arrays

Question 1

Define an array in programming.

Answer 1

An array is a variable that can store multiple values of the same data type, identified by an index or subscript.

Question 2

What is meant by the term ‘index’ in arrays?

Answer 2

The index or subscript is the zero-based position reference of elements in an array.

Question 3

Declare an array called marks to hold marks for 10 students.

Answer 3

int[] marks = new int[10];

Question 4

Assign the following values to an array: 58, 72, 77, 83, 90, 64, 76, 80, 69, 71

Answer 4

Use marks[0] = 58;, marks[1] = 72; … until marks[9] = 71;

Question 5

Write a code segment to calculate the sum of an array using a loop.

Answer 5

int sum = 0;
for(int k=0; k<marks.Length; k++) {
sum += marks[k];
}

Question 6

What does marks.Length return?

Answer 6

It returns the number of elements in the array — in this case, 10.

Question 7

Declare and initialize an array with the first four months of the year.

Answer 7

string[] months = { “January”, “February”, “March”, “April” };

Question 8

What error exists in the loop: for (int k = 0; k <= arrValues.Length; k–)?

Answer 8

k– causes an infinite loop. It should be k++ and condition should be k < arrValues.Length.

Question 9

Identify and fix this line: sum + arrValues[k];

Answer 9

Should be sum += arrValues[k];

Question 10

What does String[] arrValues = st.Split(‘,’); do?

Answer 10

Splits the string st into an array using , as the delimiter.