Variable Scope and Life Time

Variable Scope :

• The region in which a variable is valid.
• Variables declared outside of a function have global scope 

Variable Redefinitions:

• You could re-declare any variable in your outer scope but you couldn't declare 2 variables with the same name in the same scope 

Example 1 : 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

#include <stdio.h> int nmax=20; int main ( ){ int a=0 , b=1 , c , n ; printf("%d: %d\n",1,a); printf("%d: %d\n",2,b); int nmax=10; for (n=3 ; n<=nmax ; n++) { c=a+b; a=b; b=c; printf("%3d : %d\n",n,c); } return 0 ; }

;

Output :  1:  0       2:  1
       3 : 1
       4 : 2
       5 : 3
       6 : 5
       7 : 8
       8 : 13
       9 : 21
       10 : 34

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