strcpy源码

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/*** *char *strcpy(dst, src) - copy one string over another * *Purpose: *       Copies the string src into the spot specified by *       dest; assumes enough room. * *Entry: *       char * dst - string over which "src" is to be copied *       const char * src - string to be copied over "dst" * *Exit: *       The address of "dst" * *Exceptions: *******************************************************************************/   char * __cdecl strcpy(char * dst, const char * src) {         char * cp = dst;           while( *cp++ = *src++ )                 ;               /* Copy src over dst */           return( dst ); }

 

当src到达 '\0’时，*cp被赋值为'\0’，整个表达式的值即为'\0’，对应的ASC码值为0.

=>while退出