string mascot(string university)
{
if (university == "Illinois")
return "Fighting Illini";
else if (university == "Indiana")
return "Hoosiers";
else if (university == "Iowa")
return "Hawkeyes";
else if (university == "Michigan")
return "Wolverines";
else if (university == "Michigan State")
return "Spartans";
else if (university == "Minnesota")
return "Golden Gophers";
else if (university == "Northwestern")
return "Wildcats";
else if (university == "Ohio State")
return "Buckeyes";
else if (university == "Penn State")
return "Nittany Lions";
else if (university == "Purdue")
return "Boilermakers";
else if (university == "Wisconsin")
return "Badgers";
else
{
cerr << "mascot: " << university
<< " is not known by this program!";
return "";
}
}
|
#include <iostream> // cin, cout, <<, >>
#include <string> // string, ==, getline()
using namespace std;
string mascot(string university);
int main()
{
string school;
cout << "\nEnter a Big 10 school (Q to quit): ";
getline(cin, school);
while (school != "Q" && school != "q")
{
cout << mascot(school) << endl;
cout << "\nEnter a Big 10 school (Q to quit): ";
getline(cin, school);
}
}
/*** Insert definition of mascot() from Figure 6.1 here ***/ |
Enter a Big 10 school (Q to quit): Michigan Wolverines Enter a Big 10 school (Q to quit): Ohio State Buckeyes Enter a Big 10 school (Q to quit): Missouri Mascot: Missouri is not known by this program! Enter a Big 10 school (Q to quit): Minnesota Golden Gophers Enter a Big 10 school (Q to quit): Q |
#include <iostream> // cin, cout, <<, >>
#include <string> // string
using namespace std;
#include "Heat.h" // fahrToCelsius(), celsiusToFahr(), ...
int main()
{
const string MENU = "To convert arbitrary temperatures, enter:\n"
" A - to convert Fahrenheit to Celsius;\n"
" B - to convert Celsius to Fahrenheit;\n"
" C - to convert Celsius to Kelvin;\n"
" D - to convert Kelvin to Celsius;\n"
" E - to convert Fahrenheit to Kelvin; or\n"
" F - to convert Kelvin to Fahreneht.\n"
"--> ";
cout << MENU;
char conversion;
cin >> conversion;
cout << "\nEnter the temperature to be converted: ";
double temperature;
cin >> temperature;
double result;
switch (conversion)
{
case 'A': case 'a':
result = fahrToCelsius(temperature);
break;
case 'B': case 'b':
result = celsiusToFahr(temperature);
break;
case 'C': case 'c':
result = celsiusToKelvin(temperature);
break;
case 'D': case 'd':
result = kelvinToCelsius(temperature);
break;
case 'E': case 'e':
result = fahrToKelvin(temperature);
break;
case 'F': case 'f':
result = kelvinToFahr(temperature);
break;
default:
cerr << "\n*** Invalid conversion: "
<< conversion << endl;
result = 0.0;
}
cout << "The converted temperature is " << result << endl;
}
|
To convert arbitrary temperatures, enter: A - to convert Fahrenheit to Celsius; B - to convert Celsius to Fahrenheit; C - to convert Celsius to Kelvin; D - to convert Kelvin to Celsius; E - to convert Fahrenheit to Kelvin; or F - to convert Kelvin to Fahrenheit. --> B Enter the temperature to be converted: 100 The converted temperature is 212 |
string yearName(int yearCode)
{
switch (yearCode)
{
case 1:
return "Freshman";
case 2:
return "Sophomore";
case 3:
return "Junior";
case 4:
return "Senior";
case 5:
return "Graduate";
default:
cerr << "yearName: code error: " << yearCode << endl;
return "";
}
}
|
#include <iostream> // cout, <<
#include <string> // string
using namespace std;
string yearName(int yearCode);
int main()
{
int number;
cout << "Enter the number of a class year: ";
cin >> number;
cout << yearName(number) << endl;
}
/*** Insert the definition of yearName() from Figure 6.4 here ***/
|
Enter the number of a class year: 1 Freshman Enter the number of a class year: 3 Junior Enter the number of a class year: 6 YearName: code error: 6 |
char letterGrade(double weightedAverage)
{
switch ( int(weightedAverage) / 10 )
{
case 10: // int(100)/10 -> 10
case 9: // int(90-99)/10 -> 9
return 'A';
case 8: // int(80-89)/10 -> 8
return 'B';
case 7: // int(70-79)/10 -> 7
return 'C';
case 6: // int(60-69)/10 -> 6
return 'D';
default: // not so good!
return 'F';
}
}
|
#include <iostream> // cin, cout, >>, <<
using namespace std;
char letterGrade(double weightedAverage);
int main()
{
const double HOMEWORK_WEIGHT = 0.2, // weights for homework,
TEST_WEIGHT = 0.5, // tests,
EXAM_WEIGHT = 0.3; // and the exam.
cout << "This program computes a final course grade using the\n"
<<"homework average, test average, and a final exam "
<<"score.\n";
cout << "\nEnter the homework average, test average, "
<< "and exam score:\n";
double homeworkAverage, // the average of the homework scores
testAverage, // the average of the test scores
examScore; // the final-exam score
cin >> homeworkAverage >> testAverage >> examScore;
double finalAverage = HOMEWORK_WEIGHT * homeworkAverage +
TEST_WEIGHT * testAverage +
EXAM_WEIGHT * examScore;
char grade = letterGrade(finalAverage); // the letter grade received
cout << "Final Average = " << finalAverage
<< ", Grade = " << grade << "\n\n";
}
/*** Insert definition of letterGrade() from Figure 6.6 here ***/
|
This program computes a final course grade using the homework average, test average, and a final-exam score. Enter the homework average, test average, and exam score: 100 100 100 Final Average = 100, Grade = A . . . Enter the homework average, test average, and exam score: 30 40 50 Final Average = 41, Grade = F . . . Enter the homework average, test average, and exam score: 56.2 62.7 66.5 Final Average = 62.54, Grade = D . . . Enter the homework average, test average, and exam score: 87.5 91.3 80 Final Average = 87.15, Grade = B |
#include <iostream> // cout, cin, <<, >>
using namespace std;
int main()
{
cout << "Enter two binary inputs: ";
short digit1, digit2; // the two binary inputs
cin >> digit1 >> digit2;
// the two circuit outputs
bool sum = (digit1 || digit2) && !(digit1 && digit2),
carry = (digit1 && digit2);
cout << "Carry = " << carry << " Sum = " << sum << "\n\n";
}
|
Enter two binary inputs: 0 0 Carry = 0 Sum = 0 Enter two binary inputs: 0 1 Carry = 0 Sum = 1 Enter two binary inputs: 1 0 Carry = 0 Sum = 1 Enter two binary inputs: 1 1 Carry = 1 Sum = 0 |
#include <iostream> // ostream class
#include <string> // the string class
#include <cassert> // assert()
using namespace std;
class Name
{
public:
Name(); // constructors
Name(string first, string middle, string last);
string getFirstName() const; // accessors
string getLastName() const;
char getMiddleInitial() const;
string getSignature() const;
void setFirstName(string newFirstName); // mutators
// setMiddleName() left as an exercise
void setLastName(string newLastName);
void print(ostream& out) const; // I/O methods
void read(istream& in);
// ... other Name-operation declarations go here
private:
string myFirstName,
myMiddleName,
myLastName;
};
// ... constructor, accessor definitions omitted ...
inline void Name::setFirstName(string newFirstName)
{
myFirstName = newFirstName;
}
// setMiddleName() left as an exercise
inline void Name::setLastName(string newLastName)
{
myLastName = newLastName;
}
inline void Name::read(istream& in)
{
in >> myFirstName >> myMiddleName >> myLastName;
}
|
#include <iostream> // cin, cout, >>, <<
#include "Name.h" // Name
using namespace std;
int main()
{
cout << "Enter a full name (first, middle, last): ";
Name aName;
aName.read(cin);
aName.print(cout);
cout << endl;
aName.setFirstName("Yertle");
aName.setLastName("Turtle");
aName.print(cout);
}
-----------
Sample run:
Enter a full name (first, middle, last): Popeye the Sailorman
Popeye the Sailorman
Yertle the Turtle
|
#include <iostream> // istream
#include <cmath> // pow()
using namespace std;
const double PI = 3.14159;
class Sphere
{
public:
Sphere();
double getWeight() const;
// ... other Sphere accessors omitted...
void setRadiusAndDensity(double radius, double density);
void setRadiusAndWeight(double radius, double weight);
void setDensityAndWeight(double density, double weight);
void print(ostream& out) const;
void readRadiusAndDensity(istream& in);
void readRadiusAndWeight(istream& in);
void readDensityAndWeight(istream& in);
// ... other Sphere operations omitted...
private:
double myRadius, myWeight, myDensity;
};
// ... "simple" Sphere method definitions...
|
#include "Sphere.h" // our Sphere class
void Sphere::setRadiusAndDensity(double radius, double density)
{
if (radius > 0 && density > 0) // validate arguments
{ // update attributes
myWeight = density * 4.0 * PI * pow(radius, 3) / 3.0;
myRadius = radius;
myDensity = density;
}
else // precondition failed
{
cerr << "setRadiusAndDensity(r, d): invalid arguments "
<< " r = " << radius << ", d = " << density;
myRadius = myDensity = myWeight = 0.0;
}
}
// ... other Sphere mutators left as exercises ...
void Sphere::readRadiusAndDensity(istream& in)
{
double newRadius, newDensity;
in >> newRadius >> newDensity; // read inputs from in
if (newRadius > 0 && newDensity > 0) // validate inputs
{ // update attributes
myWeight = newDensity * 4.0 * PI * pow(newRadius, 3) / 3.0;
myRadius = newRadius;
myDensity = newDensity;
}
else // precondition failed
{
cerr << "readRadiusAndDensity(in): invalid input values "
<< " r = " << newRadius << ", d = " << newDensity;
myRadius = myDensity = myWeight = 0.0;
}
}
|
#include <iostream> // cin, cout, >>, <<
#include "Sphere.h" // Sphere
using namespace std;
int main()
{
cout << "Enter a sphere's radius and density: ";
Sphere aSphere;
aSphere.readRadiusAndDensity(cin);
cout << "The sphere's weight is "
<< aSphere.getWeight() << endl;
}
-------------------
Sample run:
Enter a sphere's radius and density: 6.5 14.6
The sphere's weight is 16795
|