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

int main()
{
   char src[40];
   char dest[100];

   memset(dest, '\0', sizeof(dest));
   strcpy(src, "This is gongshiku.com");
   strcpy(dest, src);

   printf("最终的目标字符串： %s\n", dest);

   return(0);
}

最终的目标字符串： This is gongshiku.com

#include <stdio.h>

int main()
{
    char s1[100], s2[100], i;

    printf("字符串 s1: ");
    scanf("%s",s1);

    for(i = 0; s1[i] != '\0'; ++i)
    {
        s2[i] = s1[i];
    }

    s2[i] = '\0';
    printf("字符串 s2: %s", s2);

    return 0;
}

字符串 s1: nowcoder
字符串 s2: nowcoder