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- Question
If the definition of the external variable occurs in the source file before its use in a particular function, then there is no need for an extern declaration in the function.
Options- A. True
- B. False
- Correct Answer
- True
ExplanationTrue, When a function is declared inside the source file, that function(local function) get a priority than the extern function. So there is no need to declare a function as extern inside the same source file.
Declarations and Initializations problems
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- 1. 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.
- 2. 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).
- 3. 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.- 4. 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.
- 5.
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.
- 6. Size of short integer and long integer would vary from one platform to another.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, Depending on the operating system/compiler/system architecture you are working on, the range of data types can vary.- 7. Range of float id -2.25e+308 to 2.25e+308
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
False, The range of float is -3.4e+38 to 3.4e+38.- 8. A long double can be used if range of a double is not enough to accommodate a real number.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, we can use long double; if double range is not enough.double = 8 bytes.
long double = 10 bytes.- 9. Range of double is -1.7e-38 to 1.7e+38 (in 16 bit platform - Turbo C under DOS)
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
False, The range of double is -1.7e+308 to 1.7e+308.- 10. A float is 4 bytes wide, whereas a double is 8 bytes wide.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True,
float = 4 bytes.
double = 8 bytes.
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