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22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 cin >> priceRound; cout << "Enter length and width in inches\n" << "of a rectangular pizza: "; cin >> length >> width; cout << "Enter the price of a rectangular pizza: $"; cin >> priceRectangular; unitPriceRectangular = unitPrice(length, width, priceRectangular); unitPriceRound = unitPrice(diameter, priceRound); coutsetf(ios::fixed); coutsetf(ios::showpoint); coutprecision(2); cout << endl << "Round pizza: Diameter = " << diameter << " inches\n" << "Price = $" << priceRound << " Per square inch = $" << unitPriceRound << endl << "Rectangular pizza: Length = " << length << " inches\n" << "Rectangular pizza: Width = " << width << " inches\n" << "Price = $" << priceRectangular << " Per square inch = $" << unitPriceRectangular << endl; if (unitPriceRound < unitPriceRectangular) cout << "The round one is the better buy\n"; else cout << "The rectangular one is the better buy\n"; cout << "Buon Appetito!\n"; return 0; } double unitPrice(int diameter, double price) { const double PI = 314159; double radius, area; radius = diameter/double(2); area = PI * radius * radius; return (price/area); }
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63 64 65 66 67 double unitPrice(int length, int width, double price) { double area = length * width; return (price/area); }
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Welcome to the Pizza Consumers Union Enter the diameter in inches of a round pizza: 10 Enter the price of a round pizza: $850 Enter length and width in inches of a rectangular pizza: 6 4 Enter the price of a rectangular pizza: $755 Round pizza: Diameter = 10 inches Price = $850 Per square inch = $011 Rectangular pizza: Length = 6 inches Rectangular pizza: Width = 4 inches Price = $755 Per square inch = $031 The round one is the better buy Buon Appetito!
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You can specify a default argument for one or more call-by-value parameters in a function If the corresponding argument is omitted, then it is replaced by the default argument For example, the function volume in Display 48 computes the volume of a box from its length, width, and height If no height is given, the height is assumed to be 1 If neither a width nor a height is given, they are both assumed to be 1 Note that in Display 48 the default arguments are given in the function declaration but not in the function de nition A default argument is given the rst time the function is declared (or de ned, if that occurs rst) Subsequent declarations or a following de nition should not give the default arguments again because some compilers will consider this an error even if the arguments given are consistent with the ones given previously You may have more than one default argument, but all the default argument positions must be in the rightmost positions Thus, for the function volume in Display 48, we could have given default arguments for the last one, last two, or all three parameters, but any other combinations of default arguments are not allowed
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#include <iostream> using namespace std; void showVolume(int length, int width = 1, int height = 1); //Returns the volume of a box //If no height is given, the height is assumed to be 1 //If neither height nor width is given, both are assumed to be 1 int main( ) { showVolume(4, 6, 2); showVolume(4, 6); showVolume(4); return 0; } void showVolume(int length, int width, int height) { cout << "Volume of a box with \n" << "Length = " << length << ", Width = " << width << endl << "and Height = " << height << " is " << length*width*height << endl; }
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