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lay/lie The word lay needs to be followed by a direct object, whereas the word lie is followed by an indication of direction Remember this difference by keeping in mind that lie and direction both have the letter i as their second letter Lay means to put or place something somewhere Lie means to rest or recline

This is the output produced:

Value is: Value is: Value is: Value is: Value is: Summation 0 1 2 3 4 of first 5 elements: 10

3 2 1 0 1 2 3

As is evident, the foreach loop stops after the fifth element has been obtained The foreach loop also works on multidimensional arrays It returns those elements in row order, from first to last

// Use foreach on a two-dimensional array using System; class ForeachDemo2 { static void Main() { int sum = 0; int[,] nums = new int[3,5];

7:

27 8 1 0 1 8 27

// Give nums some values for(int i = 0; i < 3; i++) for(int j=0; j < 5; j++) nums[i,j] = (i+1)*(j+1); // Use foreach to display and sum the values foreach(int x in nums) { ConsoleWriteLine("Value is: " + x); sum += x; } ConsoleWriteLine("Summation: " + sum); } }

The output from this program is shown here:

Value is: 1 Value is: 2 Value is: 3 Value is: 4 Value is: 5 Value is: 2 Value is: 4 Value is: 6 Value is: 8 Value is: 10 Value is: 3 Value is: 6 Value is: 9 Value is: 12 Value is: 15 Summation: 90

Less is used for quantities and degree Fewer is used for numbers (countable units)

Since the foreach loop can only cycle through an array sequentially, from start to finish, you might think that its use is limited However, this is not true A large number of algorithms require exactly this mechanism, of which one of the most common is searching For example, the following program uses a foreach loop to search an array for a value It stops if the value is found

We plot these points on a single set of axes (Figure 121) Supposing that the curve we seek to draw is a smooth interpolation of these points (calculus will later show us that this supposition is correct), we find that our curve is as shown in Figure 122 This curve is called a cubic

// Search an array using foreach using System; class Search { static void Main() { int[] nums = new int[10]; int val; bool found = false; // Give nums some values for(int i = 0; i < 10; i++) nums[i] = i; val = 5;

Part I:

// Use foreach to search nums for key foreach(int x in nums) { if(x == val) { found = true; break; } } if(found) ConsoleWriteLine("Value found!"); } }

It is convenient to make a table of values:

The output is shown here:

Value found!

The foreach loop is an excellent choice in this application because searching an array involves examining each element Other types of foreach applications include such things as computing an average, finding the minimum or maximum of a set, looking for duplicates, and so on As you will see later in this book, foreach is especially useful when operating on other types of collections

From a day-to-day programming standpoint, string is one of C# s most important data types because it defines and supports character strings In many other programming languages, a string is an array of characters This is not the case with C# In C#, strings are objects Thus, string is a reference type Although string is a built-in data type in C#, a discussion of string needed to wait until classes and objects had been introduced Actually, you have been using the string class since 2, but you did not know it When you create a string literal, you are actually creating a string object For example, in the statement

4 3 2 1 0 1 2 3

There were fewer applicants for the job There was less completion You must make fewer mistakes in order to keep your job I trust there will be less cause for complaint

ConsoleWriteLine("In C#, strings are objects");