[Dark horse programmer] basic test questions !, Dark Horse programmer

[Dark horse programmer] basic test questions !, Dark Horse programmer

1. Compile the program to calculate the sum of 12 + 22 + 32 +... + 1002.

A:

 

2. List some sorting algorithms you know and use Java to achieve a high efficiency.

 

3. Accept a number from the keyboard and list the Chinese representation format of the number. For example, enter 123 on the keyboard to print out One, Two, and Three; enter 3103 on the keyboard to print out Sany and zero.

 

4. Determine whether a string is a symmetric string. For example, "abc" is not a symmetric string, "aba", "abba", "aaa", and "mnanm" are symmetric strings.

 

5. What is the difference between throw and throws? When are try, catch, and finally used? A:

 

6. Program to list the full character combination of a string. The original string does not contain repeated characters, for example:

The original string is "abc". Print all the following combinations:

"A" "B" "c"

"AB" "bc" "ca" "ba" "cb" "ac"

"Abc" "acb" "bac" "bca" "cab" "CBA"

 

7. Compile a function that can get the file extension. The form parameter receives a file name string and returns a string with the extension.

 

8. Print all the three-digit prime numbers programmatically. The prime number features that can only be divisible by 1 and itself.

 

9. Define a static method that receives a List <Integer> and sorts the List in the method.

 

10. Compile an HTML registry ticket with the following fields: User Name, password, Password confirmation, gender (single choice), interests (multiple choice), and city (drop-down list) personal Profile (Text domain)

To verify this form using JavaScript, you must:

1. User name: Within 10 characters including letters, numbers, and underscores (_). It must start with a letter.

2. Password: 6-16 characters

3. Confirm the password.

4. other items are required