# C Programming - Declarations and Initializations

### Exercise :: Declarations and Initializations - Point Out Correct Statements

1.

Which of the declaration is correct?

 A. int length; B. char int; C. int long; D. float double;

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).

2.

Which of the following operations are INCORRECT?

 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;``

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.

Which of the following correctly represents a long double constant?

 A. 6.68 B. 6.68L C. 6.68f D. 6.68LF

Explanation:

6.68 is double.
6.68L is long double constant.
6.68f is float constant.
6.68LF is not allowed in c.

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; };``````

 A. 1 B. 2 C. 3 D. 1, 2, 3

Explanation:

Option B gives "Undefined structure in 'aa'" error.

5.

Which of the structure is correct?
 1 : ``````struct book { char name; float price; int pages; };`````` 2 : ``````struct aa { char name; float price; int pages; }`````` 3 : ``````struct aa { char name; float price; int pages; }``````

 A. 1 B. 2 C. 3 D. All of above