Testing program for the function round in Software

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Testing program for the function round
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Display 36 The Function round (part 2 of 2)
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15 16 17 18 19 20 21 22 23 24 25 26 cout << "Rounded that number is " << round(doubleValue) << endl; cout << "Again (y/n): "; cin >> ans; }while (ans == y || ans == Y ); cout << "End of testing\n"; return 0; } //Uses cmath: int round(double number) { return static_cast<int>(floor(number + 05)); }
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Enter a double value: 96 Rounded, that number is 10 Again (y/n): y Enter a double value: 249 Rounded, that number is 2 Again (y/n): n End of testing
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7 What is the output produced by the following program
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#include <iostream> using namespace std; char mystery(int firstParameter, int secondParameter); int main( ) { cout << mystery(10, 9) << "ow\n"; return 0; } char mystery(int firstParameter, int secondParameter) { if (firstParameter >= secondParameter) return W ; else return H ; }
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8 Write a function declaration (function prototype) and a function definition for a function that takes three arguments, all of type int, and that returns the sum of its three arguments 9 Write a function declaration and a function definition for a function that takes one argument of type double The function returns the character value P if its argument is positive and returns N if its argument is zero or negative 10 Can a function definition appear inside the body of another function definition 11 List the similarities and differences between how you invoke (call) a predefined (that is, library) function and a user-defined function
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s FUNCTIONS THAT RETURN A BOOLEAN VALUE
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The returned type for a function can be the type bool A call to such a function returns one of the values true or false and can be used anywhere that a Boolean expression is allowed For example, it can be used in a Boolean expression to control an if-else statement or to control a loop statement This can often make a program easier to read By means of a function declaration, you can associate a complex Boolean expression with a meaningful name For example, the statement
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if (((rate >= 10) && (rate < 20)) || (rate == 0)) { }
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if (appropriate(rate)) { }
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provided that the following function has been de ned:
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bool appropriate(int rate) { return (((rate >= 10) && (rate < 20)) || (rate == 0)); }
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12 Write a function definition for a function called inOrder that takes three arguments of type int The function returns true if the three arguments are in ascending order; otherwise, it returns false For example, inOrder(1, 2, 3) and inOrder(1, 2, 2) both return true, whereas inOrder(1, 3, 2) returns false
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13 Write a function definition for a function called even that takes one argument of type int and returns a bool value The function returns true if its one argument is an even number; otherwise, it returns false 14 Write a function de nition for a function isDigit that takes one argument of type char and returns a bool value The function returns true if the argument is a decimal digit; otherwise, it returns false
s DEFINING void FUNCTIONS
In C++ a void function is de ned in a way similar to that of functions that return a value For example, the following is a void function that outputs the result of a calculation that converts a temperature expressed in degrees Fahrenheit to a temperature expressed in degrees Celsius The actual calculation would be done elsewhere in the program This void function implements only the subtask for outputting the results of the calculation
void showResults(double fDegrees, double cDegrees) { coutsetf(ios::fixed); coutsetf(ios::showpoint); coutprecision(1); cout << fDegrees << " degrees Fahrenheit is equivalent to\n" << cDegrees << " degrees Celsius\n"; }
As the above function de nition illustrates, there are only two differences between a function de nition for a void function and for a function that returns a value One difference is that we use the keyword void where we would normally specify the type of the value to be returned This tells the compiler that this function will not return any value The name void is used as a way of saying no value is returned by this function The second difference is that a void function de nition does not require a return statement The function execution ends when the last statement in the function body is executed A void function call is an executable statement For example, the above function showResults might be called as follows:
showResults(325, 03);