Question

1.- i need help with my code because it appears me

"main.cpp:77:7: error: expected unqualified-id before ‘else’
       else (s ==  't' || s == 'T' || s == '3')
       ^~~~"

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;

int main()
{
double l1, l2, bl, h, d, l, p, a, h1, h2, el, ia,sb,sh,P,A,oa,pc ;
double ap,pp,shp,cl,bsp,iap,blp,elp,o;
char s;
double const pi = 3.14159265;

cout <<setfill('*')<<setw(36)<<'*'<<endl;
cout <<setw(1)<<'*'<<" Rebel Alliance Computation Support "<<endl;
cout <<setw(1)<<'*'<<" Star area calculator "<<endl;
cout <<setfill('*')<<setw(36)<<'*'<<endl;
cout <<endl;
  
cout<< "(d/D/2) - Double Star Polygon " <<endl;
cout<< "(t/T/3) - Three Star Polygon " <<endl;
cout<< "(p/P) - Polygram Polygon " <<endl;
cout<< "(q/Q) - Quit "<< endl;
cout<<endl;
  
cout<<"Your selection"<<endl;
cin>>s;
cout<<endl;
  
if (s == 'd' || s == 'D' || s == '2')
{
cout<< "Double Star Polygon Calculator" <<endl;
cout<< setfill('-')<<setw(30)<<'-'<<endl;
cout<< endl;
}
cout<<" Length Long Valid range [1.00 < Length long < 236.00] "<<endl;
cout<<" Length Long: "<<endl;
cin>> l1;
cout<< endl;
  
cout<<" Length Short Valid range [1.00 < Length short < 118.00]"<<endl;
cout<<" Length short: "<<endl;
cin>> l2;
cout<< endl;
  
cout<<" Base Length Valid range [1.00 < Base short < 29.50] "<<endl;
cout<<" Base length: "<<endl;
cin>> bl;
cout<<setfill('-')<<setw(30)<<'-'<<endl;
  
if (l1 < 1.00 || l1 > 236.00|| l2 < 1.00 || l2 > 118.00 || bl < 1.00 || bl > 29.50)
{
cout<<"Invalid Numbers"<<endl;
}
  
else
{
cout<<" Calculations for a Double Star Polygon "<<endl;
cout<<" Base Length: " << bl <<endl;
cout<<" Length Long: " << l1 <<endl;
cout<<" Length Short:" << l2 <<endl;
cout<< setfill('-')<<setw(30)<<'-'<<endl;
cout<< endl;
  
h1 = sqrt(pow(l1, 2.00) - pow(bl, 2.0) / 4.00);
h2 = sqrt((pow(l2, 2.00)) - (pow(bl, 2.0) / 4.00));
d = 2.00 * h1 + bl * (1.00 + sqrt(2.00));
p = 8.00 * (l2 + l1);
a = 2.00 * bl * (bl * (1.00 + sqrt(2.00)) + (h1 + h2));
  
cout<<" Height Long: "<< h1 << endl;
cout<<" Height Short:"<< h2 << endl;
cout<<" Diameter : " << d << endl;
cout<<" Perimeter: " << p << endl;
cout<<" Area: " << a << endl;
}
}
else (s == 't' || s == 'T' || s == '3')
{
cout<<" Threestar Polygon Calculator "<<endl;
cout<<setfill('-')<<setw(30)<<'-'<<endl;
cout<< endl;
  
cout<<" Edge Length Valid range [1.00 < edge length < 132.00]"<< endl;
cout<<" Edge Length: ";
cin>> el;
cout<< endl;
  
cout<<" Inner Angle (degrees) Valid range [0.00 < edge legnth < 60.00]"<< endl;
cout<<" Inner angle (degrees): ";
cin>> ia;
cout<< endl;
cout<<setfill('-')<<setw(30)<<'-'<<endl;
  
if (el < 1.00 || el > 132.00 || ia < 0.00 || ia > 60.00)
{
cout<<" Invalid number "<<endl;
}
  
else
{
cout<<" Calculations for a Threestar Polygon "<<endl;
cout<<" Edge Length: " << el <<endl;
cout<<" Outer angle: " << 120.00 + ia <<endl;
cout<<" Inner angle: " << ia <<endl;
cout<<setfill('-')<<setw(30)<<'-'<<endl;
  
sb = sqrt((2.00 * pow(el, 2.00)) * (1.00 - cos(ia * (pi / 180.00))));
sh = sqrt((4.00 * pow(el, 2.00) - pow(sb, 2.00)) / 4.00);
cl = sqrt(2.00 * pow(el, 2.00) * (1.00 - cos ((120.00+ia) * (pi / 180.00))));
h = (sqrt(3.00) / (2) * cl);
P = 6.00 * el;
A = (3.00 / 2.00) * sh * sb + (sqrt(3.00) / 4.00) * pow(sb, 2.00);
  
cout<< "Spike base: " << sb <<endl;
cout<< "Spike height: " << sh <<endl;
cout<< "Chord length: " << cl <<endl;
cout<< "Height: " << h <<endl;
cout<< "Perimeter: " << P <<endl;
cout<< "Area: " << A <<endl;
}
  
}
else if (s == 'p' || s == 'P'){

cout<<"Polygram Calculator"<<endl;
cout<<setfill('-')<<setw(30)<<'-'<<endl;
cout<< endl;

cout<<" Point Count Valid range [3.00 < point count < 100.00]"<< endl;
cout<<" Point count: ";
cin>> pc;
cout<< endl;
  
cout<<" Edge Length Valid range [1.00 < edge length < 132.00]"<<endl;
cout<<" Edge Length: ";
cin>> elp;
cout<< endl;
  
cout<<" Outer Angle Valid range [0.00 < outer angle < 60.00]"<<endl;
cout<<" Outer angle: ";
cin>> oa;
cout<< endl;
cout<<setfill('-')<<setw(30)<<'-'<<endl;
  
if (pc < 3.00 || pc > 100.00 || elp < 1.00 || elp > 132.00 || oa < 1.00 || bl > 60.00)
{
cout<<" Error - invalid entry "<<endl;
cout<endl;
}

else
{
cout<< "Calculations for Polygram" <<endl;
cout<< "Point count: " << pc <<endl;
cout<< "Edge Length: " << elp <<endl;
cout<< "Outer angle: " << oa <<endl;
cout<<setfill('-')<<setw(30)<<'-'<<endl;
  
iap = oa - 360.00 / pc;
blp = sqrt(2.00 * pow(elp, 2.00) * (1.00 - cos(iap * (pi / 180.00))));
shp = sqrt(((4 * pow(elp, 2.00)) - pow(bsp, 2.00)) / 4.00);
pp = 2 * pc * elp;
ap = (pc * pow(bsp, 2.00)) / (4 * tan(pi/pc)) + (pc * shp*(bsp/2));
  
cout<<" Inner angle: "<< iap <<endl;
cout<<" Base length: "<< blp <<endl;
cout<<" Chord length:"<<endl;
cout<<" Spike Hieght:"<< shp <<endl;
cout<<" Perimeter: " << pp <<endl;
cout<<" Area: " << ap <<endl;
  
}
}
else
{
cout<<"Error - invalid entry"<<endl;
cout<<endl;
}
  
cout <<" Thank you for using Rebel Alliance Computational Support "<<endl;
cout <<" May the Force be with you ! "<<endl;
cout <<" * "<<endl;
cout <<" * *** * "<<endl;
cout <<" * * * * * "<<endl;
cout <<" * ** * "<<endl;
cout <<" ** * ** "<<endl;
cout <<" *** *** *** "<<endl;
cout <<" **** *** **** "<<endl;
cout <<" ***** *** ****** "<<endl;
cout <<" ********************** "<<endl;
cout <<" ******************** "<<endl;
cout <<" ****************** "<<endl;
cout <<" ************** "<<endl;
cout<<endl;
  

return 0;
}

Answer 1

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;

int main()
{
   double l1, l2, bl, h, d, l, p, a, h1, h2, el, ia,sb,sh,P,A,oa,pc ;
   double ap,pp,shp,cl,bsp,iap,blp,elp,o;
   char s;
   double const pi = 3.14159265;
  
   cout <<setfill('*')<<setw(36)<<'*'<<endl;
   cout <<setw(1)<<'*'<<" Rebel Alliance Computation Support "<<endl;
   cout <<setw(1)<<'*'<<" Star area calculator "<<endl;
   cout <<setfill('*')<<setw(36)<<'*'<<endl;
   cout <<endl;
  
   cout<< "(d/D/2) - Double Star Polygon " <<endl;
   cout<< "(t/T/3) - Three Star Polygon " <<endl;
   cout<< "(p/P) - Polygram Polygon " <<endl;
   cout<< "(q/Q) - Quit "<< endl;
   cout<<endl;
  
   cout<<"Your selection"<<endl;
   cin>>s;
   cout<<endl;
  
   if (s == 'd' || s == 'D' || s == '2')
   {
       cout<< "Double Star Polygon Calculator" <<endl;
       cout<< setfill('-')<<setw(30)<<'-'<<endl;
       cout<< endl;
       cout<<" Length Long Valid range [1.00 < Length long < 236.00] "<<endl;
       cout<<" Length Long: "<<endl;
       cin>> l1;
       cout<< endl;
      
       cout<<" Length Short Valid range [1.00 < Length short < 118.00]"<<endl;
       cout<<" Length short: "<<endl;
       cin>> l2;
       cout<< endl;
      
       cout<<" Base Length Valid range [1.00 < Base short < 29.50] "<<endl;
       cout<<" Base length: "<<endl;
       cin>> bl;
       cout<<setfill('-')<<setw(30)<<'-'<<endl;

       if (l1 < 1.00 || l1 > 236.00|| l2 < 1.00 || l2 > 118.00 || bl < 1.00 || bl > 29.50)
       {
           cout<<"Invalid Numbers"<<endl;
       }      
       else
       {
           cout<<" Calculations for a Double Star Polygon "<<endl;
           cout<<" Base Length: " << bl <<endl;
           cout<<" Length Long: " << l1 <<endl;
           cout<<" Length Short:" << l2 <<endl;
           cout<< setfill('-')<<setw(30)<<'-'<<endl;
           cout<< endl;
          
           h1 = sqrt(pow(l1, 2.00) - pow(bl, 2.0) / 4.00);
           h2 = sqrt((pow(l2, 2.00)) - (pow(bl, 2.0) / 4.00));
           d = 2.00 * h1 + bl * (1.00 + sqrt(2.00));
           p = 8.00 * (l2 + l1);
           a = 2.00 * bl * (bl * (1.00 + sqrt(2.00)) + (h1 + h2));
          
           cout<<" Height Long: "<< h1 << endl;
           cout<<" Height Short:"<< h2 << endl;
           cout<<" Diameter : " << d << endl;
           cout<<" Perimeter: " << p << endl;
           cout<<" Area: " << a << endl;
       }
  
   }else if(s == 't' || s == 'T' || s == '3')
   {
       cout<<" Threestar Polygon Calculator "<<endl;
       cout<<setfill('-')<<setw(30)<<'-'<<endl;
       cout<< endl;
      
       cout<<" Edge Length Valid range [1.00 < edge length < 132.00]"<< endl;
       cout<<" Edge Length: ";
       cin>> el;
       cout<< endl;
      
       cout<<" Inner Angle (degrees) Valid range [0.00 < edge legnth < 60.00]"<< endl;
       cout<<" Inner angle (degrees): ";
       cin>> ia;
       cout<< endl;
       cout<<setfill('-')<<setw(30)<<'-'<<endl;
      
       if (el < 1.00 || el > 132.00 || ia < 0.00 || ia > 60.00)
       {
           cout<<" Invalid number "<<endl;
       }
       else
       {
           cout<<" Calculations for a Threestar Polygon "<<endl;
           cout<<" Edge Length: " << el <<endl;
           cout<<" Outer angle: " << 120.00 + ia <<endl;
           cout<<" Inner angle: " << ia <<endl;
           cout<<setfill('-')<<setw(30)<<'-'<<endl;
          
           sb = sqrt((2.00 * pow(el, 2.00)) * (1.00 - cos(ia * (pi / 180.00))));
           sh = sqrt((4.00 * pow(el, 2.00) - pow(sb, 2.00)) / 4.00);
           cl = sqrt(2.00 * pow(el, 2.00) * (1.00 - cos ((120.00+ia) * (pi / 180.00))));
           h = (sqrt(3.00) / (2) * cl);
           P = 6.00 * el;
           A = (3.00 / 2.00) * sh * sb + (sqrt(3.00) / 4.00) * pow(sb, 2.00);
          
           cout<< "Spike base: " << sb <<endl;
           cout<< "Spike height: " << sh <<endl;
           cout<< "Chord length: " << cl <<endl;
           cout<< "Height: " << h <<endl;
           cout<< "Perimeter: " << P <<endl;
           cout<< "Area: " << A <<endl;
       }
  
   }else if (s == 'p' || s == 'P'){
  
       cout<<"Polygram Calculator"<<endl;
       cout<<setfill('-')<<setw(30)<<'-'<<endl;
       cout<< endl;
      
       cout<<" Point Count Valid range [3.00 < point count < 100.00]"<< endl;
       cout<<" Point count: ";
       cin>> pc;
       cout<< endl;
      
       cout<<" Edge Length Valid range [1.00 < edge length < 132.00]"<<endl;
       cout<<" Edge Length: ";
       cin>> elp;
       cout<< endl;
      
       cout<<" Outer Angle Valid range [0.00 < outer angle < 60.00]"<<endl;
       cout<<" Outer angle: ";
       cin>> oa;
       cout<< endl;
       cout<<setfill('-')<<setw(30)<<'-'<<endl;
      
       if (pc < 3.00 || pc > 100.00 || elp < 1.00 || elp > 132.00 || oa < 1.00 || bl > 60.00)
       {
           cout<<" Error - invalid entry "<<endl;
           cout<<endl;
       }
      
       else
       {
           cout<< "Calculations for Polygram" <<endl;
           cout<< "Point count: " << pc <<endl;
           cout<< "Edge Length: " << elp <<endl;
           cout<< "Outer angle: " << oa <<endl;
           cout<<setfill('-')<<setw(30)<<'-'<<endl;
          
           iap = oa - 360.00 / pc;
           blp = sqrt(2.00 * pow(elp, 2.00) * (1.00 - cos(iap * (pi / 180.00))));
           shp = sqrt(((4 * pow(elp, 2.00)) - pow(bsp, 2.00)) / 4.00);
           pp = 2 * pc * elp;
           ap = (pc * pow(bsp, 2.00)) / (4 * tan(pi/pc)) + (pc * shp*(bsp/2));
          
           cout<<" Inner angle: "<< iap <<endl;
           cout<<" Base length: "<< blp <<endl;
           cout<<" Chord length:"<<endl;
           cout<<" Spike Hieght:"<< shp <<endl;
           cout<<" Perimeter: " << pp <<endl;
           cout<<" Area: " << ap <<endl;
      
       }
   }
   else
   {
       cout<<"Error - invalid entry"<<endl;
       cout<<endl;
   }
  
   cout <<" Thank you for using Rebel Alliance Computational Support "<<endl;
   cout <<" May the Force be with you ! "<<endl;
   cout <<" * "<<endl;
   cout <<" * *** * "<<endl;
   cout <<" * * * * * "<<endl;
   cout <<" * ** * "<<endl;
   cout <<" ** * ** "<<endl;
   cout <<" *** *** *** "<<endl;
   cout <<" **** *** **** "<<endl;
   cout <<" ***** *** ****** "<<endl;
   cout <<" ********************** "<<endl;
   cout <<" ******************** "<<endl;
   cout <<" ****************** "<<endl;
   cout <<" ************** "<<endl;
   cout<<endl;
   return 0;
}

/* OUTPUT */

/* PLEASE UPVOTE */