round()函数以及C ++中的示例
C ++round()
函数
round()函数是cmath标头的库函数,用于对最接近该数字的给定值进行舍入,将中途情况舍入为零,然后接受一个数字并返回舍入后的值。
round()
函数语法:
round(x);
参数: x –是中途取整的数字,最接近零。
返回值: double-返回double类型值,该值是数字x的舍入值。
示例
Input:float x = 2.3;
Function call:
round(x);
Output:
2
Input:
float x = 2.8;
Function call:
round(x);
Output:
3
C ++代码演示round()
函数示例
//示例// round()功能
#include <iostream>
#include <cmath>
using namespace std;
// main()部分
int main(){
float x;
x = 15.3;
cout<<"round("<<x<<"): "<<round(x)<<endl;
x = 15.5;
cout<<"round("<<x<<"): "<<round(x)<<endl;
x = 15.8;
cout<<"round("<<x<<"): "<<round(x)<<endl;
x = -15.3;
cout<<"round("<<x<<"): "<<round(x)<<endl;
x = -15.5;
cout<<"round("<<x<<"): "<<round(x)<<endl;
x = -15.8;
cout<<"round("<<x<<"): "<<round(x)<<endl;
return 0;
}
输出结果
round(15.3): 15round(15.5): 16
round(15.8): 16
round(-15.3): -15
round(-15.5): -16
round(-15.8): -16
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