3. in the processor area you might also find prototypes. such as: void ouch ();

Question

3. in the processor area you might also find prototypes. such as:

void ouch ();

void ouch (int b, short e);

a) explain why prototypes are necessary and what they do.

b) explain what each of the commands above do.

2b. Explain what each of the commands above do (5 pts/command) 3. in the processor area you might also find prototypes. such as: void ouch (); void ouch (int b, short e); a) explain why prototypes are necessary and what they do. b) explain what each of the commands above do. 2. Given the following preprocessor area commands: 2a. Explain what preprocessor area is intended to do (10 pts)

Explanation / Answer

1. # include "stdafx.h" :

Advantages :

2. # include <iostream.h>

3. using namespace std :

Ex:

Ex:

Output :

Ex: using namespace std;

cout<<"HI";

Ex: std::cout<<"HI";

  #include <iostream>  using namespace std;    namespace a  {    int x = 1;    int y = 12;  }    namespace b  {    double x = 3.1416;    double y = 2.7183;  }    int main () {    cout <<a::x << ' ';    cout << a::y << ' ';    cout << a::y << ' ';    cout << second::x << ' ';    return 0;  }  

Output :

  2  12  3.1416  2.7183  

• All the variables, constants, and functions of the standard C++ Library are declared within the std namespace.

Ex: using namespace std;

cout<<"HI";

• If we did not declared the std namespace, we need to define every time when we need to initialize the function.

Ex: std::cout<<"HI";

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