C++ Math rint()
C++ Math rint()
该函数使用当前舍入模式将给定值舍入为最接近的整数。当前的舍入模式由fesetround()确定。
例如:
rint(7.9) = 8;
if, fesetround(FE_DOWNWARD) then,
rint(7.9) = 7;
语法
假设一个数字" x"。语法为:
return_type rint(data_type x);
注意: return_type可以是float，double或long double。
参数
x : 该值可以是float或double。
返回值
它返回x的舍入值。
示例1
让我们看一个简单的示例。
#include <iostream>
#include<math.h>
#include <cfenv>
using namespace std;
int main()
{
float x=9.9;
std::cout << "Value of x is :" <<x<< std::endl;
std::cout << "Rounding to nearest,value is :" <<rint(x)<< std::endl;
fesetround(FE_UPWARD);
std::cout << "Rounding to upward,value is :" <<rint(x)<< std::endl;
fesetround(FE_DOWNWARD);
std::cout << "Rounding to downward,value is :" <<rint(x)<< std::endl;
return 0;
}
输出:
Value of x is :9.9
Rounding to nearest,value is :10
Rounding to upward,value is :10
Rounding to downward,value is :9
