в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:30:15Z

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==A Demonstration of the Conditional Operator==

<source lang="cpp">#include <iostream>
using namespace std;
int main()
{
int x, y, z;
cout << "Enter two numbers.\n";
cout << "First: ";
cin >> x;
cout << "\nSecond: ";
cin >> y;
cout << "\n";
if (x > y)
z = x;
else
z = y;
cout << "After if test, z: " << z;
cout << "\n";
z = (x > y) ? x : y;
cout << "After conditional test, z: " << z;
cout << "\n";
return 0;
}</source>

==Need parentheses around the conditional expression.==

<source lang="cpp">#include <iostream>
using namespace std;
int main(){
int x, y;
cout << "Enter two integers: ";
cin >> x >> y;
cout << x << ( x == y ? " is" : " is not" )
<< " equal to " << y << endl;
return 0;
}</source>

==Use the ? operator to prevent a division by zero==

<source lang="cpp">#include <iostream>
using namespace std;
int div_zero();
int main()
{
int i = 1, j = 0, result;

// This statement prevents a divide by zero error.
result = j ? i : j;
cout << "Result: " << result;
return 0;
}</source>
<pre class=codeResult>Result: 0</pre>

==Using the conditional operator to select output==

<source lang="cpp">#include <iostream>
using std::cin;
using std::cout;
using std::endl;
int main() {
int mice = 1;
cout << "You have "
<< mice
<< (mice == 1 ? " mouse " : " mice ")
<< "in total."
<< endl;
return 0;
}</source>
<pre class=codeResult>You have 1 mouse in total.</pre>

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