static and dynamic scoping

Question

int a=0,b=0;

int main(void)

{
    int a=3;
    printf("%d%d",a,b);
    c();
    printf("%d%d",a,b);
    return 0;
}
void c()
{
    printf("%d%d",a,b);
    a=4,b=5;
    printf("%d%d",a,b);
    d();
    printf("%d%d",a,b);
    
}
void d()
{
    int b=6;
    e(a,b);
    printf("%d%d",a,b);
    
}
void e(int b,int a)
{
    printf(a,b);
    a=7;b=8;
    printf("%d%d",a,b);
}

 

Comments

Static-

3,0,0,0,4,5,6,4,7,8,4,6,4,5,3,5,6,4,7,8,4,6

Dynamic-

3,0,3,0,4,5,6,4,7,8,4,6,4,5,4,5,6,4,7,8,4,6

Answer 1

A. Static scoping (if variable not found go for global variable)
3 0 (main's local a and global b)
0 0 (global a and global b)
4 5 (global a and global b)
6 4 (e()'s local a,b)
7 8 (e()'s local a,b)
4 6 (global a and d()'s local b)
4 5 (global a and global b)
3 5 (main's local a and global b)

B. Dynamic scoping (if variable not found look in caller function for variable)
3 0 (main's local a and global b)
3 0 (main's local a and global b)
4 5 (main's local a and global b)(main's local a is updated, global a is still 0 and global b=5)
6 4 (e()'s local a and b)
7 8 (e()'s local a=7 and local b=8)
4 6 (main's local a and d()'s local b)
4 5 (main's local a and global b)
4 5 (main's local a and global b)

Comments

ok, where int a, or int b taking value there memory exists and there global variable will not update and where int not exist and a,b only assigning a value, there global variable updated

like in c() global variable will update but in main() global variable will not update.

correct me if wrong

---

@srestha not getting your query. In both scoping, an assignment will only modify one memory location. Our problem is to identify which location it is.

---

Ty sir, best instance to get scoping