Which of the declaration is correct? int length; char int; int long; float doubl

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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).

Declarations and Initializations problems

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1. 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

2. 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.

3.

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

4. 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

Discuss

5. 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

6. Which of the following correctly represents a long double constant?
Options
A. 6.68
B. 6.68L
C. 6.68f
D. 6.68LF

Discuss

7. 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

Discuss

8. Size of short integer and long integer would vary from one platform to another.
Options
A. True
B. False

Discuss

10. 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

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Which of the declaration is correct?

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1 :	typedef long a; extern int a c;
2 :	typedef long a; extern a int c;
3 :	typedef long a; extern a c;

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Discussion

Which of the declaration is correct?

Declarations and Initializations problems

Search Results

More in C Programming:

Aptitude

Engineering

Programming

Reasoning

Links

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