Declarations And Initializations(C Programming ) Questions and answers for exam Preparation

Question 1.

Is it true that a function may have several declarations, but only one definition?

Yes
No

Explanation:-

Answer: Option A. -> Yes

Yes, but the function declarations must be identical.

Question 2.

Is it true that a global variable may have several declarations, but only one definition?

Yes
No

Explanation:-

Answer: Option A. -> Yes

Yes, In all the global variable declarations, you need to use the keyword extern.

Question 3.

Global variable are available to all functions. Does there exist a mechanism by way of which

it available to some and not to others.

Yes
No

Explanation:-

Answer: Option B. -> No

The only way this can be achieved is to define the variable locally in main() instead of

defining it globally and then passing it to the functions which need it.

Question 4.

Suppose a program is divided into three files f1, f2 and f3, and a variable is defined in the file

f1 but used in files f2 and f3. In such a case would we need the extern declaration for the

variables in the files f2 and f3?

Yes
No

Explanation:-

Answer: Option A. -> Yes

No answer description available for this question.

Question 5.

Is there any difference in the following declarations?

int myfun(int arr[]);
int myfun(arr[20]);

Yes
No

Explanation:-

Answer: Option A. -> Yes

Yes, we have to specify the data type of the parameter when declaring a function.

Question 6.

Range of float id -2.25e+308 to 2.25e+308

True
False

Explanation:-

Answer: Option B. -> False

False, The range of float is -3.4e+38 to 3.4e+38.

Question 7.

Range of double is -1.7e-38 to 1.7e+38 (in 16 bit platform - Turbo C under DOS)

True
False

Explanation:-

Answer: Option B. -> False

False, The range of double is -1.7e+308 to 1.7e+308.

Question 8.

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.

True
False

Explanation:-

Answer: Option A. -> True

True, 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.

Question 9.

Size of short integer and long integer would vary from one platform to another.

True
False

Explanation:-

Answer: Option A. -> True

True, Depending on the operating system/compiler/system architecture you are working on,

the range of data types can vary.

Question 10.

Size of short integer and long integer can be verified using the sizeof() operator.

True

True
False

Explanation:-

Answer: Option A. -> True

True, we can find the size of short integer and long integer using the sizeof()
operator.
Example:

#include<stdio.h>
int main()
{
short int i = 10;
long int j = 10;
printf("short int is %d bytes., nlog int is %d bytes.",
sizeof (i), sizeof(j));
return 0;
}
Output:
short int is 2 bytes.
long int is 4 bytes.