[spoiler title=”Lesson Video”]
Direct Download of Video (For mobile / offline viewing)(right click > save target as)


[/spoiler]

[spoiler title=”Lesson Source Code”]

#include <iostream>
using namespace std;
 
 
int main(){
 
  /*
  *
  **
  ***
  ****
  ***
  **
  *
  */
  //Allow the user to determine the max size for the output
  //Counter starts and ends at 1
  //Each time the counter is increasing by 1
  //Each time, there is a second counter, counting to the value of the first counter
  //Once it hits it's maximum value, it counts down.
 
  int value = 0;
  cout << "Please enter a value: ";
  cin >> value;
 
  //Count up
  for (int i = 1; i <= value; i++){
    for (int j = 0; j < i; j++){
      cout << "*";
    }
    cout << endl;
  }
 
  //Count down
  for (int i = value-1; i >= 1; i--){
    for (int j = 0; j < i; j++){
      cout << "*";
    }
    cout << endl;
  }
 
 
  system("PAUSE");
  return 0;
}
  

[/spoiler]

Homework: http://beginnerscpp.com/forums/index.php/topic,63.0.html



Nested Loops
In this lesson I threw you guys straight into the deep end. The basic concept of nested loops is the same as a nested if statement, you have an inner loop that will complete all of it’s instructions every time through the outer loop (unless there is a break statement somewhere). Here’s an example:

for (int i=0; i<4; i++){
    for(int j=0; j<3; j++){
        cout << j;
    }
    cout << endl;
}

The code above will look like this when output:

012
012
012
012

As you can see in the example, the inner loop is running fully every time the outer loop iterates.