Concept of SCOPE OF VARIABLES in C

Concept of SCOPE OF VARIABLES in C

#include 
main()
{    
   int i = 10; 

   {      
       int i = 0;       
       for( i=0;i<2;i++)         
{               
printf("value of i is %d\n",i);        
}         
}    
printf("the value of i is %d\n",i);   }    

Explanation :

• The statement block 1 defines the start of block 1.
• The statement ‘end of block 1’ defines the end of block 1.
• Statement A defines variable i which has the scope in the entire block 1.
• The statement block 2 defines the start of block 2.
• The statement ‘end of block 2’ defines the end of block 2.
• Statement B defines variable i which is entirely in block 2.
• The for loop refers i, which can be resolved using two definitions: statement A and statement B.
• Since the definition of statement B is nearest, the variable is referred using that definition, so the for loop modifies the value of i at statement B.
• Variable i at statement A and variable i at statement B are two independent variables even though they have the same name. Statement D is outside block 2, so it prints the value of variable i in block 1.