Work with values and variables

Work with values and variables

1. Variables

   • For the programmer a variable is something to refer a value throughout your program.
   • The computer makes reserves some storage to save the variable and make it available when you want to use it.
   • When a programmer needs to store value a variable is used, sometimes the programmer can enter what type of data is the variable

2. Numbers

   • In prgoramming languages exist several different types of numbers, depending on the result you want to have
     • Integer numbers are a complete number without any decimal.
       • There exist two different integer numbers
         • signed
           • A signed number is a number that can be either positive 0 or even negative
         • Unsigned
           • A unsigned number only is 0 or a positive number
   • Decimals
     • A decimal number is a fraction of a number E.G. .58

3. When you have numeric values you can add, subtract, multiply, and divide

   • But sometimes this change due to teh language for example if you want to divide an intiger the result just are going to be integer numbers

4. String

   • A string are characters united to create a long sequence of letters
     • They are usually wrapped with quotation marks so the computer can identify what is program text and what is a string
     • You can combine strings together to create a concatenation string