Bitwise Operators - C Programming Questions and Answers

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Which of the following statements are correct about the program?

 #include
 char *fun(unsigned int num, int base); 
 int main()
 {   
      char *s;    
      s=fun(128, 2);   
      s=fun(128, 16);      
      printf("%s\n",s);  
      return 0; 
}
 char *fun(unsigned int num, int base) {     
    static char buff[33];   
    char *ptr = &buff[sizeof(buff)-1];     
    *ptr = '\0';  
    do   
    {      
        *--ptr = "0123456789abcdef"
        [num ºse];    
       num /=base;   
   }while(num!=0); 
   return ptr;
 }