01  #include<stdio.h>
02 
03  int main()
04  {
05  
06  int a=10;
07  float f=3.3;
08  
09  void *ptr; // generic pointer
10  
11  ptr=&a; // pointer points to integer variable
12  
13  printf("Value of a : %d nn",a);
14  
15  ptr=&f; // pointer points to float variable
16  
17  printf("Value of f : %.2f nn",f);
18  
19  return 0;
20  }

 OUTPUT :
 
 Value of a : 10
 
 Value of f : 3.30