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Predict output of following program
#include <stdio.h>
int fun(int n)
{
    if (n == 4)
       return n;
    else return 2*fun(n+1);
}
int main()
{
   printf("%d ", fun(2));
   return 0;
}
  • a)
    4
  • b)
    8
  • c)
    16
  • d)
    Runtime Error
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Predict output of following program#include <stdio.h>int fun(int...
Fun(2) = 2 * Fun(3) and Fun(3) = 2 * Fun(4) ....(i)
Fun(4) = 4 ......(ii)
From equation (i) and (ii),
Fun(2) = 2 * 2 * Fun(4)
Fun(2) = 2 * 2 * 4
Fun(2) = 16. 
So, C is the correct answer
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