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在头文件<math.h>中定义



float       fminf( float x, float y );

(1)

(自C99)

double      fmin( double x, double y );

(2)

(自C99)

long double fminl( long double x, long double y );

(3)

(自C99)

在头文件<tgmath.h>中定义



#define fmin( x, y )

(4)

(自C99)

1-3）返回两个浮点参数中的较小者，将NaN视为缺失数据（在NaN和数值之间选择数值）。

4）类型 - 通用宏：如果任何参数的类型为long double，则调用fminl。 否则，如果任何参数具有整数类型或具有类型double，则调用fmin。 否则，调用fminf。

参数

x, y

-

floating point values

返回值

如果成功，则返回两个浮点值中较小的一个。返回的值是精确的，并不取决于任何舍入模式。

错误处理

此函数不受math_errhandling中指定的任何错误条件的约束。

如果实现支持IEEE浮点运算（IEC 60559），

  • 如果两个参数之一是NaN，则返回另一个参数的值

  • 只有两个参数都是NaN，才会返回NaN

注意

该函数不要求对零符号敏感，但有些实现额外强制执行，如果一个参数为+0，另一个为-0，则返回-0。

例

#include <stdio.h>#include <math.h>
 int main(void){    printf("fmin(2,1)    = %f\n", fmin(2,1));    printf("fmin(-Inf,0) = %f\n", fmin(-INFINITY,0));    printf("fmin(NaN,-1) = %f\n", fmin(NAN,-1));}

可能的输出：

fmin(2,1)    = 1.000000fmin(-Inf,0) = -inffmin(NaN,-1) = -1.000000

参考

  • C11标准（ISO / IEC 9899：2011）：

    • 7.12.12.3 fmin函数（p：258）

    • 7.25类型通用数学<tgmath.h>（p：373-375）

    • F.10.9.3 fmin函数（p：530）

  • C99标准（ISO / IEC 9899：1999）：

    • 7.12.12.3 fmin函数（p：239）

    • 7.22类型通用数学<tgmath.h>（p：335-337）

    • F.9.9.3 fmin函数（p：466）

扩展内容

isless (C99)

检查第一个浮点参数是否小于第二个（函数）

fmaxfmaxffmax1（C99）（C99）（C99）

决定两个浮点值中较大的一个（函数）

| fmin的C ++文档 |

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