cimag
返回复数的虚部的值。
接口定义
C interface：
float cimagf(float complex x);
double cimag(double complex x);
long double cimagl(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的虚部的值y，y ∈ (-INF, +INF)。
依赖
C: "km.h"
示例
C interface：
// 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;
// print result
printf("/*\n");
printf(" * cimag(%.2f + %.2f*I) = %.6f\n", x1, y1, cimag(__builtin_complex(x1, y1)));
printf(" * cimag(%.2f + %.2f*I) = %.6f\n", x2, y2, cimag(__builtin_complex(x2, y2)));
printf(" * cimag(%.2f + %.2f*I) = %.6f\n", x3, y3, cimag(__builtin_complex(x3, y3)));
printf(" * cimag(%.2f + %.2f*I) = %.6f\n", x4, y4, cimag(__builtin_complex(x4, y4)));
printf(" * cimag(%.2f + %.2f*I) = %.6f\n", x5, y5, cimag(__builtin_complex(x5, y5)));
printf(" **/\n");
/*
* cimag(inf + inf*I) = inf
* cimag(2.00 + 3.00*I) = 3.000000
* cimag(-2.50 + -3.40*I) = -3.400000
* cimag(nan + nan*I) = nan
* cimag(0.00 + 0.00*I) = 0.000000
**/
父主题： 复数函数
