---
title: finite
description: "判断输入值x是否为有限数，返回值类型为整型数。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_kml_16_0790.html
sourcePath: /source/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_kml_16_0790.html
indexId: 0915a4936722720daf334375634561d3c9bc2952145b95f50f77c414a14c838576
---
# finite

判断输入值x是否为有限数，返回值类型为整型数。

#### 接口定义

C interface：

int finitef(float x);

int finite(double x);


#### 参数

| 参数名 | 类型 | 描述 | 输入/输出 |
| --- | --- | --- | --- |
| x | 在finitef中，x是单精度浮点类型。 在finite中，x是双精度浮点类型。 | 表示输入数据的浮点值。 | 输入 |


#### 返回值

- 返回判断x是否为有限数。
- 输入浮点数，返回1。
- 输入±∞，返回0。
- 输入nan，返回0。


#### 依赖

C: "km.h"


#### 示例

C interface：
```
// typical usage
double x1 = 0.0, x2 = -0.0, x3 = 1.5, x4 = -2.5;
// special handing
double a = INFINITY, b = -INFINITY, c = NAN;
// print result
printf("finite(0.0) = %d\n", finite(x1));
printf("finite(-0.0) = %d\n", finite(x2));
printf("finite(1.5) = %d\n", finite(x3));
printf("finite(-2.5) = %d\n", finite(x4));
printf("finite(INFINITY) = %d\n", finite(a));
printf("finite(-INFINITY) = %d\n", finite(b));
printf("finite(NAN) = %d\n", finite(c));
/*
* finite(0.0) = 1
* finite(-0.0) = 1
* finite(1.5) = 1
* finite(-2.5) = 1
* finite(INFINITY) = 0
* finite(-INFINITY) = 0
* finite(NAN) = 0
*
* */
```