# Languages-C & C Plus Plus [3i Infotech Placement]: Sample Questions 206 - 208 of 354

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## Question 206

C & C Plus Plus
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Essay▾

Who is an Actor?

### Explanation

• Actor interacts with the system and initiates the process (that is USECASE) .
• actor specifies a role of user or any other system that interacts with the subject.
• Primary actor of a use case calls on the system services.

## Question 207

C & C Plus Plus
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### Describe in Detail

Essay▾

What are enumerations?

### Explanation

• Enumerations consist of a set of named integer constants.
• Assigns names to integral constants, the names make a program easy to read and maintain.
• Enumeration stores one of the values of the enumeration set defined by that type.
• Enum can br used in indexing expressions and operands of all arithmetic and relational operators.

## Question 208

C & C Plus Plus
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### Describe in Detail

Essay▾

What is the output of the following program?

1. `main ()`
2. `{`
3. `    int y;`
4. `    scanf ( “%d” &y); //input given is 2000`
5. `    if ( (y%4 == 0 && y%100! =0)|y%100 == 0)`
6. `    printf ( “%d is a leap year” );`
7. `    else`
8. `    printf ( “%d is not a leap year” );`
9. `}`

### Explanation

• 2000 is a leap year
• In a program
 int y; Given a integer variable y scanf ( “% d” &y) ; Input the value of yInput given is 2000 if ( (y % 4 == 0 && y % 100! = 0) | y % 100 == 0)printf ( “% d is a leap year” ) ;elseprintf ( “% d is not a leap year” ) ; Condition to check if leap year or not.
• Here print the 2000 is a leap year.

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