в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:30:19Z

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==An improved Help system that uses a do-while to process a menu selection==

<source lang="cpp">#include <iostream>
using namespace std;

int main() {
char choice;

do {
cout << "Help on:\n";
cout << " 1. if\n";
cout << " 2. switch\n";
cout << " 3. for\n";
cout << " 4. while\n";
cout << " 5. do-while\n";
cout << "Choose one: ";

cin >> choice;

} while( choice < "1" || choice > "5");

cout << "\n\n";

switch(choice) {
case "1":
cout << "The if:\n\n";
break;
case "2":
cout << "The switch:\n\n";
break;
case "3":
cout << "The for:\n\n";
break;
case "4":
cout << "The while:\n\n";
break;
case "5":
cout << "The do-while:\n\n";
break;
}
return 0;
}</source>
<pre class=codeResult>Help on:
1. if
2. switch
3. for
4. while
5. do-while
Choose one: 2

The switch:</pre>

==do while loop with int counter==

<source lang="cpp">#include <iostream>

int main()
{
int counter;
std::cout << "How many hellos? ";
std::cin >> counter;
do
{
std::cout << "Hello\n";
counter--;
} while (counter >0 );
std::cout << "counter is: " << counter << std::endl;
return 0;
}</source>
<pre class=codeResult>How many hellos? 5
Hello
Hello
Hello
Hello
Hello
counter is: 0</pre>

==Nested if statement in a do while loop==

<source lang="cpp">#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
int magic;
int guess;

magic = rand(); // get a random number

do {
cout << "Enter your guess: ";
cin >> guess;
if(guess == magic) {
cout << "Right";
cout << magic << " is the magic number.\n";
}
else {
cout << "...Sorry, you"re wrong.";
if(guess > magic)
cout << " Your guess is too high.\n";
else cout << " Your guess is too low.\n";
}
} while(guess != magic);

return 0;
}</source>
<pre class=codeResult>Enter your guess: 3
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 2
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 3
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 4
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 7
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 8
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 12
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 30
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 500
...Sorry, you"re wrong. Your guess is too high.
Enter your guess: 250
...Sorry, you"re wrong. Your guess is too high.
Enter your guess: 125
...Sorry, you"re wrong. Your guess is too high.
Enter your guess: 60
...Sorry, you"re wrong. Your guess is too high.
Enter your guess: 30
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 45
...Sorry, you"re wrong. Your guess is too high.
Enter your guess: 40
...Sorry, you"re wrong. Your guess is too low.
Enter your guess: 43
...Sorry, you"re wrong. Your guess is too high.
Enter your guess: 42
...Sorry, you"re wrong. Your guess is too high.
Enter your guess: 41
Right41 is the magic number.</pre>

==Use do while loop to read a number==

<source lang="cpp">#include <iostream>
using namespace std;

int main()
{
int num;

do {
cout << "Enter a number (100 to stop): ";
cin >> num;
} while(num != 100);

return 0;
}</source>
<pre class=codeResult>Enter a number (100 to stop): 1
Enter a number (100 to stop): 2
Enter a number (100 to stop): 3
Enter a number (100 to stop): 100</pre>

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в 14:21, 25 мая 2010

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