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Test Your Knowledge: Exercises |
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1. Place a breakpoint in Run( ) on the following line, and then run the program:
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Console.WriteLine("Before starting: \n value of myInt: {0} \n value of myFloat: {1}", myInt, myFloat);
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What are the values of myInt and myFloat at the breakpoint 2. Step into the Multiply( ) method, up to the call to Divide( ). What are the values of theInt and theFloat at this point 3. Stop debugging, run the program again, and when it reaches the breakpoint in Run( ), set a watch on myInt. Step through the methods. When does the value of myInt change 4. Set another breakpoint in Add( ) at this line:
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theInt = theInt + theInt;
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Run the program. How many calls are in the call stack when the program reaches this breakpoint Exercise 9-2. The program in this exercise is similar to the first, but it has a logic error. Type this program into Visual Studio, or download it from this book s website:
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using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace Exercise_9_2 { class Tester { public void Run( ) { int myInt = 42; float myFloat = 9.685f; Console.WriteLine("Before starting: \n value of myInt: {0} \n value of myFloat: {1}", myInt, myFloat); // pass the variables by reference Multiply( ref myInt, ref myFloat ); Console.WriteLine("After finishing: \n value of myInt: {0} \n value of myFloat: {1}", myInt, myFloat); } private static void Multiply (ref int theInt, ref float theFloat) { theInt = theInt * 2; theFloat = theFloat *2; Divide( ref theInt, ref theFloat); } private static void Divide (ref int theInt, ref float theFloat)
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9: Basic Debugging
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{ theInt = theInt * 3; theFloat = theFloat * 3; Add(ref theInt, ref theFloat); } public static void Add(ref int theInt, ref float theFloat) { theInt = theInt - theInt; theFloat = theFloat - theFloat; } static void Main( ) { Tester t = new Tester( ); t.Run( ); } } }
If you run this program, you will not get the same results as you did in the preceding exercise. Use the debugging tools you just learned about to find the error. Correct the error, and then run the program again to see whether the results are correct. Exercise 9-3. Type the following program into Visual Studio, or download it from the book s website:
using using using using System; System.Collections.Generic; System.Linq; System.Text;
namespace Exercise_9_3 { class Program { public static int Factorial(int myInt) { int result = 1; for (int i = 1; i < myInt; i++) { result = result * i; } return result; } static void Main( ) { int input = 5; Console.WriteLine("{0} factorial is {1}", input, Factorial(input) ); } } }
Test Your Knowledge: Exercises |
This program is supposed to take the factorial of the value of input, except it s not working properly. (The factorial of n is the product of all the positive integers less than or equal to n. So, the factorial of 5 is 5 4 3 2 1=120.) Find the error and resolve it.
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9: Basic Debugging
10
Arrays
Almost all of the examples in previous chapters have dealt with one object at a time. In many applications, however, you want to work with a collection of objects all at the same time. The simplest collection in C# is the array, and it s the only collection type for which C# provides built-in support. The other collection types, such as stack and queue, are not part of the language; they are part of the Framework Class Library, and we ll cover those in detail in 14. The cool thing about arrays is that you can pass them around as though they were a single object, yet they contain several objects of the same type. Arrays really come into their own in combination with loops, which you learned about back in 5. In this chapter, you will learn to work with three types of arrays: one-dimensional arrays, multidimensional rectangular arrays, and jagged arrays.
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