ABSTRACT
Chapter 2 described several rules. One of those rules was that each function can see only its own frame. This is called scope. A new scope is created every time a pair of { and } is used. This could be inside of a function body, for example, an if statement, or a while loop. The following example shows two scopes:
void f( int a, int b)1 {2
/* this is a scope , call it X */3
int i;4 for (i = 0; i < a + b; i ++)5
{6
/* this is another scope , call it Y */7
int j;8 }9
}10
i is a nested each other like this. Variables from outer scopes are still accessible, so scope Y can “see” a, b, and i. A local variable j is created inside of scope Y and is accessible only inside scope Y; scope X cannot “see” j.
