this is my quiz Iam taking now need quick answers

this is my quiz Iam taking now need quick answers thanks

Question 1

1. Unions…
   

   	permit different memory spaces to hold the same value
   	permit the same memory space to hold different types
   	permit different memory spaces to hold the same type
   	permit the same memory space to hold different values simultaneously

10 points

Question 2

1. #define COMBINE(x,y,z) ((x)>(z)?(y+x):(y-x))

   What is the output of the following statement:

   printf(“%d”,COMBINE(4,6,1));

   	2
   	-2
   	5
   	10

10 points (Extra Credit)

Question 3

1. What is the purpose of enumeration
   

   	Define meaningful names for integer values
   	Express real numbers with distinct name
   	Assign unique names to variables
   	Associate integer values with unqiue variables

10 points

Question 4

1. #define MAX(x,y) ((x)>(y)?(x):(y))

   This is an example of…

   	Switch macro
   	Basic macro
   	Conditional macro
   	Parametrized macro

10 points

Question 5

1. Preprocessor directives always begin with…
   

   	~
   	*
   	#
   	%

10 points

Question 6

1. With preprocessor directives the preprocessor…
   

   	acts on the directives during compilation
   	acts on the directives and removes the lines before compilation
   	acts on the directives in place of compilation
   	acts on the directives after compilation

15 points

Question 7

1. What is the output of the following code

   union

   {

   int di;

   double dd;

   } my_uid;

   int main()

   {

   my_uid.di = 52;

   my_uid.dd = 12.98;

   printf (“%dn”, my_uid.di);

   return 0;

   }

   	12.98
   	-1889785610
   	The output is unpredictable
   	52

10 points

Question 8

1. What is the output of the following code

   typedef enum

   {

   red = 2,

   blue = 4,

   green,

   yellow = 8

   } color_t;

   int main ( void )

   {

   color_t cur_color = green;

   printf (“%dn”, cur_color);

   return 0;

   }

   	5
   	7
   	0
   	unknown (could be any integer)

15 points

Question 9

1. Why is it a good idea to use structs with unions
   

   	To help indicate the current type of the stored data
   	To provide a mechanism for changing the content of the union
   	To prevent buffer overflows
   	To ensure that syntax errors do not ocurr

10 points

Question 10

1. Enumerations are always…

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