-
Notifications
You must be signed in to change notification settings - Fork 0
/
15_constants.cpp
28 lines (23 loc) · 1.09 KB
/
15_constants.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
# include <iostream>
using namespace std;
int main()
{
const int N = 100; // A const variable must be initilised at the time of definition
int m; // some garbage value in here
int *p;
p = &m; // p holds the address of m.
*p = 0; // But now m holds 0 as it's value. Becuse p is pointing towrds m
cout <<"The value of m is "<< m << endl;
*p = 200;
cout<<"Now the value of m is "<< m << endl;
// p = &N; A variable cannot hold the address of a const type.
// *p = 800; Value of a const type cannot be changed
return 0;
}
// Don't use macros or Manifest constants from now on, because
// Using #define | Using const
//--------------------------------------------------------------------------
/** Is not type safe | * Has its type
* Replaced textually by CPP | * Visible to the compiler
* Cannot be watched in debugger | * Can be watched in debugger
* Evaluated as many times as replaced | * Evaluated only on initialization */