Usage of strcpy in c language

The strcpy function is used to copy strings in C language, and the syntax is char strcpy(char dest, const char* src). It copies the source string src into the destination string dest, but the destination string must have enough space and the source string must be terminated by the null character '\0'. The strcpy function does not verify the validity of the input. When the source string is longer than the target string, the target string will be truncated and no null character will be added to the end of the target string.

strcpy function usage in C language

strcpy function is a function used to copy in C language Standard library functions for strings. It allows copying the contents of one string into another string.

Syntax:

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

Parameters:

• dest: The destination character to which the source string is to be copied. string.
• src: The source string to be copied to the destination string.

Return value:

Returns a pointer to the target string.

Usage:

When using the strcpy function to copy a string, you should pay attention to the following points:

• The destination string must be Large enough to hold the source string. If the target string is too small, buffer overflow will occur.
• The source string must end with the null character '\0'. Otherwise, the strcpy function will keep copying until it encounters a null character.
• The strcpy function does not check whether the source or target string is valid. It assumes the input is valid and does not validate it.

Example:

<code class="c">char dest[100];
char src[] = "Hello, world!";

strcpy(dest, src);

printf("复制后的字符串：%s\n", dest);  // 输出：Hello, world!</code>

In this example, the src string is copied into the dest string. The dest string has enough space to hold the src string, and the src string is null-terminated. Therefore, the strcpy function successfully copies the source string into the destination string.

Notes:

When using the strcpy function, you should pay attention to the following precautions:

• If the source string is larger than the target string long, the target string will be truncated.
• The strcpy function does not add null characters to the end of the target string. If you need to add null characters, use the strcpy_s function.

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