Twin primes(雙生質數) are a pair of prime numbers that differ by 2. For example, 3 and 5 are twin primes, 5 and 7 are twin primes, and 11 and 13 are twin primes. Write a program to find all twin primes less than 1,000. Display the output as follows:
(3,5)
(5,7)
...
2014年12月27日 星期六
java程式設計題目---公式計算【梅森質數(使用method)】
A prime number is called a Mersenne prime(梅森質數) if it can be written in the form 2^p-1 for some positive integer p.
Write a program that finds all Mersenne prime with p<=31 and displays the output as follows:
p 2^p-1
2 3
3 7
5 31
...
Write a program that finds all Mersenne prime with p<=31 and displays the output as follows:
p 2^p-1
2 3
3 7
5 31
...
2014年12月26日 星期五
java程式設計題目---數字處理【迴文質數判斷(使用method)】
A palindromic prime is a prime number and also palindromic. For example, 131 is a prime and also a palindromic prime, as are 313 and 757. Write a program that displays the first 100 palindromic prime numbers. Display 10 numbers line, separated by exactly one space, as follows:
2 3 5 7 11 101 131 151 181 191
313 353 373 383 727 757 787 797 919 929
2 3 5 7 11 101 131 151 181 191
313 353 373 383 727 757 787 797 919 929
java程式設計題目---數字處理【迴文判斷(使用method)】
Write the methods with the following headers:
public static int reverse(int number)
public static Boolean isPalindrome(int number)
Use the reverse method to implement isPalindrome. A number is a palindrome if its reversal is the same as itself. Write a test program that prompts the user to enter an integer and reports whether the integer is a palindrome.
public static int reverse(int number)
public static Boolean isPalindrome(int number)
Use the reverse method to implement isPalindrome. A number is a palindrome if its reversal is the same as itself. Write a test program that prompts the user to enter an integer and reports whether the integer is a palindrome.
java程式設計題目---數字處理【數值反轉(使用method)】
Write a method with the following header to display an interger in reverse order:
public static int reverse(int number)
For example, reverse(3456) displays 6543. Write a test program that promotes the user to enter an integer and displays its reversal.
public static int reverse(int number)
For example, reverse(3456) displays 6543. Write a test program that promotes the user to enter an integer and displays its reversal.
java程式設計題目---字母處理【輸出字母、換行(使用method)】
Write a method that prints characters using the following header:
public static void printChars(char ch1, char ch2, int numberPerLine)
This method prints the characters between ch1 and ch2 with the specified numbers per line. Write a test program the prints ten characters per line from 1 to Z. Character are separated by exactly one space.
public static void printChars(char ch1, char ch2, int numberPerLine)
This method prints the characters between ch1 and ch2 with the specified numbers per line. Write a test program the prints ten characters per line from 1 to Z. Character are separated by exactly one space.
java程式設計題目---圖形繪製【使用2的n次方印三角形(使用method)】
Write a method to display a pattern as follows:
1
1 2
1 2 4
1 2 4 8
...
1 2 4 8 ....
The method header is
public static void displayPattern(int n)
1
1 2
1 2 4
1 2 4 8
...
1 2 4 8 ....
The method header is
public static void displayPattern(int n)
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