Do you know how to represent string constants?

Do you know how string constants can be represented?

In computer programming, string is a commonly used data type used to represent sequences of text. In many programming languages, string constants can be represented in different ways. Next, I will give some common methods and attach code examples.

1. Use double quotes ("") to represent
   This is the most common way and is the way used by most programming languages. String constants can be directly enclosed in double quotes.

Sample code (Python):

str1 = "Hello, world!"

2. Use single quotes ('') to represent
   Some programming languages ​​allow the use of single quotes to represent string constants. Compared with double quotes, there is no substantial difference between the two.

Sample code (JavaScript):

var str2 = 'Hello, world!';

3. Use triple quotes (""") or (''') to represent multi-line strings
   When a string When it needs to span multiple lines, triple quotes are used to represent string constants for code readability.

Sample code (Java):

String str3 = """
    This is a 
    multi-line
    string.
    """;

4. Escape characters () represents special characters
   In order to represent some special characters, such as quotation marks, newline characters, etc., we need to use escape characters. In this way, the compiler will treat the characters following the escape characters as part of the string.

Sample code (C):

char str4[] = "This is a "quoted" string.";

5. Using Unicode to represent special characters
   Sometimes, we need to represent some special characters, such as non-ASCII characters, control characters, etc., It can be represented using Unicode encoding.

Sample code (Python):

str5 = "u03B1u03B2u03B3"  # 表示希腊字母alpha、beta、gamma

The above are just some common ways to represent string constants. Different programming languages ​​may have some subtle differences. Difference. With these methods, we can easily use string constants in code to implement various functions and text processing needs.

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