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法律研究Java 程式將一個數字四捨五入到 n 個小數位
在本文中，我們將瞭解如何將數字四捨五入到 n 個小數位。十進位制值的四捨五入使用 CEIL 或 FLOOR 函式完成。
以下是其演示 −
輸入
假設我們的輸入是 −
Input : 3.1415
輸出
所需的輸出將是 −
Output : 3.2
演算法
Step 1 - START Step 2 - Declare a float variable values namely my_input. Step 3 - Read the required values from the user/ define the values Step 4 – Use the CEIL function to round the number to the required decimal places. In this example we are rounding up to 2 decimal places. Store the result. Step 5- Display the result Step 6- Stop
示例 1
在此，輸入是由使用者根據提示輸入的。您可以在我們的 編碼基礎工具 
中即時嘗試此示例。
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.Scanner;
public class DecimalFormatting {
public static void main(String[] args) {
float my_input;
System.out.println("Required packages have been imported");
Scanner my_scanner = new Scanner(System.in);
System.out.println("A scanner object has been defined ");
System.out.print("Enter the first binary number : ");
my_input = my_scanner.nextFloat();
DecimalFormat roundup_decimal = new DecimalFormat("#.#");
roundup_decimal.setRoundingMode(RoundingMode.CEILING);
System.out.println("The rounded up value of " +my_input + " is ");
System.out.println(roundup_decimal.format(my_input));
}
}輸出
Required packages have been imported A scanner object has been defined Enter the first binary number : 3.1415 The decimal number is defined as 3.1415 The rounded up value of 3.1415 is 3.2
示例 2
在此，整數已預先定義，並訪問其值並顯示在控制檯上。
import java.math.RoundingMode;
import java.text.DecimalFormat;
public class DecimalFormatting {
public static void main(String[] args) {
System.out.println("Required packages have been imported");
double my_input = 3.1415;
System.out.println("The decimal number is defined as " +my_input);
DecimalFormat roundup_decimal = new DecimalFormat("#.#");
roundup_decimal.setRoundingMode(RoundingMode.CEILING);
System.out.println("The rounded up value of " +my_input + " is ");
System.out.println(roundup_decimal.format(my_input));
}
}輸出
Required packages have been imported The decimal number is defined as 3.1415 The rounded up value of 3.1415 is 3.2
更新於：21-Feb-2022
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