Static Scope and Dynamic Structure

Static scoping decides the declaration of a name by examining the program text only. Pascal and C are few languages that use static scoping. 

The blocks in the program help to find out the scope of a variable. 

Example:

void main()
{
 int x=1, y=2, sum;
 {
 Int x=2,add;
 {
 add=y+b;
 } //Block A
 sum= x+y;
 } //Block B
} //Block C

In the above example program. The scope of the variable ‘add’ is only until Block A, the scope of variable ‘sum’ is in Block B and the scope of variables x and y are in Block C.

We also see that the value of x varies in two different blocks. Here, the scope of x with value 2 is only in block A, whereas, the scope of x with value 1 is global, or scope is in block C.

Reference Link

Static Scope and Dynamic Structure