Question

C++ Questions:

1. True/False: an int uses 4 bytes in memory on all systems.

2. True/False: a double typically offers better precision than a float.

3. True/False: The following two statements are equivalent assuming isPair is a variable of type bool:

if (isPair)
if (isPair == true)

4. Provide a value we could put in the blank so that the value of x will be 20 after the code snippet.

int x = _____;
x *= 4;

5. Provide a value we could put in the blank so that the value of x will be 7 after the code snippet.

int x = _____;
x = x % 10;

6. What is the error in the code below:

string slogan = 'Go Giants!';

Answer 1

Solution:

(1)

The answer will be "False"

Explanation:

=>If processor system is 16 bits then size of int = 2 bytes

=>If processor system is 32 bits then size of int = 4 bytes

=>So on the basis of above statements we can say that int can take 2 byte or 4 byte depending upon the processor system.

(2)

The answer will be "true"

Explanation:

=>Double uses more bits after decimal point as compared to float and it gives more precise computation.

(3)

The answer will be "true"

Explanation:

=>In if(isPair), isPair is a boolean variable if value of isPair = 1 then if condition will be true otherwise false.

=>In if(isPair == 1) isPair boolean variable's value will be compared with 1 if the value of isPair variable is 1 then condition isPair == 1 will return true otherwise false.

=>Hence on the basis of above statements we can say that given both expressions are equivalent.

(4)

The answer will be "5".

Explanation:

=>x *= 4; means x = x*4 so when x = 5 value of x = 5*4 means x = 20.

(5)

The answer will be "7"

Explanation:

=>x = x % 10 where % is modulus operator.

=>When x = 7, x = 7 % 10 will imply x = 7.

(6)

The answer will be "Instead of single quotes there should be double quotes"

Explanation:

=>As slogan is of string type so 'Go Giants!' is not correct because in single quote characters are represented not string so there should be double quotes.

I have explained each and every part with the help of statements attached to it.