Java写题解的第1天:取近似值
三种常见思路,见代码注释
import java.io.*; public class Main { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); float f = Float.parseFloat(br.readLine()); br.close(); System.out.println(multiply2ThenMinus(f)); } // 方法一:乘2强制转int,再减去本身强制转int public static int multiply2ThenMinus(float f) { return (int)(f*2) - (int)f; } // 方法二:加0.5强制转换int public static int plusHalf(float f) { return (int)(f+0.5); } // 方法三:乘10强制转换int,再判断个位数和5的大小 public static int judge(float f) { int n = (int)(f * 10); return (n % 10 < 5)? n / 10 : n / 10 + 1; } }