Lesson 15 Source Code

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Lesson 15 Video

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Lesson 15: Increment and Decrement part 1

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Examples of incrementing and decrementing


The vale on the right of the assignment operator ("=") will ALWAYS be the new value of the variable that is on the left hand sign of the assignment operator. 

(Don't forget there can be only one variable on the left side of the assignment operator.
#include <iostream>
using namespace std;

int main()
{
 int rocks=5, coins=71;
 coins = rocks + 3;
 cout << coins;
 cin.get();
 return 0;
}


The same rules still apply... The vale on the right hand side of the assignment operator will be the new value of the left hand side
#include <iostream>
using namespace std;

int main()
{
 int rocks=5, coins=71;
 coins = coins + 3;
 cout << coins;
 cin.get();
 return 0;
}


Here is a larger example of how to apply the increment and decrement technique.
#include <iostream>
using namespace std;

int main()
{
 int rocks=5, coins=71;
 char choice = 'b';
 cout << "would you like to buy a rock for 1 coin? ";
 cin >> choice;
 if(choice == 'y')
 {
  coins = coins - 1;
  rocks = rocks + 1;
  cout << "Thankyou!";
 }
 else
 {
  cout << "Thats too bad";
 }
 cout << coins;
 system("pause");
 return 0;
}

Lesson 7 Source Code

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Lesson 7 Video

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Lesson 7: the float and double types

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Hit ctrl + A on the key board (the "ctrl + A" means hit Ctrl and A at the same time)
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Hit Ctrl + C (Nothing significantly happens that is visible) and now its copied to the clipboard and your ready to paste it anywhere 

you wish



Examples of the float types

The float type will display up to six significant figures
#include <iostream>
using namespace std;

int main()
{
 float weight = 2.2468481268548972;
 cout << weight;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 float weight = 295.2468481268548972;
 cout << weight;
 cin.get();
 return 0;
}


The value will be dislayed in scientific notation when necessary.
#include <iostream>
using namespace std;

int main()
{
 float weight = 548123846512354;
 cout << weight;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 float weight = .00000000054812358;
 cout << weight;
 cin.get();
 return 0;
}


The float type will display 20 million in scientific notation but the the int type will not.
#include <iostream>
using namespace std;

int main()
{
 float weight = 20000000;
 cout << weight;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 int weight = 20000000;
 cout << weight;
 cin.get();
 return 0;
}


float types do not store a lot of significant figures. Look at this code carefully. The last number printed to the screen should be 0.2 

but you will get 0.1875 when its compiled.
#include <iostream>
using namespace std;

int main()
{
 float weight = 300000.1;
 float z = 300000.1;
 float total = weight + z;
 cout << weight;
 cout << endl << total - 600000;
 cin.get();
 return 0;
}



Examples of the float types
A better version of the float type (recommended)

Now compile this code.. The correct result is displayed after changing the float types to double types.
#include <iostream>
using namespace std;

int main()
{
 double weight = 300000.1;
 double z = 300000.1;
 double total = weight + z;
 cout << weight;
 cout << endl << total - 600000;
 cin.get();
 return 0;
}

Lesson 6 Source Code

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Lesson 6 Video

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Lesson 6: Mathematical Operators

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Example of the mathematical operators

Here are examples on how to apply the the addition, subtraction and multiplication.
#include <iostream>
using namespace std;

int main()
{
	int apples = 30;
	int oranges = 40;

	cout << apples + oranges;

	cin.get();
	return 0;
}
 #include <iostream>
using namespace std;

int main()
{
 int apples = 30;
 int oranges = 40;

 cout << apples - oranges;

 cin.get();
 return 0;
}
 #include <iostream>
using namespace std;

int main()
{
 int apples = 30;
 int oranges = 40;

 cout << apples * oranges;

 cin.get();
 return 0;
}


The division operator outputs different results depending on the variable type.
#include <iostream>
using namespace std;

int main()
{
 int apples = 110;
 int oranges = 40;

 cout << apples / oranges;

 cin.get();
 return 0;
}

Although 110/40 is 2.75, because these were all integer types, the result will ignore the decimal values and will use 2 as the value.

The float type stores decimal values and can be used to approximate values. (There is a better type to use other than float in the next 

lesson)
#include <iostream>
using namespace std;

int main()
{
 float apples = 110;
 float oranges = 40;

 cout << apples / oranges;

 cin.get();
 return 0;
}


If you use arithmetic with an int type and a float type, the result will be of the type float.
#include <iostream>
using namespace std;

int main()
{
 float apples = 110;
 int oranges = 40;

 cout << apples / oranges;

 cin.get();
 return 0;
}


The mod ("%") operator is used for finding the remainder of a quotient. The mod operator can only be used for int types only.
#include <iostream>
using namespace std;

int main()
{
 int x = 7;
 int y = 3;

 cout << x%y;

 cin.get();
 return 0;
}


Here is an example on how to ask a second grader the quotient of two integer values.
#include <iostream>
using namespace std;

int main()
{
 int x = 129;
 int y = 5;

 cout << "The quotient is " << x/y << " with a remainder of " << x%y;

 cin.get();
 return 0;
}

Lesson 5 Source Code

There is no lesson 5 source code

List of videos 
Lesson 5 Video

Lesson 4 Source Code

List of videos 
Lesson 4 Video

To get the full benefit of the lesson, watch the video

Lesson 4: Variables part 2: Assigning variables

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you wish



A little more on Declaring and assigning variables


The main emphasis on this video is ONE AND ONLY ONE VARIABLE will go onthe left hand side of the assignment operator (=) while any other expression can go on the right hand side.The value on the right hand side will be the new value of the ONE varibale on the left hand side.
#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;
 cout << "There are " << fruit << " fruit" << endl;
 cin.get();
 return 0;
}

Variables can be re-assigned a different value throughout different points of the program.
#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 
 apples = 12;

 cout << "There are " << apples << " apples" << endl;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;

 apples = oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;
 cin.get();
 return 0;
}
In this example, apples and oranges will be equal to 29 because the value of the right hand side of the assignment operator

#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;

 oranges = apples;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;
 cin.get();
 return 0;
}
In this example, apples and oranges will be equal to 29 because the value of the right hand side of the assignment operator

Lesson 3 Source Code

List of videos 
Lesson 3 Video

To get the full benefit of the lesson, watch the video

Lesson 3: Variables part 1: Declaring variables

NOTE: for a fast copy, follow these steps in order:

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Declaring a couple of Integer type variables

#include <iostream>
using namespace std;

int main()
{
	int apples;
	apples=3;
	int oranges;
	oranges=5;
	cout << "There are " << oranges << " oranges";
	cout << endl;
	cout << "There are " << apples << " apples";
	cin.get();
	return 0;
}

Lesson 2 Source Code

List of videos 
Lesson 2 Video

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Lesson 2: The cout statement

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Basic use of the cout statement

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World";
	cout << endl;
	cout << "my name is iam4eversmart88";
	cin.get();
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World" << endl << "my name is iam4eversmart88";
	cin.get();
	return 0;
}



more examples of the same thing

The point of these examples is to show you that white space really doesn't matter too much about white space.

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World"
	<< endl 
 
	<<
	"my name is iam4eversmart88";

	cin.get();
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	cout 
	<< "Hello World"
	<< endl; 
 
	cout <<
	"my name is iam4eversmart88";

	cin.get();
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World"
	<< endl; cout <<
	"my name is iam4eversmart88";

	cin.get();
	return 0;
}