The role of strcat in c language

The strcat function in C language is used to concatenate two strings, append the source string src to the end of the target string dest, and store the splicing result in dest.

The role of strcat function in C language

Definition:

## The #strcat function (string concatenation) is a string processing function used to concatenate two strings.

Syntax:

<code class="c">char *strcat(char *dest, const char *src);</code>

Parameters:

• dest: target string, Used to store the concatenated string.
• src: Source string, the string to be added to the target string.

Return value:

Returns a pointer to the concatenated string (i.e.

dest).

Detailed explanation of its function:

The strcat function appends the source string

src to the end of the target string dest. The spliced ​​string is stored in dest, and the length of dest will be automatically extended.

Note:

You must ensure that the target string
• dest has enough memory space to accommodate the spliced ​​string.
If the destination string
• dest is not itself a string, the function behavior is undefined.
If one of the strings contains a null character ('\0'), the function will stop concatenation, and the characters after the null character will not be included in the splicing result.

Example:

<code class="c">char dest[50] = "Hello";
char src[] = "World";

strcat(dest, src);

printf("%s\n", dest); // 输出: HelloWorld</code>

In the above example, the source string "World" is appended to the end of the target string "Hello", forming a new The string "HelloWorld" is stored in the

dest array.

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