Lesson 16 Source Code

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Lesson 16 Video

Lesson 16: The while loop

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beginning while loop examples

This will print my name 5 times to the screen
#include <iostream>
using namespace std;

int main()
{
 int a=0;
 while(a<5)
 {
  cout << "iam4eversmart88" << endl;
  a = a + 1;
 }
 cin.get();
 return 0;
}


This program code will count from 0 to 24 
#include <iostream>
using namespace std;

int main()
{
 int a=0;
 while(a<25)
 {
  cout << a << endl;
  a = a + 1;
 }
 cin.get();
 return 0;
}


This program will NEVER END. This is a common bug called the infinite loop 
#include <iostream>
using namespace std;

int main()
{
 int a=0;
 while(a<=500)
 {
  cout << a << endl;
  a = 2*a;
 }
 cin.get();
 return 0;
}


This program will double the value of "a" and print it out to the screen until a is greater than 500
(NOTE: There is only 1 difference compared to the program above this one)
#include <iostream>
using namespace std;

int main()
{
 int a=1;
 while(a<=500)
 {
  cout << a << endl;
  a = 2*a;
 }
 cin.get();
 return 0;
}


This program will dived a by 2 each time until a is 0;
#include <iostream>
using namespace std;

int main()
{
 int a=1000000;
 while(a>0)
 {
  cout << a << endl;
  a = a/2;
 }
 cin.get();
 return 0;
}