Linux/C + + differences: type declaration, struct

C has arrays, structs, pointers, functions, macros

C + + has namespaces, references, default parameters, templates, function overloads, custom operators, inline, construct/destructor, private/protected Members, friends, exceptions.

I. Declaration of data types

1. C + + allows data declaration to appear anywhere in the program

C Code (Exception)

1#include <stdlib.h>2#include <stdio.h>3 4 intMainintargcChar*argv[])5 {6          for(intI=0; i<5; i++)7printf"Hello%d\n", i);8 9         return 0;Ten}

C + + code (normal)

1#include <iostream>2#include <cstdio>3 using namespacestd;4 5 intMainintargcChar*argv[])6 {7          for(intI=0; i<5; i++)8printf"Hello%d\n", i);9 Ten         return 0; One}

2. C + + allows entities to be defined using struct names

C Code (Exception)

1#include <stdlib.h>2#include <stdio.h>3#include <string.h>4 5 //You cannot define entities directly using struct names in C language6 struct Person7 {8         Charname[ -];9         intAge ;Ten }; One  A intMainintargcChar*argv[]) - { -         //struct person person; the person person ; -  -strcpy (Person.name,"Tom"); -Person.age =5; +  -printf"%s is%d\n", Person.name, person.age); +  A         return 0; at}

C + + code (normal)

1#include <iostream>2#include <cstdio>3#include <cstring>4 using namespacestd;5 6 //You can define entities directly using struct names in C + +7 struct Person8 {       9         Charname[ -];Ten         intAge ; One }; A  - intMainintargcChar*argv[]) - {        the         // - person person ; -          -strcpy (Person.name,"Tom"); +Person.age =5; -          +printf"%s is%d\n", Person.name, person.age); A          at         return 0; -}

Second, struct

1. C + + allows functions to manipulate data members within a struct as a struct member declaration.

C Code (Exception)

1#include <stdlib.h>2#include <stdio.h>3#include <string.h>4 5 //a function in C that does not allow manipulation of data members within a struct, as a struct member declaration6 struct Person7 {8         Charname[ -];9         intAge ;Ten  One         // A         voidOutput () {printf ("%s is%d\n", name, age); } - }; -  the intMainintargcChar*argv[]) - { -         structperson person ; -  +strcpy (Person.name,"Tom"); -Person.age =5; +  A person.output (); at  -         return 0; -}

C + + code (normal)

1#include <iostream>2#include <cstdio>3#include <cstring>4 using namespacestd;5 6 //a function in C + + that allows manipulation of data members within a struct as a struct member declaration7 struct Person8 {9         Charname[ -];Ten         intAge ; One  A         // -         voidOutput () {printf ("%s is%d\n", name, age); } - }; the  - intMainintargcChar*argv[]) - { -         // + person person ; -  +strcpy (Person.name,"Tom"); APerson.age =5; at  - person.output (); -  -         return 0; -}

Linux/C + + differences: type declaration, struct