de-referencing of operator, Pointer to a variable.

C Programming Language Operators and Enums in C Language (Article) Operators and Enums in C Language (Program)

810

Program:

value of a is  12
*ptr is 12
Press any key to continue . . .

Output:

value of a is  4
*ptr is 4
Press any key to continue . . .

This Particular section is dedicated to Programs only. If you want learn more about C Programming Language. Then you can visit below links to get more depth on this subject.