#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;
}Help on:
1. if
2. switch
3. for
4. while
5. do-while
Choose one: 2
The switch:
do while loop with int counter
#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;
}How many hellos? 5
Hello
Hello
Hello
Hello
Hello
counter is: 0
Nested if statement in a do while loop
#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;
}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.
Use do while loop to read a number
#include <iostream>
using namespace std;
int main()
{
int num;
do {
cout << "Enter a number (100 to stop): ";
cin >> num;
} while(num != 100);
return 0;
}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
