C ++中的lrint()和llrint()
在本节中,我们将在C++中看到lrint()和llring()。首先让我们讨论一下lrint()。
该lrint()函数用于使用当前舍入模式将自变量中的分数给定值舍入为整数值。当前模式通过使用fesetround()。>=确定
此lrint()函数将double或float或integer值作为输入参数,并通过将小数部分舍入为整数部分来返回longint值。
示例
#include <cfenv>
#include <cmath>
#include <iostream>
using namespace std;
main() {
int x = 40;
long int res;
fesetround(FE_DOWNWARD); // setting rounding direction to DOWNWARD as downward
res = lrint(x);
cout << "Downward rounding of " << x << " is " << res << endl;
}输出结果
Downward rounding of 40.0235 is 40
该llrint()函数用于使用当前舍入模式将自变量中的分数给定值舍入为整数值。当前模式通过使用确定fesetround()。
此lrint()函数将double或float或integer值作为输入参数,并通过将小数部分舍入为整数部分来返回longlongint值。
示例
#include <cfenv>
#include <cmath>
#include <iostream>
using namespace std;
main(){
double a;
long int res;
fesetround(FE_UPWARD); //set rounding direction to upward
a = 40.3;
res = llrint(a);
cout << "Upward rounding of " << a << " is " << res << endl;
fesetround(FE_DOWNWARD); //set rounding direction to downward
a = 40.88;
res = llrint(a);
cout << "Downward rounding of " << a << " is " << res << endl;
}输出结果
Upward rounding of 40.3 is 41 Downward rounding of 40.88 is 40