程序代码：

#include<stdio.h>

char * __cdecl _strcpy(char * dst, char * src)
{
        char * cp = dst;
        char * t=src;
        while( *cp++ = *src++ ); 
        --cp;
        while( *cp++ = *t++ );             
        return( dst );
}

int main()
{
    char t[100]={'\0'};
    char s[]="twotwo";
    printf("%s\n",_strcpy(t,s));
    return 0;
}