lên 3,000000 là -8,000000
3.000000 nâng lên -,500000 là 0,577350
4.000000 nâng lên là 0.000000 1.000000
Lỗi: lỗi miền
0.000000 nâng lên -3,000000 là inf
dsPIC
®
Thư viện Công cụ Ngôn ngữ
DS51456B trang 356 2004 Microchip Technology Inc
powf
Mô tả: Tính x lũy thừa y.
Bao gồm:
Prototype: powf nổi (float x, float y);