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C language tutorial by W3schools

 What is variable?

  • A name given to a memory location 
  • Declared by writing type variable_name;
  • initialized and declared by type variable_name=value;
Data type in C language 
Basic data type=int, char, double, float
Derived data type=array, pointer, structure, union
Enumeration dara type=emum
Void data type=void
1 byte=8 bits

4GB RAM= 4*1024*MB=4*1024*1024    KB=4*1024*1024 *1024byte=(4*1024*1024 *1024)*4bits


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