clog10
计算复数以10为底数的对数值。
接口定义
C interface：
float complex clog10f(float complex x);
double complex clog10(double complex x);
long double complex clog10l(long double complex x);
参数
参数名 |
类型 |
描述 |
输入/输出 |
|---|---|---|---|
x |
|
表示输入数据的浮点值。 |
输入 |
返回值
- 返回x的以10为底的对数值结果y。
- 特殊值说明如下所示。
输入值实部（x.real）
输入值虚部（x.imag）
输出值实部（y.real）
输出值虚部（y.imag）
+0
+0
-inf
+0
+0
-0
-inf
-0
+0
inf
inf
0x3fe5d47c4cb2fba1(pi/2ln10)
+0
-inf
inf
0xbfe5d47c4cb2fba1(-pi/2ln10)
+0
snan
nan
nan
+0
-snan
nan
nan
+0
qnan
nan
nan
+0
-qnan
nan
nan
-0
+0
-inf
0x3ff5d47c4cb2fba1(pi/ln10)
-0
-0
-inf
0xbff5d47c4cb2fba1(-pi/ln10)
-0
inf
inf
0x3fe5d47c4cb2fba1(pi/2ln10)
-0
-inf
inf
0xbfe5d47c4cb2fba1(-pi/2ln10)
-0
snan
nan
nan
-0
-snan
nan
nan
-0
qnan
nan
nan
-0
-qnan
nan
nan
inf
+0
inf
+0
inf
-0
inf
-0
inf
inf
inf
0x3fd5d47c4cb2fba1(pi/4ln10)
inf
-inf
inf
0xbfd5d47c4cb2fba1(-pi/4ln10)
inf
snan
inf
nan
inf
-snan
inf
nan
inf
qnan
inf
nan
inf
-qnan
inf
nan
-inf
+0
inf
0x3ff5d47c4cb2fba1(pi/ln10)
-inf
-0
inf
0xbff5d47c4cb2fba1(-pi/ln10)
-inf
inf
inf
0x3ff05f5d39863cb9(3*pi/4ln10)
-inf
-inf
inf
0xbff05f5d39863cb9(-3*pi/4ln10)
-inf
snan
inf
nan
-inf
-snan
inf
nan
-inf
qnan
inf
nan
-inf
-qnan
inf
nan
snan
+0
nan
nan
snan
-0
nan
nan
snan
inf
inf
nan
snan
-inf
inf
nan
snan
snan
nan
nan
snan
-snan
nan
nan
snan
qnan
nan
nan
snan
-qnan
nan
nan
-snan
+0
nan
nan
-snan
-0
nan
nan
-snan
inf
inf
nan
-snan
-inf
inf
nan
-snan
snan
nan
nan
-snan
-snan
nan
nan
-snan
qnan
nan
nan
-snan
-qnan
nan
nan
qnan
+0
nan
nan
qnan
-0
nan
nan
qnan
inf
inf
nan
qnan
-inf
inf
nan
qnan
snan
nan
nan
qnan
-snan
nan
nan
qnan
qnan
nan
nan
qnan
-qnan
nan
nan
-qnan
+0
nan
nan
-qnan
-0
nan
nan
-qnan
inf
inf
nan
-qnan
-inf
inf
nan
-qnan
snan
nan
nan
-qnan
-snan
nan
nan
-qnan
qnan
nan
nan
-qnan
-qnan
nan
nan
依赖
C: "kc.h"
示例
// typical usage
double x1 = INFINITY, y1 = INFINITY;
double x2 = 2.0, y2 = 3.0;
double x3 = -2.5, y3 = -3.4;
double x4 = NAN, y4 = NAN;
double x5 = 0, y5 = 0;
double complex z1 = clog10(__builtin_complex(x1, y1));
double complex z2 = clog10(__builtin_complex(x2, y2));
double complex z3 = clog10(__builtin_complex(x3, y3));
double complex z4 = clog10(__builtin_complex(x4, y4));
double complex z5 = clog10(__builtin_complex(x5, y5));
// print result
printf("/*\n");
printf(" * clog10(%.2f + %.2f*I) = %.6f + %.6f*I\n", x1, y1, __real__(z1), __imag__(z1));
printf(" * clog10(%.2f + %.2f*I) = %.6f + %.6f*I\n", x2, y2, __real__(z2), __imag__(z2));
printf(" * clog10(%.2f + %.2f*I) = %.6f + %.6f*I\n", x3, y3, __real__(z3), __imag__(z3));
printf(" * clog10(%.2f + %.2f*I) = %.6f + %.6f*I\n", x4, y4, __real__(z4), __imag__(z4));
printf(" * clog10(%.2f + %.2f*I) = %.6f + %.6f*I\n", x5, y5, __real__(z5), __imag__(z5));
printf(" **/\n");
/*
* clog10(inf + inf*I) = inf + 0.341094*I
* clog10(2.00 + 3.00*I) = 0.556972 + 0.426822*I
* clog10(-2.50 + -3.40*I) = 0.625332 + -0.957541*I
* clog10(nan + nan*I) = nan + nan*I
* clog10(0.00 + 0.00*I) = -inf + 0.000000*I
**/
