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2010-05-25T14:21:17Z

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==Demonstrates built-in arithmetic operators==

<source lang="cpp">#include <iostream>
using namespace std;
int main()
{
cout << "7 + 3 = " << 7 + 3 << endl;
cout << "7 - 3 = " << 7 - 3 << endl;
cout << "7 * 3 = " << 7 * 3 << endl;
cout << "7 / 3 = " << 7 / 3 << endl;
cout << "7.0 / 3.0 = " << 7.0 / 3.0 << endl;
cout << "7 % 3 = " << 7 % 3 << endl;
cout << "7 + 3 * 5 = " << 7 + 3 * 5 << endl;
cout << "(7 + 3) * 5 = " << (7 + 3) * 5 << endl;
return 0;
}</source>

==Demonstrating operators .* and ->*.==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
class MyClass
{
public:
void myFunction()
{
cout << "In myFunction function\n";
}
int value;
};
void f( MyClass * );
void f2( MyClass * );
int main()
{
MyClass myFunction;
myFunction.value = 8;
f( &myFunction );
f2( &myFunction );
return 0;
}
void f( MyClass *myFunctionPtr )
{
void ( MyClass::*memPtr )() = &MyClass::myFunction;
( myFunctionPtr->*memPtr )();
}
void f2( MyClass *myFunctionPtr2 )
{
int MyClass::*vPtr = &MyClass::value;
cout << ( *myFunctionPtr2 ).*vPtr << endl;
}</source>
<pre class=codeResult>In myFunction function
8</pre>

==Precedence of C Operators==

<source lang="cpp">Highest ( ) [ ] - >
! ~ ++ -- - (type) * & sizeof
* / %
+ -
<< >>
< <= > >=
== !=
&
^
|
&&
||
?
= += -= *= /=
Lowest ,</source>

==Using the & and * operators==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
int main()
{
int a;
int *aPtr;
a = 7;
aPtr = &a;
cout << "The address of a is " << &a << "\nThe value of aPtr is " << aPtr;
cout << "\n\nThe value of a is " << a << "\nThe value of *aPtr is " << *aPtr;
cout << "\n\nShowing that * and & are inverses of " << "each other.\n&*aPtr = " << &*aPtr
<< "\n*&aPtr = " << *&aPtr << endl;
return 0;
}</source>
<pre class=codeResult>The address of a is 0x22ff74
The value of aPtr is 0x22ff74
The value of a is 7
The value of *aPtr is 7
Showing that * and & are inverses of each other.
&*aPtr = 0x22ff74
*&aPtr = 0x22ff74</pre>

==Using the unary scope resolution operator==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
int n = 7;
int main()
{
double n = 10.5;
cout << "Local double value of n = " << n
<< "\nGlobal int value of n = " << ::n << endl;
return 0;
}</source>
<pre class=codeResult>Local double value of n = 10.5
Global int value of n = 7</pre>

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в 14:21, 25 мая 2010

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