2024年4月15日发(作者：)
linux c 字符串常量定义的几种方式
英文版
Title: Several Methods of Defining String Constants in Linux
C
In the Linux C programming environment, defining string
constants is a fundamental task that often arises. Here are
several common methods to accomplish this:
Direct Assignment:
The simplest way to define a string constant is by directly
assigning it to a character array. For example:
cCopy char str[] = "Hello, World!";
char str[] = "Hello, World!";
In this case, the compiler automatically allocates memory for
the array, including the null terminator.
2. Using String Literals:
String literals are constant character arrays that can be
assigned to pointer variables. However, modifying a string literal
is undefined behavior. For instance:
cCopy char *ptr = "Hello, World!";
char *ptr = "Hello, World!";
Here, ptr points to a read-only memory location where the
string literal is stored.
3. Using the const Keyword:
When you want to ensure that a string won't be modified,
you can use the const keyword. This is especially useful when
passing strings to functions that shouldn't modify them:
cCopy const char *constStr = "Immutable String";
const char *constStr = "Immutable String";
Initializing with String Literals and Modifying Copies:
If you want to modify a string while still using a string literal
as a starting point, you can create a copy of the string literal
and then modify that copy:
cCopy char modifiableStr[] = "Original String";
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