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19/07/07 - 398 Views - No Ratings Yet

Level - Advance
      

Question -

Output of the following code will be?

#include <stdio.h>

void e(int );      

int main( ) 
 {   
     int a;    
     a=3;    
    e(a); 
   return 0;
 }    

void e(int n)  
{    
   if(n>0)   
      {     
         e(--n);      
         printf("%d" , n);      
         e(--n);   
       }  
}  

Answer -

 0120

Explanation -

This is the most difficult breed of output questions, recursion outputs. To find an ouput in recursion questions of c you need to trace every step in detail as following figure does in this question.

This figure adequately explain the reason of output of c source code in this question.

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