C# Variables and Data Types

Which best describes a variable?

• Variables store program data while code runs
• Variables control memory space
• Variables are individual values in a database table
• Variables enable programmers to work with different input devices

Which of the following is false?

• Variable values can change while a program runs
• Variables make it possible to process almost any kind of data
• All variables use the same amount of memory
• Variables must be stored in a database or file if they are to be retained when the program ends

To use the value of a variable you need to know:

• The size of the memory used by its data type
• The source of the data being stored
• The physical address location in memory
• A name to reference the data 

Which of the following data types cannot store the number 47,255?

• decimal
• int
• string
• byte

In C# the syntax to declare a variable is:
  datatype variablename;
Which of the following C# declarations are invalid?

• byte userage;
• integer intScore; 
• string STR_NAME; 
• decimal DeCtuRn;

Which holds integers or real numbers with 28 digit precision? (128 bits)

• int
• decimal
• bool
• string

Which holds alphanumerics using a Unicode encoding? (size varies)

• bool
• int
• decimal
• string

Which holds whole numbers? (32 bits)

• string
• bool
• int
• decimal

Which holds true or false?
 (8 bits)

• bool
• int
• decimal
• string