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5: More Data Types and Operators
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// Use foreach using System; class ForeachDemo { static void Main() { int sum = 0; int[] nums = new int[10]; // Give nums some values for(int i = 0; i < 10; i++) nums[i] = i; // Use foreach to display and sum the values foreach(int x in nums) { ConsoleWriteLine("Value is: " + x); sum += x; } ConsoleWriteLine("Summation: " + sum); } }
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Cycle through nums using a foreach loop
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Value is: 0 Value is: 1 Value is: 2 Value is: 3 Value is: 4 Value is: 5 Value is: 6 Value is: 7 Value is: 8 Value is: 9 Summation: 45
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As this output shows, the foreach cycles through an array in sequence from the lowest index to the highest The foreach also works on multidimensional arrays It returns those elements in row order, from first to last
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// Use foreach on a two-dimensional array using System; class ForeachDemo2 { static void Main() { int sum = 0; int[,] nums = new int[3,5];
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// 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); } }
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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
Since the foreach can only cycle through an array 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 For example, here is another way to write the MinMax class shown earlier in this chapter that obtains the minimum and maximum from a set of values:
/* Find the minimum and maximum values in an array by using a foreach loop */ using System; class MinMax { static void Main() { int[] nums = { 99, -10, 100123, 18, -978, 5623, 463, -9, 287, 49 }; int min, max;
5: More Data Types and Operators
min = max = nums[0]; foreach(int val in nums) { if(val < min) min = val; if(val > max) max = val; } ConsoleWriteLine("Min and max: " + min + " " + max); } }
The foreach is an excellent choice in this application because the finding of a minimum or maximum value requires examining each element Other types of foreach applications include such things as computing an average, searching a list, and copying an array
Strings
From a day-to-day programming standpoint, one of the most important of C# s data types is string string 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 Actually, you have been using the string class since 1, but you did not know it When you create a string literal, you are actually creating a string object For example, in the statement
ConsoleWriteLine("In C#, strings are objects");
the string In C#, strings are objects is automatically made into a string object by C# Thus, the use of the string class has been below the surface in the preceding programs In this section, you will learn to handle them explicitly Be aware, however, that the string class is quite large, and we will only scratch its surface here It is a class that you will want to explore more fully on your own
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