نمایش اعداد اعشاری double در جاوا

خلاصه مطلب

چطور یک عدد از نوع double را تا دو رقم اعشار در جاوا نمایش دهیم؟

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زمان مطالعه۱ دقیقه مطالعه

آخرین ویرایش۲۲ فروردین ۱۳۹۷

package start1397;public class Test2 { public static void main(String[] args) { doublea = 4.750089651125; } }

package start1397;public class Test2 { public static void main(String[] args) { doublea = 4.750089651125; System.out.println("value of a= "+a); } }

Output:value of a= 4.750089651125

package start1397;public class Example1 { public static void main(String[] args) { inta = 55; System.out.printf("%d", a); } }

Output: 55

System.out.printf("%d", a);

package start1397;public class Example1 { public static void main(String[] args) { double a = 55.365; System.out.printf("%f", a); }}

Output:55.365000

System.out.printf("%f", a);

package start1397;public class Example1 { public static void main(String[] args) { doublea = 55.365; System.out.printf("%.3f", a); } }

Output: 55.365

System.out.printf("%.3f", a);

System.out.printf("%.4f", a);

package start1397;public class Test2 { public static void main(String[] args) { doublea = 4.750089651125; System.out.printf("value of a= %.2f", a); } }

Output: value of a= 4.75

package start1397;public class Test1 { // https://t.me/javalike public static void main(String[] args) { doublea = 2.5; doubleb = 4.75; doublesum = a + b; System.out.printf("%.2f",sum); } }

Output: 7.25

package start1397;public class Test1 { // https://t.me/javalike public static void main(String[] args) { doublea = 2.154357; doubleb = 4.852147369147; System.out.printf("a=%.1f\nb=%.9f ", a, b); } }

Output:a=2.2 b=4.852147369

کلاس String

package start1397;public class Test1 { // https://t.me/javalike public static void main(String[] args) { double a = 66.12369874; String str = String.format("%.2f", a); System.out.println(str); } }

Output: 66.12

String str = String.format("%.2f", a);

System.out.println(str);

package start1397;import java.util.Scanner;public class Test1 { // https://t.me/javalike public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("Enter num1"); doublea = input.nextDouble(); System.out.println("Enter num2"); doubleb = input.nextDouble(); doublesum = a + b; String str = String.format("%.2f", sum); System.out.println("Out: "+ str); } }

Output:Enter num1 5.6689Enter num2 1.8654 Out: 7.53