how can r in the below programme print 1??
let me explain this program line by line...
1) int x = 4; -> Declaring an integer X and giving it a value 4. now the X has an address(not known to us) and a value (which is 4)
2) int *p = &x; -> Creating a pointer variable P , and make it pointing at the address of X . now *p equals to 4. where P equals to whatever the address of X.
3) int *k = p++ ; -> creating a pointer variable K, make it equals to P++. here P++ is , pointer moves to next int position. so the value of K is four address higher than P. and value of *K is four higher than P. (ref image. the image says that the computer always creates four addresses for an declared int by default )
this is the reason for that 4 value fluctuation. not the value of X as four. be clear about that.
4) int r = p - k; -> integer R is declared. assigned the value as difference of addresses of P & K. which is actually 4 . but the computer consider it as 1. the reason for this is Since both are of same data types, the difference will always be 1 because it is literally the next address for the computer.
so by collecting the above operations, the print f should give the values as,
r -> 1
p -> address of r.
k -> next address to p (4 added/subtracted to the address of p. for eg. addrs of p = 100. then k here should print 104/96)
ps: (i have been learning my first programming language just now only. am also a noob . so correct me if i am wrong. i just found ur questn really interesting. so i did some research around and wrote this)
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