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;
}