1. The University of Texas – Pan American
CSCI 3328 Object Oriented Programming in C# Chapter 7: Arrays – Exercises
Xiang Lian
The University of Texas – Pan American
Edinburg, TX 78539
This set of slides is revised from lecture slides of Prof. John Abraham. -- Xiang Lian

2. Objectives In this chapter, you will do some exercises about:
1-dimenionsal or multidimensional arrays
Data manipulations in arrays

3. Multiple Choices
Lists and tables of values with the same data type can be stored in _____.
A. variables B. arrays C. indexes D. keywords
The _________ statement allows you to iterate through the elements in an array without using a counter.
A. for B. each C. for each D. foreach
The number that refers to a particular array element is called the element's _______.
A. number B. data type C. index D. class
An array that uses two indices is referred to as a(n) _____ array.
A. 1-dimensional B. 2-dimensional C. matrix D. list
Which of the following statements is true to iterate all elements in the array?
A. for (int i = 0; i < array.Length; i++)
B. for (int i = 1; i < array.Length; i++)
C. for (int i = 1; i <= array.Length; i++)
D. for (int i = 0; i <= array.Length; i++)

4. Multiple Choices (cont'd)
Use the foreach header _____ to iterate through double array numbers.
A. for each (double d=1; d<numbers.Length; d++)
B. foreach (double d = 1 in numbers)
C. foreach (double d in numbers)
D. for each (double d = numbers[])
Command-line arguments are stored in _____.
A. string [] args B. string args C. char args D. char [] args
Use the expression _____ to receive the total number of arguments in a command line.
A. args.length B. args.Length() C. args.GetLength() D. args.Length
The indexed array name of one-dimensional array units's element 2 is _______.
A. units{1} B. units(2) C. units[0, 2] D. units [1]

5. Multiple Choices (cont'd)
Which of the following sorts array averageRainfall?
A. Array(averageRainfall).Sort()
B. Sort.Array(averageRainfall)
C. Sort(averageRainfall)
D. Array.Sort(averageRainfall)

6. True/False Statements
A single array can store values of different types.
An array index should normally be of type float.
An individual array element that is passed to a method and modified in that method will contain the modified value when the called method completes execution.
Command-line arguments are separated by commas.

7. True/False Statements (cont'd)
The declaration of an array of size 11 is as follows:
int arr = new int [10];
The modification of an array element is as follows:
10 = arr[0];
The declaration of a 2-dimensional array is as follows:
int [ ] arr = new int [20][10];
The declaration of a 10*10 array is as follows:
int [,] arr = new int [11, 11];
The linear search in arrays requires elements in a sorted order.
The binary search works well for unsorted arrays

8. Debugging Errors
const int array_size = 5; array_size = 10; int [] b = new int [5]; For (int i =0; i<=b.Length; i++) b[i]=1; int [] a = {1, 2, , 4, 5}; b=a; int [,] c={{1,2}, {3, 4}}; c[1][1] = 5;

9. Debugging Errors (cont'd)
int [, ] array = new int [3, 3]; for (int i = 0; i<=3; i++) for (int j=0; j<=3; j++) array [i, j] = i+j;

10. Write a Program
Write a complete program to generate random number between 1 and 99, and output the resulting number to a resultTextBox.

11. Write a Program (cont'd)
Declare an array, numArray, to hold 100 integer numbers
Assign random numbers within [1, 100] into this array
Sort this array
Check whether a number 50 exists in this array using the linear search and foreach statement
Output the multiplication of all even integers in this array; if no even numbers exist, then output 1