std::isinf
Defined in header <cmath> | ? | ? |
|---|---|---|
bool isinf( float arg ); | (1) | (since C++11) |
bool isinf( double arg ); | (2) | (since C++11) |
bool isinf( long double arg ); | (3) | (since C++11) |
bool isinf( Integral arg ); | (4) | (since C++11) |
1-3%29确定给定的浮点数arg是一个正的或负的无穷大。
4%29一组重载或接受from任何论点积分型等效于%282%29%28的参数转换为double29%。
参数
arg | - | floating point value |
|---|
返回值
true如果arg是无限的，false否则。
例
二次
#include <iostream>
#include <cmath>
#include <cfloat>
int main()
{
std::cout << std::boolalpha
<< "isinf(NaN) = " << std::isinf(NAN) << '\n'
<< "isinf(Inf) = " << std::isinf(INFINITY) << '\n'
<< "isinf(0.0) = " << std::isinf(0.0) << '\n'
<< "isinf(exp(800)) = " << std::isinf(std::exp(800)) << '\n'
<< "isinf(DBL_MIN/2.0) = " << std::isinf(DBL_MIN/2.0) << '\n';
}二次
产出：
二次
isinf(NaN) = false
isinf(Inf) = true
isinf(0.0) = false
isinf(exp(800)) = true
isinf(DBL_MIN/2.0) = false二次
另见
fpclassify (C++11) | categorizes the given floating point value (function) |
|---|---|
isfinite (C++11) | checks if the given number has finite value (function) |
isnan (C++11) | checks if the given number is NaN (function) |
isnormal (C++11) | checks if the given number is normal (function) |
c ISINF文件
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