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- Question
Which of the structure is incorrcet?
1 : struct aa { int a; float b; };2 : struct aa { int a; float b; struct aa var; };3 : struct aa { int a; float b; struct aa *var; };
Options- A. 1
- B. 2
- C. 3
- D. 1, 2, 3
- Correct Answer
- 2
ExplanationOption B gives "Undefined structure in 'aa'" error.
Declarations and Initializations problems
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- 1. What is the output of the program?
#include<stdio.h> int main() { union a { int i; char ch[2]; }; union a u; u.ch[0] = 3; u.ch[1] = 2; printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); return 0; }
Options- A. 3, 2, 515
- B. 515, 2, 3
- C. 3, 2, 5
- D. None of these Discuss
Correct Answer: 3, 2, 515
Explanation:
printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); It prints the value of u.ch[0] = 3, u.ch[1] = 2 and it prints the value of u.i means the value of entire union size.
So the output is 3, 2, 515.
- 2. What will be the output of the program?
#include<stdio.h> int main() { int X=40; { int X=20; printf("%d ", X); } printf("%d\n", X); return 0; }
Options- A. 40 40
- B. 20 40
- C. 20
- D. Error Discuss
Correct Answer: 20 40
Explanation:
In case of a conflict between a local variable and global variable, the local variable gets priority.- 3. What is the output of the program
#include<stdio.h> int main() { struct emp { char name[20]; int age; float sal; }; struct emp e = {"Tiger"}; printf("%d, %f\n", e.age, e.sal); return 0; }
Options- A. 0, 0.000000
- B. Garbage values
- C. Error
- D. None of above Discuss
Correct Answer: 0, 0.000000
Explanation:
When an automatic structure is partially initialized remaining elements are initialized to 0(zero).- 4. What is the output of the program
#include<stdio.h> int main() { int x = 10, y = 20, z = 5, i; i = x < y < z; printf("%d\n", i); return 0; }
Options- A. 0
- B. 1
- C. Error
- D. None of these Discuss
Correct Answer: 1
Explanation:
Since x < y turns to be TRUE it is replaced by 1. Then 1 < z is compared and to be TRUE. The 1 is assigned to i.- 5. What is the output of the program in Turbo C (in DOS 16-bit OS)?
#include<stdio.h> int main() { char *s1; char far *s2; char huge *s3; printf("%d, %d, %d\n", sizeof(s1), sizeof(s2), sizeof(s3)); return 0; }
Options- A. 2, 4, 6
- B. 4, 4, 2
- C. 2, 4, 4
- D. 2, 2, 2 Discuss
Correct Answer: 2, 4, 4
Explanation:
Any pointer size is 2 bytes. (only 16-bit offset)
So, char *s1 = 2 bytes.
So, char far *s2; = 4 bytes.
So, char huge *s3; = 4 bytes.
A far, huge pointer has two parts: a 16-bit segment value and a 16-bit offset value.Since C is a compiler dependent language, it may give different output in other platforms. The above program works fine in Windows (TurboC), but error in Linux (GCC Compiler).
- 6.
1 : typedef long a;
extern int a c;2 : typedef long a;
extern a int c;3 : typedef long a;
extern a c;
Options- A. 1 correct
- B. 2 correct
- C. 3 correct
- D. 1, 2, 3 are correct Discuss
Correct Answer: 3 correct
Explanation:
typedef long a;
extern int a c; while compiling this statement becomes extern int long c;. This will result in to "Declaration syntax error".typedef long a;
extern a int c; while compiling this statement becomes extern long int c;. This will result in to "Too many types in declaration error".typedef long a;
extern a c; while compiling this statement becomes extern long c;. This is a valid c declaration statement. It says variable c is long data type and defined in some other file or module.So, Option C is the correct answer.
- 7. Which of the following operations are INCORRECT?
Options- A.
int i = 35; i = i%5; - B.
short int j = 255; j = j; - C.
long int k = 365L; k = k; - D.
float a = 3.14; a = a%3;
Discuss
Correct Answer:float a = 3.14; a = a%3;
Explanation:
float a = 3.14; a = a%3; gives "Illegal use of floating point" error.The modulus (%) operator can only be used on integer types. We have to use fmod() function in math.h for float values.
- 8. Which of the structure is correct?
1 : struct book { char name[10]; float price; int pages; };2 : struct aa { char name[10]; float price; int pages; }3 : struct aa { char name[10]; float price; int pages; }
Options- A. 1
- B. 2
- C. 3
- D. All of above Discuss
Correct Answer: 1
Explanation:
In 2 and 3 semicolon are missing in structure element.- 9. Which of the declaration is correct?
Options- A. int length;
- B. char int;
- C. int long;
- D. float double; Discuss
Correct Answer: int length;
Explanation:
int length; denotes that variable length is int(integer) data type.char int; here int is a keyword cannot be used a variable name.
int long; here long is a keyword cannot be used a variable name.
float double; here double is a keyword cannot be used a variable name.
So, the answer is int length;(Option A).
- 10. Which of the following correctly represents a long double constant?
Options- A. 6.68
- B. 6.68L
- C. 6.68f
- D. 6.68LF Discuss
Correct Answer: 6.68L
Explanation:
6.68 is double.
6.68L is long double constant.
6.68f is float constant.
6.68LF is not allowed in c.
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- 1. What is the output of the program?