2_Computer Science Grade 10 String_manipulation presentation 1 2variant

String manipulation

10.4.1.2 use procedures and functions for string manipulation

Character Strings

A sequence of characters is often referred to as a character “string”.
A string is stored in an array of type char ending with the null character '\0 '.

A string containing a single character takes up 2 bytes of storage.

Character Strings

Character Strings

Character Strings

Character vs. String

A string constant is a sequence of characters enclosed in double quotes.
For example, the character string:
char s1[2]="a"; //Takes two bytes of storage.
s1:

On the other hand, the character, in single quotes:
char s2= `a`; //Takes only one byte of storage.
s2:

Character vs. String

Task 1

Answer the questions using Internet resources (videos, texts, images):
How to describe a string?
How to input a string?
How to output a string?

10

Descriptors:
Student
correctly writes the describe string function;
correctly writes the input string function;
correctly writes the output string function.

Example 1

char message1[12] = "Hello world";
cout << message1 << endl;

message1:


char message2[12];
cin >> message2; // type "Hello" as input

message2:

Example 2: String I/O

String can be input using the extraction operator >>, but one or more white spaces indicates the end of an input string.
char A_string[80], E_string[80];
cout << "Enter some words in a string:\n";
cin >> A_string >> E_string;
cout << A_string << E_string
<< “\nEND OF OUTPUT\n";

Output:
Enter some words in a string:
This is a test.
Thisis
END OF OUTPUT

Watch the video and write the functions for string manipulation.

13

Descriptors:
Student
correctly writes the string functions;
correctly describes their purpose.

Video

14

Write a program to the first task of other group students.

15

Descriptors:
Student
- correctly writes the string functions;
- correctly writes a procedure and the main program.

Write a program to the second task of other group students.

16

Descriptors:
Student
- correctly writes the string functions;
- correctly writes a procedure and the main program.

Reflection

17