Question

Question 1

1. Given the declarations:
   #include <stdio.h>
   
   struct STRUCTURE
   {
   int aa;
   char bb[20];
   }
   enum Numbers
   {
   zero, one, two, three
   }
   typedef struct STRUCTURE STR;
   typedef enum Numbers NB;
   
   STR st1, st2;
   NB value1, value2;
   
   check the validity of the following assignments:

A) Valid B) Not valid

value1 = four;

value2 = three;

printf (“st1= %d”, st1);

st2.aa = two;

strcpy(st2.bb,"Quiz4");

Answer 1

Question 1:
Given the declarations:
#include <stdio.h>
struct STRUCTURE
{
int aa;
char bb[20];
}
enum Numbers
{
zero, one, two, three
}
typedef struct STRUCTURE STR;
typedef enum Numbers NB;

STR st1, st2;
NB value1, value2;
check the validity of the following assignments:

1. value1=four
Ans: Invalid.
This is invalid because value1 is of type enum Numbers so accept enum values only. In the enum declaration, we have defined only zero, one, two, and three only but not four. This will raise an error saying four undeclared.

2. value1=three
Ans: Valid
This is Valid because as mentioned three is present in the enum structure so which will not raise an error.

3. printf ("st1= %d", st1);
Ans: Invalid
This will execute but still raises a warning. This is because st1 is a variable of type STRUCTURE which contains an int as well as the char array. Directly using st1 which is a variable of type structure. So this will print some garbage address.

4.st2.aa = two;
Ans: Valid
This is valid because st2 is a variable of type STRUCTURE and the member aa represents int and now we use two which holds the value 2(because as it as of enum type zero holds 0, one holds 1, likewise). This is a valid assignment and holds an int value.

5. strcpy(st2.bb,"Quiz4");
Ans: Valid
This is valid because st2 is a variable of type STRUCTURE and the member bb represents a char array and we are passing a string "Quiz4" which is also of type char array only.so this will execute perfectly.

Please check the compiled program and its output for your reference:

main.c 1 #include <stdio.h> 2 #include<string.h> 3 struct STRUCTURE 4-{ 5 int aa; 6 char bb[20]; 7 }; 8 enum Numbers 9 { 10 zero, one, two, three 11 }; 12 typedef struct STRUCTURE STR; 13 typedef enum Numbers NB; 14 15 STR st1, st2; 16 NB valuel, value2; 17 int main() 18 { 19 printf("Question 1"); 20 //valuel = four; 21 22 value2 three; 23 24 //printf ("st1= %d", st1); 25 26 st2.aa = two; 27 28 strcpy(st2.bb, "Quiz4"); 29 30 return 0; 31 } 32

Output:
As you can see commenting out makes the program run without any errors.

Question 1 ... Program finished with exit code 0 Press ENTER to exit console.

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