Best way to conditionally branch this?

Code:

---

#include <iostream>

using namespace std;

int main()
{cout<< "Welcome to RollCast's Classic Salmon Fly Proportion Calculator!"<<endl;
cout<< "Please enter the gape of your hook in mm."<<endl;
int gape;
cin>> gape;
cout<< "Your hook gape ="; cout<< (gape); cout<< "mm"<<endl;
cout<< "Please select which tyers proportions you wish to use"<<endl;
cout<< "A: Kelson \nB: Cohen \nC: Alcott \nD: Carne \nE: Guidry \nF: Inman \nG: Boyer \nH: Ostoj \nI: Gotzmer"<<endl;
cout<< "Please input the letter for which proportion you wish to use"<<endl;
char tyer;
cin>> tyer;
}

---

Sorry if this is really simple but I'm only learning C++ and can't figure out this problem.

The idea for this project is to make a program that will take an integer input and then output a set of integers based on which tyer's proportions you choose to use.

However I wanted to try and make the code as foolproof as possible so I don't have to rely on the user checking their inputs?

Basically I want to take the users input, a char and then dependant on what character they input then use a certain scaling factor on their integer input.

Thanks
AL

I tried doing this with the switch function but I keep on getting errors?

Code:

---

#include <iostream>

using namespace std;

int main()
{cout<< "Welcome to RollCast's Classic Salmon Fly Proportion Calculator!"<<endl;
cout<< "Please enter the gape of your hook in mm."<<endl;
int gape;
cin>> gape;
cout<< "Your hook gape ="; cout<< (gape); cout<< "mm"<<endl;
cout<< "Please select which tyers proportions you wish to use"<<endl;
cout<< "1: Kelson \n2: Cohen \n3: Alcott \n4: Carne \n5: Guidry \n6: Inman \n7: Boyer \n8: Ostoj \n9: Gotzmer"<<endl;
cout<< "Please input the number for which proportion you wish to use"<<endl;
int tyer;
cin>> tyer;
switch (tyer)
  {case 1:
      float dtl =1.8;
      float has =0.8;
      float dbb =0.7;
    break;
  case 2:
      float dtl =2;
      float has =0.875;
      float dbb =0.5;
    break;
    case 3:
      float dtl =1.4;
      float has =0.7;
      float dbb =0.3;
    break;
  case 4:
      float dtl =1.8;
      float has =1;
      float dbb =0.44;
    break;
    case 5:
      float dtl =1.88;
      float has =1.1;
      float dbb =0.75;
    break;
  case 6:
      float dtl =1.9;
      float has =0.81;
      float dbb =0.69;
    break;
    case 7:
      float dtl =1.78;
      float has =0.5;
      float dbb =0.83;
    break;
  case 8:
      float dtl =2;
      float has =0.78;
      float dbb =0.78;
    break;
    case 9:
      float dtl =1.69;
      float has =0.58;
      float dbb =0.53;
    break;
    default:
    cout << "Not a valid option" << endl;
    }

    cout<< (dtl)<<endl;
    cout<< (has)<<endl;
    cout<< (dbb)<<endl;
}

---

For one, declare your floats dtl, has, and dbb above the switch block.

As in :

Code:

---

float dtl;
float has;
float dbb;

switch()
{
    case 1:
        dtl = xx.x;
        has = xx.x;
        dbb = xx.x;
    break;
}

---

Code:

---

#include <iostream>

using namespace std;

int main()
{cout<< "Welcome to RollCast's Classic Salmon Fly Proportion Calculator!"<<endl;
cout<< "Please enter the gape of your hook in mm."<<endl;
int gape;
cin>> gape;
cout<< "Your hook gape ="; cout<< (gape); cout<< "mm"<<endl;
cout<< "Please select which tyers proportions you wish to use"<<endl;
cout<< "1: Kelson \n2: Cohen \n3: Alcott \n4: Carne \n5: Guidry \n6: Inman \n7: Boyer \n8: Ostoj \n9: Gotzmer"<<endl;
cout<< "Please input the number for which proportion you wish to use"<<endl;
int tyer;
cin>> tyer;
float dtl;
float has;
float dbb;
switch (tyer)
  {case 1:
      dtl =1.8;
      has =0.8;
      dbb =0.7;
    break;
  case 2:
      dtl =2;
      has =0.875;
      dbb =0.5;
    break;
    case 3:
      dtl =1.4;
      has =0.7;
      dbb =0.3;
    break;
  case 4:
      dtl =1.8;
      has =1;
      dbb =0.44;
    break;
    case 5:
      dtl =1.88;
      has =1.1;
      dbb =0.75;
    break;
  case 6:
      dtl =1.9;
      has =0.81;
      dbb =0.69;
    break;
    case 7:
      dtl =1.78;
      has =0.5;
      dbb =0.83;
    break;
  case 8:
      dtl =2;
      has =0.78;
      dbb =0.78;
    break;
    case 9:
      dtl =1.69;
      has =0.58;
      dbb =0.53;
    break;
    default:
    cout << "Not a valid option" << endl;
    }
    cout<< "Diagonal tail length ="; cout<< gape*dtl; cout<< "mm"<<endl;
    cout<< "Height above shank ="; cout<< gape*has; cout<< "mm"<<endl;
    cout<< "Distance behind bend ="; cout<< gape*dbb; cout<< "mm"<<endl;

    cout<< "Thanks for testing, RollCast \n Press ANY KEY to continue";

  return 0;
  }

---

This is what I have so far, however when I debug it, the console window disappears when it gets the switch part just after I declare the 3 floats

For two, don't put variables in brackets when outputting their value.

Your code might say "Press ANY KEY to continue" but it doesn't actually wait for a key. Check the FAQs about that.

In the switch for each case use a char so example would be case 'a':

Code:

---

#include <iostream>

using namespace std;

int main()
{cout<< "Welcome to RollCast's Classic Salmon Fly Proportion Calculator!"<<endl;
cout<< "Please enter the gape of your hook in mm."<<endl;
int gape;
cin>> gape;
cout<< "Your hook gape ="; cout<< (gape); cout<< "mm"<<endl;
cout<< "Please select which tyers proportions you wish to use"<<endl;
cout<< "a: Kelson \nb: Cohen \nc: Alcott \nd: Carne \ne: Guidry \nf: Inman \ng: Boyer \nh: Ostoj \ni: Gotzmer"<<endl;
cout<< "Please input the number for which proportion you wish to use"<<endl;
char tyer;
cin>> tyer;
float dtl;
float has;
float dbb;
switch (tyer)
  {
      case 'a':
      dtl =1.8;
      has =0.8;
      dbb =0.7;
    break;
  case 'b':
      dtl =2;
      has =0.875;
      dbb =0.5;
    break;
    case 'c':
      dtl =1.4;
      has =0.7;
      dbb =0.3;
    break;
  case 'd':
      dtl =1.8;
      has =1;
      dbb =0.44;
    break;
    case 'e':
      dtl =1.88;
      has =1.1;
      dbb =0.75;
    break;
  case 'f':
      dtl =1.9;
      has =0.81;
      dbb =0.69;
    break;
    case 'g':
      dtl =1.78;
      has =0.5;
      dbb =0.83;
    break;
  case 'h':
      dtl =2;
      has =0.78;
      dbb =0.78;
    break;
    case 'i':
      dtl =1.69;
      has =0.58;
      dbb =0.53;
    break;
    default:
    cout << "Not a valid option" << endl;
    }
    cout<< "Diagonal tail length ="; cout<< gape*dtl; cout<< "mm"<<endl;
    cout<< "Height above shank ="; cout<< gape*has; cout<< "mm"<<endl;
    cout<< "Distance behind bend ="; cout<< gape*dbb; cout<< "mm"<<endl;

    cout<< "Thanks for testing, RollCast \n Press ANY KEY to continue";

  return 0;
  }

---