CC Code Learning Note 1

#define#defineINT32 int #define INT8 Char #define CHAR Char#defineSshort signed short #define INT16 signed short#define_assert_str (z) _assert_tmp (z)#define_assert_tmp (z) #z//into a stringThe __file__ in the C language is used to indicate the name of the source file in C language of the bank statement where the __line__ is used to indicate the position information of the line statement in the source file __func__, which indicates the function #line to reset the value of the __line__ typedef ssize_t (*ZMSS_READLINKP) (Const Char*,Char*, size_t); ssize_t is a type typedef qtss_error (*QTSS_CALLBACKPROCPTR) (...);//declaring function pointer typestypedef qtss_error (*QTSS_CALLBACKPROCPTR) (...);//declaring a function pointer type, its type variable can be the function name is the function address, any parameter qtss_error return type. Strcpy#include<iostream>#include<stdlib.h>using namespacestd;voidMain () {intA =3;intb =4;intc = (b=a); cout<<"C:"<< c<<endl;//returns the assigned value 3System"Pause");}Char* STRCPY (Char* DES,Const Char*source) {Char* r=des; Assert (des! = NULL) && (Source! =NULL));  while((*des++ = *source++)! =' /'); returnR;} /*While ((*des++=*source++)); Explanation: The assignment expression returns the left operand, so after the assignment of NULL, the loop stops*/  while(*des++=*source++), equivalent to while(1){    *des = *source; if(*source = =' /') Break; SOURCE++; Des++;} strcat stitching function//Add the source string to const, indicating that it is an input parameterChar* STRCAT (Char* Strdest,Const Char*s Trsrc) {    //after the return address, it cannot be placed after the assert assertion to declare the address    Char* address=strdest; Assert ((strdest!=null) && (strsrc!=null));//add a non-0 assertion to the source address and destination address     while(*strdest)//is a simplified form of while (*strdest!= ')    {        //If you use while (*strdest++), an error occurs because strdest also executes once + + at the end of the loop,//then strdest will point to the next position of '/'. /So be in the loop body + +; Because to make *strdest last point//to the end of the string "\". strdest++; }      while(*strdest++=*strsrc++) {NULL;//the cycle condition can be used in + +,}//Here you can add statements *strdest= ' + '; no need    returnAddress//To implement chained operations, return the destination address}   Char*mystrcat (Char*DST,Const Char*SRC)//implement strcat functions in your own way   {       Char*P=DST;//the following action will change the destination pointer to point to, first define a pointer to record the DST        while(*dst!=' /') dst++;  while(*src!=' /') *dst++=*src++; *dst=' /'; returnP//DST now points to the last character after stitching, where it returns DST and an error occurs  } voidDelete () {if(Ptr! =NULL) Delete [] Ptr; Ptr=NULL; Len=0; }Char*Ptr;CharLastsourcechar = Ptr[len-1];stringStrreadbuf ("");

CC Code Learning Note 1