fmin

返回入参的最小值。

接口定义

C interface：

float fmaxf(float x, float y);

double fmax(double x, double y);

参数

参数名	类型	描述	输入/输出
x	在fminf中，x是单精度浮点类型。在fmin中，x是双精度浮点类型。	表示输入数据的浮点值。	输入
y	在fminf中，y是单精度浮点类型。在fmin中，y是双精度浮点类型。	表示输入数据的浮点值。	输入

返回值

返回x，y中的较小值。
其他特殊值参考如下说明。

输入值（x）	输入值（y）	返回值
any	qnan	x
qnan	any	y
any	snan	nan
snan	any	nan

依赖

C: "km.h"

示例

C interface：

    // typical usage
    double x1 = 0.0, x2 = -0.0, x3 = 1.4, x4 = -2.7;
    double y1 = -0.0, y2 = 0.0, y3 = 1.5, y4 = -2.1;
    // special handing
    double a = INFINITY, b = -INFINITY, c = NAN;
    printf("fmin(0.0, -0.0) = %.15f\n", fmin(x1, y1));
    printf("fmin(-0.0, 0.0) = %.15f\n", fmin(x2, y2));
    printf("fmin(1.4, 1.5) = %.15f\n", fmin(x3, y3));
    printf("fmin(-2.7, -2.1) = %.15f\n", fmin(x4, y4));
    printf("fmin(INFINITY, 1.4) = %.15f\n", fmin(a, x3));
    printf("fmin(-INFINITY, -2.7) = %.15f\n", fmin(b, x4));
    printf("fmin(NAN, 1.4) = %.15f\n", fmin(c, x3));
    printf("fmin(NAN, INFINITY) = %.15f\n", fmin(c, a));
    printf("fmin(NAN, -INFINITY) = %.15f\n", fmin(c, b));
    printf("fmin(INFINITY, -INFINITY) = %.15f\n", fmin(a, b));
    /* 
     *fmin(0.0, -0.0) = -0.000000000000000
     *fmin(-0.0, 0.0) = -0.000000000000000
     *fmin(1.4, 1.5) = 1.400000000000000
     *fmin(-2.7, -2.1) = -2.700000000000000
     *fmin(INFINITY, 1.4) = 1.400000000000000
     *fmin(-INFINITY, -2.7) = -inf
     *fmin(NAN, 1.4) = 1.400000000000000
     *fmin(NAN, INFINITY) = inf
     *fmin(NAN, -INFINITY) = -inf
     *fmin(INFINITY, -INFINITY) = -inf
     * */

父主题： 杂项函数