Whats the difference between x=++4 and x=+4 and x=4++

Question

just confused about the double operators

Answer 1

all of those are errors...
what you probably meant :
x++ increment x but returns the old value
++x increment x but returns the new value
x += 4 adds 4 to x (notice its +=, not =+ like you wrote)

Answer 2

just to make it clear : you cannot use ++ on constants, only on variables (and if we talk about c++ here , then these variables must never be const)

Answer 3

example:
cout << a[x++] ;
// print values indexed by x and increment x to next element of a

Answer 4

thank you :D

Answer 5

x++ increments but returns the old value, so what's the point of that? in the code does it use the incremented value?