题解 | #实现四舍五入#

方法一：利用java自己的api

public class Main{
    public static void main(String [] args){
        Scanner scanner=new Scanner(System.in);
        float f=scanner.nextFloat();
        System.out.print(Math.round(f));
    }
}

方式二:利用强制类型转换 大于0的数据加0.5再进行强制类型转换

public class Main{
    public static void main(String [] args){
        Scanner scanner=new Scanner(System.in);
        double f=scanner.nextDouble();
       if(f>=0){
         System.out.print((int)(f+0.5));
    }else{
    System.out.print((int)(f-0.5))}
}