chap03 - Chapter 3 Chapter Modifying Modifying objects objects Key Concepts Key assignment operation assignment conversion assignment precedence and

chap03 - Chapter 3 Chapter Modifying Modifying objects...

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Chapter 3 : Chapter 3 : Modifying Modifying objects objects
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Key Concepts: Key Concepts: assignment operation assignment conversion assignment precedence and associativity extraction operations const const declarations compound assignment operations input with cin cin increment and decrement operation strings
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Memory Depiction Memory Depiction Memory char chLetter = 'C'; 1007 chLetter 'C' short nTemperature = 32; 1005 1006 nTemperature 32 float y = 12.5; 1001 1002 1003 1004 y 12.5 1008 1009 1010 1011 …? iNumber int iNumber;
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Assignment Statement Assignment Statement Basic form object = expression object = expression ; Celsius = (Fahrenheit - 32) * 5 / 9; y = m * x + b; Action Expression is evaluated Expression value stored in object
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Assignment Statement Assignment Statement Define objects: Memory int iTotalNbr; iTotalNbr ? int iOldNbr = 21; iOldNbr 21 27 Evaluation 27 Store Assignment operation: iNewNbr + iOldNbr; iTotalNbr = iNewNbr 6 int iNewNbr = 6; 27 27 iOldNbr = iTotalNbr;
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Assignment Statement Assignment Statement How can we swap the value of two objects? How can we swap the value of two objects? Memory int Y = 20; Y 20 10 int X = 10; X Exchange the value of X and Y : X = Y; Y = X; What happened? What happened?
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Assignment Statement Assignment Statement After the assignment: After the assignment: Memory Y 20 20 X Exchange the value of X and Y : X = Y; Y = X;
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Assignment Statement Assignment Statement The correct swapping method: The correct swapping method: Memory int Y = 20; Y 20 Exchange the value of X and Y : int Z = X; Z 10 Define a temporary object Z to hold the starting value of X Y = Z; 10 X 10 int X = 10; X = Y; 20
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Assignment Statement Assignment Statement After the exchange: After the exchange: Memory Y 10 20 X 10 Z
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Assignment Statement Assignment Statement Incrementing Incrementing int i = 1; i = i + 1; Assign the value of expression i + 1 to i Evaluates to 2 i 1 2 i
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Compound Assignment Compound Assignment C++ has a large set of operators for applying an operation to an object and then storing the result back into the object ( See text book page 851, the appendix A.2 ) <<= >>= &= ^= |= += -= *= /= Examples int i = 3; i += 4; // i is now 7 cout << i << endl; float a = 3.2; a *= 2.0; // a is now 6.4 cout << a << endl;
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