C++ Operators w\ Variables

C++ Operators w\ Variables

by Michael Ask

Multiple Choice

Which of these characters is used for multiplication?

• +

• -

• *

• /

• x

​Operating on Variables

​The most important operations will be done on variables, in C++. Frequently you will want to add two variables together, or subtract something from one of them, or multiply two together.

​It might look something like this...

​

​int x = 3;

​int y = 4;

​cout << x + y;

Multiple Choice

What is the output of this code?

int c = 4;

int d = 2;

cout << c*d;

• 6

• 2

• 8

• 16

Lots of variables

​Maybe you have a need for more than one variable. It happens! Maybe like this...

​

​int l = 4;

​int w = 2;

​int h = 3;

​cout << "The volume is " << l*w*h;

​

​What is the purpose of this code?

Multiple Choice

What does this code output?

int g = 2;

int h = 2;

int j = 3;

cout << (g + j) * h;

• 10

• 8

• 12

• 6

Multiple Choice

What does this code output?

int r = 2;

int s = 3;

int t = 5;

cout << r + s * t;

• 11

• 17

• 25

• 10

​Changing variables

​Look at this code...

​​int x = 3;

​

​What if we want to change it to a 6? We can do this...

​

​x = 6;

​

​OR

​

​x = x * 2;

Multiple Choice

What is the output of this code?

int x = 5;

x = 3;

cout << x;

• 3

• 5

• 15

• 2

Multiple Choice

What is the output of this code?

int x = 3;

x = x + 2;

cout << x;

• 5

• 2

• 3

• 1

Multiple Choice

What is the output of this code?

int x = 4;

int y = 2;

y = x * y;

cout << y;

• 8

• 16

• 2

• 4

Multiple Choice

What is the output of this code?

int x = 2;

int y = 6;

y = y / 2;

x = x + y;

cout << x;

• 5

• 6

• 2

• 3