Structures, Unions, Enums problems
- 1. What will be the output of the program?
#include<stdio.h> int main() { struct byte { int one:1; }; struct byte var = {1}; printf("%d\n", var.one); return 0; }
Options- A. 1
- B. -1
- C. 0
- D. Error Discuss
Correct Answer: -1
- 2. What will be the output of the program in Turbo C (under DOS)?
#include<stdio.h> int main() { struct emp { char *n; int age; }; struct emp e1 = {"Dravid", 23}; struct emp e2 = e1; strupr(e2.n); printf("%s\n", e1.n); return 0; }
Options- A. Error: Invalid structure assignment
- B. DRAVID
- C. Dravid
- D. No output Discuss
Correct Answer: DRAVID
- 3. What will be the output of the program?
#include<stdio.h> int main() { enum status {pass, fail, absent}; enum status stud1, stud2, stud3; stud1 = pass; stud2 = absent; stud3 = fail; printf("%d %d %d\n", stud1, stud2, stud3); return 0; }
Options- A. 0, 1, 2
- B. 1, 2, 3
- C. 0, 2, 1
- D. 1, 3, 2 Discuss
Correct Answer: 0, 2, 1
- 4. Point out the error in the program?
typedef struct data mystruct; struct data { int x; mystruct *b; };
Options- A. Error: in structure declaration
- B. Linker Error
- C. No Error
- D. None of above Discuss
Correct Answer: No Error
Explanation:
Here the type name
mystruct is known at the point of declaring the structure, as it is already defined.
- 5. Point out the error in the program?
struct emp { int ecode; struct emp e; };
Options- A. Error: in structure declaration
- B. Linker Error
- C. No Error
- D. None of above Discuss
Correct Answer: Error: in structure declaration
Explanation:
The structure
emp contains a member
e of the same type.(i.e)
struct emp. At this stage compiler does not know the size of sttructure.
- 6. Point out the error in the program?
#include<stdio.h> int main() { union a { int i; char ch[2]; }; union a z1 = {512}; union a z2 = {0, 2}; return 0; }
Options- A. Error: invalid union declaration
- B. Error: in Initializing z2
- C. No error
- D. None of above Discuss
Correct Answer: Error: in Initializing z2
- 7. Point out the error in the program?
#include<stdio.h> int main() { struct bits { float f:2; }bit; printf("%d\n", sizeof(bit)); return 0; }
Options- A. 4
- B. 2
- C. Error: cannot set bit field for float
- D. Error: Invalid member access in structure Discuss
Correct Answer: Error: cannot set bit field for float
- 8. Point out the error in the program?
#include<stdio.h> int main() { struct emp { char name[20]; float sal; }; struct emp e[10]; int i; for(i=0; i<=9; i++) scanf("%s %f", e[i].name, &e[i].sal); return 0; }
Options- A. Error: invalid structure member
- B. Error: Floating point formats not linked
- C. No error
- D. None of above Discuss
Correct Answer: Error: Floating point formats not linked
Explanation:
At run time it will show an error then program will be terminated.
Sample output: Turbo C (Windows)
c:\>myprogram
Sample
12.123
scanf : floating point formats not linked
Abnormal program termination
- 9. Point out the error in the program?
#include<stdio.h> int main() { struct emp { char n[20]; int age; }; struct emp e1 = {"Dravid", 23}; struct emp e2 = e1; if(e1 == e2) printf("The structure are equal"); return 0; }
Options- A. Prints: The structure are equal
- B. Error: Structure cannot be compared using '=='
- C. No output
- D. None of above Discuss
Correct Answer: Error: Structure cannot be compared using '=='
- 10. Point out the error in the program?
#include<stdio.h> int main() { struct emp { char name[25]; int age; float bs; }; struct emp e; e.name = "Suresh"; e.age = 25; printf("%s %d\n", e.name, e.age); return 0; }
Options- A. Error: Lvalue required/incompatible types in assignment
- B. Error: invalid constant expression
- C. Error: Rvalue required
- D. No error, Output: Suresh 25 Discuss
Correct Answer: Error: Lvalue required/incompatible types in assignment
Explanation:
We cannot assign a string to a struct variable like e.name = "Suresh"; in C.
We have to use strcpy(char *dest, const char *source) function to assign a string.
Ex: strcpy(e.name, "Suresh");
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