Programming for NOOBS : Season 1

Moving on to Address of C variable :

It is literally the address of variables stored in a memory location. Assume internal memory as a small city with numerous houses and buildings which represent nothing but Variables. Each building has its own unique house number and address. Same concept in the case of the C identifier address. 

We use a special character to print the address, &.

main()

{

 int x=69;

cout<<"address of variable x is:"<<&x;

return 0;

}

Invalid syntax: &&x. 

& = address of            so, &x  means the address of the variable x

  by that logic &&x = address of the address of variable x = address of ( address x).

but the address of x is a constant character and the address operator can't be used with constants..

NOTE: the code is written in C++. In c use %u in printf to print the address. 

• The range of an address is 0000 to FFFF in hexadecimal. 
• You as a programmer cannot decide where to store the variable in the memory, You cannot decide the address just like you can't choose where to be born. 
• No two variables have the same physical address. It's a no brainer. 

Operators in C

• AND                       &     output: 1 if both bits are 1
• OR                           |    output: 1  if only one value is high 
• NOT                        ~     output:  inverts the bits
• XOR                        ^     output: 1 only when two bits have different values  
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