CSCI 3328 Object Oriented Programming in C# Chapter 7 : Arrays – Exercises

1. CSCI 3328 Object Oriented Programming in C# Chapter 7: Arrays – Exercises Xiang Lian The University of Texas Rio Grande Valley Edinburg, TX 78539 xiang.lian@utrgv.edu

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: • intarr = 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 searchworks well for unsorted arrays

8. Debugging Errors constintarray_size = 5; array_size = 10; int [] b = new int [5]; For (inti =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 list.

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