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Variables in C

S
Satveer Mann

Variables in C language are names that represent memory locations used to store and change data values during program execution. Variables must be named in a clear way and can consist of letters, digits, and underscores. They must begin with a letter and have a maximum length of 31 characters. Examples of valid variable names include "John" and "T_raise" while invalid names include "123" or names with spaces.

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Variables in C Language By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 1
Variable A data name that may be used to store a data value. Uses the primary storage area. Value vary during the execution time. May take different values at different times. Basically memory locations which are given names and referred in the program by variable names. Are used for identification for entering the information and data. Must be in a meaningful way to reflect its function and nature in the program. By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 2
Variable may consist of Letters Digits Underscore(_) By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 3
Examples of Variable Average height Total Counter_1 Class_strength distance By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 4
Rules for defining a variable Must begin with a letter Some systems permit underscore as a first character. Length can be maximum up to 31 characters. Uppercase and lowercase letters are significant. White space is not allowed. By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 5
Examples of valid and invalid variable names: John mark x1 T_raise ph_value Valid 123 % (area) 25th Invalid By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 6
ThankYou By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 7

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Variables in C

  • 1. Variables in C Language By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 1
  • 2. Variable A data name that may be used to store a data value. Uses the primary storage area. Value vary during the execution time. May take different values at different times. Basically memory locations which are given names and referred in the program by variable names. Are used for identification for entering the information and data. Must be in a meaningful way to reflect its function and nature in the program. By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 2
  • 3. Variable may consist of Letters Digits Underscore(_) By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 3
  • 5. Rules for defining a variable Must begin with a letter Some systems permit underscore as a first character. Length can be maximum up to 31 characters. Uppercase and lowercase letters are significant. White space is not allowed. By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 5
  • 6. Examples of valid and invalid variable names: John mark x1 T_raise ph_value Valid 123 % (area) 25th Invalid By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 6
  • 7. ThankYou By: Satveer Kaur, Assistant Professor, Khalsa College, Patiala. 7