How is the function strcpy used in C language?

1 year ago
Liam
1 minute

The strcpy function is used to copy one string to another. Its syntax is:

char *strcpy(char *dest, const char *src);

In this case, dest is the target string, while src is the source string to be copied.

There are a few things to keep in mind when using the strcpy function:

  1. The destination string dest must be large enough to accommodate the content of the source string src as well as the null character at the end.
  2. After the string is copied, the destination string dest will be terminated with a null character ‘\0’.
  3. The source string src can be a string constant, character array, or pointer to a string.
  4. The return value is a pointer that points to the destination string, dest.

Sample code:

#include <stdio.h>
#include <string.h>

int main() {
    char src[] = "Hello, World!";
    char dest[20];
    
    strcpy(dest, src);
    
    printf("源字符串src：%s\n", src);
    printf("目标字符串dest：%s\n", dest);
    
    return 0;
}

In the above sample code, the source string “Hello, World!” is copied to the target string dest, and the contents of both strings are ultimately displayed.

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