Function of strcpy in c language

The strcpy function is a function used for string copying in C language. Its function is to copy the contents of the source string to the target string. Its usage is strcpy(char dest, const char src), where dest is the destination string address and src is the source string address. Things to note include ensuring that the destination string has enough space to accommodate the source string, and that the source string is null-terminated.

Function of strcpy function

The strcpy function is a standard library function in C language for string copying. Its function is to copy the contents of one string (source string) to another string (target string).

Usage

The prototype of the strcpy function is as follows:

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

Among them:

• dest : The address of the target string.
• src: The address of the source string.

Return value

The strcpy function returns a pointer to the target string dest.

Working principle

The strcpy function copies the contents of the source string src character by character to the target string dest Come to work. When copying is complete or a null character ('\0') is encountered, copying stops and adds a null character to the end of the target string.

Things to note

• Destination stringdest There must be enough space to accommodate the source stringsrc# The contents of ##, including null characters.
If the destination string
• dest does not have enough space to accommodate the contents of the source string src, a buffer overflow error may occur. The
strcpy function does not check whether the source string
• src is null-terminated. Therefore, it is important to ensure that the source string is null-terminated.
The strcpy function does not change the content of the source string
• src.

Example

The following example shows how to use the strcpy function to copy a string:

<code class="c">#include <stdio.h>
#include <string.h>

int main() {
    char dest[100];
    char src[] = "Hello World";

    strcpy(dest, src);

    printf("Copied string: %s\n", dest);

    return 0;
}</code>

Output:

<code>Copied string: Hello World</code>

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