C transition to C + +

1, in C + +, a program through the g++ compiler of four steps:

pretreatment g++ Tect.cpp-o test.i-e

Compiling g++ test.i-o test.s-s

Compilation g++ Test.s-o test.o-c

Link g++ test.o-o Test

Execute statement after:./test

2, C and C + + relations:

Learning any new language must think about what has been learned, find similarities and differences, and facilitate learning the characteristics of a new language.

C + + meaning: Plus Plus

C + + is fully compatible with the C language, and many of these features can be reflected.

C:. C stdio.h printf The scanf function is not overloaded, and the struct cannot be an empty procedure

C + +:. cpp iostream (Introduction namespace) cout Cin has overloads, and the class can be empty to emphasize an object

C Program:

#include <stdio.h> void main (void) {int i = 10; printf ("i =%d\n", i);}

C + + programs:

#include <iostream>using namespace Std;int main (void) {int i = 10; Cout<<i<<endl;}

The output of C + + does not emphasize the format of the output, which is automatically recognized by the compiler to Endl carriage return to newline.

Simple differences between 3, C, and C + +:

(1), the created file type is different, C language is. C, C + + is. cpp

(2), the introduction of the header file is not the same

(3), C + + has a namespace

(4), input and output statements are not the same

(5), C language does not allow overloading, C + + can be overloaded

(6), the custom type is different, the C language uses the struct,c++ to use the class

(7), C + + language has logical data type bool

4, C, and C + + compilation Recognition:

The C-language variable must be placed before all valid statements.

When the C + + language uses the variable, in the definition, the comparison conforms to the human culture.

5, C and C + + programming Ideas:

C function + Algorithmic programming emphasizes the process of implementation .

C + + because it is fully compatible with C, its definition variables are not like Java, all objects, int i; this is just a normal variable, so C + + is an object-oriented language.

Object + Object +.................+ algorithm

Talk about C + + Everything to use the object programming emphasizes the object of what, everything around the object

6, in C + + for a number of identical functions of the simple identification method:

(1), using the condition macro

#define Aaa#ifdef AAA void Fun () {} #else void Fun () {} #endif

(2), the use of namespaces to solve:

#include <iostream>using namespace std;namespace myspace{void Fun () {cout<< ' this MySpace ' <<    ; Endl;    }};namespace youspace{void Fun () {cout<< ' this youspace ' <<endl;    }};using namespace Myspace;int main (void) {fun (); return 0;}

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This is the same call problem that solves the function through the namespace, and of course, the nature and usage of the namespace is not very clear to me when I first touch C + +.

C transition to C + +