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Static vs Dynamic Scope

Static vs Dynamic Scope. Mark Boady. Scopes. Static Scope Determine Variable Scope at compile time Dynamic Scope Determine Variable Scope at run time Static Scope is most likely what you are used to. Example 1. i nt x; i nt main(){ x=2; f(); g(); h(); } Void f() { int x=3; h();}

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Static vs Dynamic Scope

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  1. Static vs Dynamic Scope Mark Boady

  2. Scopes • Static Scope • Determine Variable Scope at compile time • Dynamic Scope • Determine Variable Scope at run time • Static Scope is most likely what you are used to

  3. Example 1 int x; int main(){ x=2; f(); g(); h(); } Void f() { int x=3; h();} Void g() { int x=4; h();} Void h() { printf(“%d ”,x);} Static Prints out: 2 2 2 Dynamic Prints out: 3 4 2

  4. Example 2 Intm,n; Void hardy(){ printf(“in hardy n =%d”,n); } Void laurel(int n){ printf(“in laurel m=%d\n”,m); printf(“in laurel n=%d\n”,n); Hardy(); } Int main(){ m=50; n=100; printf(“In Main n=%d”,n); Laurel(1); hardy(); }

  5. Example 2 Static Answer • in main program -- n = 100 • in laurel -- m = 50 • in laurel -- n = 1 • in hardy -- n = 100 • in hardy -- n = 100

  6. Example 2 Dynamic Answer • in main program -- n = 100 • in laurel -- m = 50 • in laurel -- n = 1 • in hardy -- n = 1 • in hardy -- n = 100

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