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分段函数求值
Time Limit: 1000 ms Memory Limit: 65536 KiB
Submit Statistic
Problem Description
有如下分段函数
F(x) = x^2 + 1 当x> 0时；
F(x) = -x 当x<0时；
F(x) = 100.0 当x=0时；
编程根据输入的不同x（x为实数），输出其对应的函数值
Input
多组输入，每组一个实数x。处理到文件结束。
Output
对于每组输入x，输出其对应的F(x),每组一行，结果保留1位小数。
Sample Input
8.00
-5.0
Sample Output
65.0
5.0
Hint
import java.text.DecimalFormat; import java.util.Scanner; public class Main {
public static void main(String[] args) { Scanner str = new Scanner(System.in);
DecimalFormat df =new DecimalFormat("0.0"); double x, y; while(str.hasNext()) {
x = str.nextDouble();if(x > 0) { y = x * x + 1; } else if(x < 0) { y = - x; }
else y = 100.0; System.out.println(df.format(y)); } str.close(); } }
