variable - modifiable lvalue

[v4vijayakumar]

What is the difference between a variable and a modifiable lvalue?
TIA.

 

[websnarf]

What is the difference between a variable and a modifiable lvalue?

A variable is independent named storage. An lvalue is basically just
storage that can appear on the left side of an assignment. So in these
cases:

x.y = 3; /* struct { int y; } x; */
q = "Hello"; /* char * q[]; */
*(p + 3) = 7; /* int * p; */
*(f(3)) = 2; /* int * f(int); */

x.y, q, *(p+3) and *(f(3)) are all lvalues, but none are variables.
However, x, q and p are variables. f is a function, so there is no
variable at all involved there, nevertheless an assignment to an lvalue
does happen.