生成调和级数的 Java 程序
调和级数是算术级数的倒数。一般来说，a 调和级数中的术语可以表示为
h1 = 1/a，h2 = 1/(a+d)，h3 = 1/(a+2d)，H4 = 1/(a+3d)………..，hn = 1/(a+nd)。
其中 h 为调和级数， a 为等差数列d为等差数列与 n 之间的公差为第 n 项。
例 1:(使用 while 循环)
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Generate Harmonic Series
class HarmonicSeries {
// this is a main function
public static void main(String args[])
{
// num is the number of values we want in a series
int num = 5;
double result = 0.0;
System.out.println("The harmonic series is: ");
// printing the harmonic series till num value
// using while loop
while (num > 0) {
// calculating harmonic values
result = result + (double)1 / num;
// after calculating harmonic value
// decrementing num by 1 which means the common
// difference is 1
num--;
System.out.print(result + ", ");
}
}
}
Output
The harmonic series is:
0.2, 0.45, 0.7833333333333333, 1.2833333333333332, 2.283333333333333,
例 2:(用于循环)
Java
// Java Program to Generate Harmonic Series
class HarmonicSeries {
// this is a main function
public static void main(String args[])
{
// num is the number of values we want in a series
int num = 5;
double result = 0.0;
System.out.println("The harmonic series is: ");
// printing the harmonic series till num value
// using for loop
for (int i = num; i > 0; i--) {
// calculating harmonic values
result = result + (double)1 / i;
System.out.print(result + ", ");
}
}
}
输出
The harmonic series is:
0.2, 0.45, 0.7833333333333333, 1.2833333333333332, 2.283333333333333,
例 3:
爪哇
// Java Program to Generate Harmonic Series
// importing necessary java packages
import java.util.Scanner;
import java.lang.*;
class HarmonicSeries {
// this is a main function
public static void main(String args[])
{
// scanner class is a pre-defined class in java
// for taking input from keyboard
Scanner in = new Scanner(System.in);
System.out.print("Enter Number: ");
// storing input value in num
int num = in.nextInt();
double result = 0.0;
System.out.println("The harmonic series is: ");
// printing the harmonic series till num value
// using for loop
for (int i = num; i > 0; i--) {
// calculating harmonic values
result = result + (double)1 / i;
System.out.print(result + ", ");
}
}
}
输出
$ javac HarmonicSeries.java
$ java HarmonicSeries
Enter Number: 5
The harmonic series is:
0.2, 0.45, 0.7833333333333333, 1.2833333333333332, 2.283333333333333
$ javac HarmonicSeries.java
$ java HarmonicSeries
Enter Number: 6
The harmonic series is:
0.16666666666666666, 0.3666666666666667, 0.6166666666666667, 0.95, 1.45, 2.45
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