Ctrcmp strcpy source code

// System function source code int __cdecl strcmp ( const char *
src, const char * dst ) {          int ret = 0 ;             while ( ! (ret = *(unsigned char *)src
- *(unsigned char *)dst) && *dst) // Exit when the SRC and DST values are not equal and the DST value is not \ 0                  ++src, ++dst;             if ( ret < 0 )                  ret = -1 ;          else  if (
ret > 0 )                  ret = 1 ;          return ( ret ); }    char * strcpy(char * desStr,const char * srcStr) {       assert((desStr!=null)&&(srcStr!=null));        if(desStr==srcStr)   return desStr;         char * addres = desStr;         while(++(*desStr)=++(*srcStr));       return addres; } Note: Parameters are modified with Const. By using the const parameter, the parameter is a readable attribute and cannot be modified in the function body.   The pointer returned by the function, which can be assigned for chained operations. The assertion check checks whether the two parameters are null. If the two parameters are null, the following operations are not performed.