Output of C Programs | Set 10

Predict the output of the below programs.

Difficulty Level: Rookie

Question 1

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#include<stdio.h>
int main() 
{
   typedef int i;
   i a = 0;    
   printf("%d", a);
   getchar();
   return 0;
}    

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Output: 0
There is no problem with the program. It simply creates a user defined type i and creates a variable a of type i.



Question 2

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#include<stdio.h>
int main() 
{
  typedef int *i;
  int j = 10;
  i *a = &j;    
  printf("%d", **a);
  getchar();
  return 0;
}    

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Output: Compiler Error -> Initialization with incompatible pointer type.
The line typedef int *i makes i as type int *. So, the declaration of a means a is pointer to a pointer. The Error message may be different on different compilers.



Question 3

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#include<stdio.h>
int main() 
{
  typedef static int *i;
  int j;
  i a = &j;    
  printf("%d", *a);
  getchar();
  return 0;
}    

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Output: Compiler Error -> Multiple Storage classes for a.
In C, typedef is considered as a storage class. The Error message may be different on different compilers.
Question 2

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#include<stdio.h>
int main() 
{
  typedef int *i;
  int j = 10;
  i a = &j;    
  printf("%d", *a);
  getchar();
  return 0;
}  

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Output:
10

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References:

http://www.itee.uq.edu.au/~comp2303/Leslie_C_ref/C/SYNTAX/typedef.html
http://publib.boulder.ibm.com/infocenter/macxhelp/v6v81/index.jsp?topic=/com.ibm.vacpp6m.doc/language/ref/clrc03sc03.htm
http://msdn.microsoft.com/en-us/library/4x7sfztk.aspx



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