Answer / ss

Week5


using namespace std;

enum Planet {MERCURY, VENUS, EARTH, MARS,JUPITER,
SATURN, URANUS,NEPTUNE,
PLUTO};

string tolowerstr(string str);
Planet StrToPlanet(string str);
string PlanetToStr(Planet planet);
void readData(double&, Planet&);
double PlanetWeight(double, Planet);




int main()
{//for (Planet p=MERCURY; p<=PLUTO; p=Planet(p+1))
//cout<<PlanetToStr(p)<<endl;
Planet planet;
double weight;
char answer;
do{

cout<<"Enter your weight? "; cin>>w;
cout<<"Enter a planet name? ";cin>>str;
cout<<"Your weight on ";
<<" is "<<PlanetWeight(weight,
planet)<<" kg."<<endl;

cout<<"Press letter s to stop? ";
cin>>answer;

}while (answer!='s' && answer!='S');

return 0;

}//main




Planet StrToPlanet(string str)
{//converts the string str value to its corresponding
Planets value
string cstr=tolowerstr(str); //converts user typed planet
name into lowercase form
if (cstr=="mars")
return MARS;
else if (cstr=="mercury")
return MERCURY;
else if (cstr=="venus")
return VENUS;
else if (cstr=="jupiter")
return JUPITER;
else if (cstr=="neptone")
return NEPTUNE;
else if (cstr=="saturn")
return SATURN;
else if (cstr=="pluto")
return PLUTO;
else
{
if (cstr!="earth")
cout<<"Invalid planet name.\n";
return EARTH;}}//ConvertToPlanets

string tolowerstr(string str)
{



//converts every character in the string str to lowercase
form
for(int i=0; i!=str.length(); i++)
str[i]=tolower(str[i]);

return str;





}







string PlanetToStr(Planet planet)
{
switch (planet)
{
case EARTH: return "Earth";
case JUPITER: return "Jupiter";
case VENUS: return "Venus";
case MARS: return "Mars";
case MERCURY: return "Mercury";
case SATURN: return "Saturn";
case NEPTUNE: return "Neptune";
case PLUTO: return "Pluto";
case URANUS: return "Uranus";
default: return "Error";

}//switch

}//PlanetToStr
double PlanetWeight(double earthweight, Planet p)
{
switch(p)
{
case JUPITER: return 2.5374*earthweight;
case VENUS: return earthweight* 0.8975;
case MARS: return earthweight*0.3507;
case MERCURY: return earthweight*0.4155;
case SATURN: return earthweight*1.0677;
case NEPTUNE: return earthweight*1.1794;
case PLUTO: return earthweight*0.0899;
case URANUS: return earthweight*0.8947;
default: return earthweight;
}//switch
}//PlanetWeight
void readData(double &w, Planet &p){
string str;
cout<<"Enter your weight? "; cin>>w;
cout<<"Enter a planet name? ";cin>>str;
p=StrToPlanet(str);
}

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