F129 Introduction To Programming Test 1

1. The result of this expression 3 + 5 * 2 + 4 is

20

64

17

None of the above

A computer language uses operator precedence (hierarchy) similar to what we use in maths (BODMAS).

Explanation

A computer language uses operator precedence (hierarchy) similar to what we use in maths (BODMAS).

2. How would you end a module which gives back the addition of 3 numbers. The module so far looks like this
CalculateSum(Integer a, Integer b, Integer c)
Integer sum = a + b + c

End

Exit

Return sum

None of the above

The correct answer is "Return sum" because the module is designed to calculate the sum of three numbers and the result is stored in the variable "sum". To end the module and provide the calculated sum as the output, the "Return" statement is used. This will return the value of the "sum" variable and terminate the execution of the module.

Explanation

The correct answer is "Return sum" because the module is designed to calculate the sum of three numbers and the result is stored in the variable "sum". To end the module and provide the calculated sum as the output, the "Return" statement is used. This will return the value of the "sum" variable and terminate the execution of the module.

3. What is the data type of "hello "+name, where name is some variable storing the user's name

String

Character

Integer

None of the above

The data type of "hello "+name would be a string because when we concatenate the string "hello " with the variable name, the result will be a string. In programming, when we combine two strings together, the result is always a new string. Therefore, the correct answer is String.

Explanation

The data type of "hello "+name would be a string because when we concatenate the string "hello " with the variable name, the result will be a string. In programming, when we combine two strings together, the result is always a new string. Therefore, the correct answer is String.

4. How would you call the module from the Control module to give you back the result of the sum, using the module mentioned in the previous question. So far the Control module looks like this:
Control
   Print "Give me three numbers"
   Integer x
   Enter x
   Integer y
   Enter y
   Integer z
   Enter z

Process CalculateSum(x,y,z)

Process CalculateSum(a, b, c)

Process CalculateSum(*x,*y,*z)

Process CalculateSum(*a, *b, *c)

None of the above

The correct answer is "Process CalculateSum(x,y,z)" because this line of code is calling the CalculateSum module and passing the variables x, y, and z as arguments. This means that the Control module is instructing the CalculateSum module to perform the calculation and return the result. The asterisks (*) in the other options are not valid syntax and do not correctly call the CalculateSum module.

Explanation

The correct answer is "Process CalculateSum(x,y,z)" because this line of code is calling the CalculateSum module and passing the variables x, y, and z as arguments. This means that the Control module is instructing the CalculateSum module to perform the calculation and return the result. The asterisks (*) in the other options are not valid syntax and do not correctly call the CalculateSum module.

5. The AND and OR logical operators take two operands one on each side. What are the data types of these operands?

String

Integer

Character

Boolean

None of the above

The operands are some boolean expression.E.g. if you want to check some mark if its greater or equal to 0 and smaller or equal to 100 you would do something like this: if mark >= 0 AND mark = 0 gives true or false, and mark =0 AND mark

Explanation

The operands are some boolean expression.E.g. if you want to check some mark if its greater or equal to 0 and smaller or equal to 100 you would do something like this: if mark >= 0 AND mark = 0 gives true or false, and mark =0 AND mark

6. Call-by-value is

When you declare a variable of some certain data type

When a variable's value is copied into a parameter when calling some method

When you refer to a variable

When you assign a value to a variable

You can pass a variable to a method using call-by-value or call-by-reference. Call-by-value is simply copied into the parameter, but call-by-reference is when the actual variable is being referenced by the method you are calling. Refer to the revision sheet 2 for more information.

Explanation

You can pass a variable to a method using call-by-value or call-by-reference. Call-by-value is simply copied into the parameter, but call-by-reference is when the actual variable is being referenced by the method you are calling. Refer to the revision sheet 2 for more information.

7. The data type of the following expression squareroot(14) is

Integer

String

Real

3.741

Reals are those numbers with a decimal point

Explanation

Reals are those numbers with a decimal point