C # knowledge point test

1,String processing problems

Problem description: cyclically receives a string greater than 3 from the keyboard and can be input cyclically. Complete the following functions:

(1) Length of the output string.

(2) the first occurrence of the letter a in the output string.

(3) number of times the substring AB appears in the output string.

(4) After the string contains 3rd characters, insert the string "C #" and output the new string.

(5) Replace "C #" in the string with "Java" and output the new string.

(6) use the character "c" as the separator to split the string and output the separated string.

Test example:

Input example: AB

Output example: Enter at least 3 Characters

Input example: 123abcabc123

Output example: the string length is 12.

The first occurrence of letter a is 3

The substring AB appears twice.

The new string after insertion is 123C # abcabc123

The new string after replacement is 123Javaabcabc123.

The split string using c is:

123 Javaab

AB

123

2. Classes and objects

A parent class:

Age and name (attribute)

Method with return value: speak ()

Two methods without return values: one has a parameter, the other has no parameters, and both methods are sing;

A method without return values: There are two parameters: age and name. The method is Info ();

One child subclass: inherits the parent class

Override the father's Info () method

Write Other content as needed

A daughter class: inherits the father class

There are two shopping methods: goShopping (), goShopping (string clothesName, double clothesPrice );

Override the father's Info ();

3. Date:

Input a date from the keyboard in the format of yyyy-mm-dd

Calculate the number of days between the date and January 1, October 1, 1949.

For example:

User entered: 1949-10-02

Program output: 1

User entered: 1949-11-01

Program output: 31