Variables : Variable Declaration « Language « C Tutorial






  1. C Tutorial
  2. Language
  3. Variable Declaration
  1. You can store values in variables.
  2. Each variable is identified by a variable name.
  3. Each variable has a variable type.
  4. Variable names start with a letter or underscore (_), followed by any number of letters, digits, or underscores.
  5. Uppercase is different from lowercase, so the names sam, Sam, and SAM specify three different variables.
  6. The variables are defined at the begining of the block.

The following is an example of some variable names:

average            /* average of all grades */ 

    pi                 /* pi to 6 decimal places */    

    number_of_students /* number students in this class */

The following are not variable names:

3rd_        /* Begins with a number */ 

    all$        /* Contains a "$" */   

    the end     /* Contains a space */ 

    int         /* Reserved word */

Meaningful variable name:

entry_total /* total number of items in current entry */   

    all_total   /* total of all entries */








1.5.Variable Declaration
1.5.1.Variables
1.5.2.How to declare a variable
1.5.3.Using a variable to store value
1.5.4.Initialize int value in declaration
1.5.5.Meaningful variable name
1.5.6.Define three variables and use assignment operator to assign value
1.5.7.Use printf to output variable