C语言 strcpy()函数

char *strcpy(char *str1, const char *str2)

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

int main () {
   char str1[20];
   char str2[20];

   //copying the string "Apple" to the str1
   strcpy(str1, "Apple");
   printf("String str1: %s\n", str1);

   //copying the string "Banana" to the str2
   strcpy(str2, "Banana");
   printf("String str2: %s\n", str2);

   //copying the value of str2 to the string str1
   strcpy(str1, str2); 
   printf("String str1: %s\n", str1);

   return 0;
}

String str1: Apple
String str2: Banana
String str1: Banana

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

int main () {
   char str[20];

   /* copying the string "Apple" to the str and
    * displaying the return value of strcpy()
    */
   printf("Return value of function: %s\n", strcpy(str, "Apple"));
   printf("String str1: %s\n", str);

   return 0;
}

Return value of function: Apple
String str1: Apple