if else statements

[socondc22]

if i want to have a selection that uses letters such as m for metric, e for english, or q for quit to select which part of my if else statement i want to run... how would i set that up... i want to say that it would be....

cin>> letter;  
if(letter == 'm')

[Banfa]

That looks about right, or you may wish to consider using a switch statement if there are going to be a lot of options.

[socondc22]

That looks about right, or you may wish to consider using a switch statement if there are going to be a lot of options.

I only have those three choices. so i figured i could do if, then if else, then if else again and it would be fine.... also im getting an error because im using if outside of my int main() for void functions... am i not allowed to do that?

[socondc22]

Can someone tell me why i can't do this and help me out with what i should do...

if(letter == 'm' || letter == 'M')
 
{void get_numbers(double& input1, double& input2)
 {
  using namespace std;
  cout<< "Enter first number as meters and second as centimeters.\n";
  cin>> input1
     >> input2;
  input1 = input1 * 3.2808399;
  input2 = input2 * .393700787;
 }
 
 void show_results(double output1, double output2)
 {
  using namespace std;
  cout<< "Feet: "<<output1<<" Inches: "<<output2<<endl;
 }
}
 

[RRick]

Are you saying you have an if-else conditional outside of any function? That won't work. They need to be inside a function or method.

Perhaps a code snippet would help.

[socondc22]

Are you saying you have an if-else conditional outside of any function? That won't work. They need to be inside a function or method.

Perhaps a code snippet would help.

int main()
{
  char letter;
 
  cout<<"Metric to English and English to Metric converter.\n"
      <<"For Metric to English type m, for Enlish to Metric type E, Type q to quit.\n";
  cin>>letter;
 
     double first_num, second_num;
 
     get_numbers(first_num, second_num);
     show_results(first_num, second_num);
     return 0;
}
 

This is my main part... im trying to run three different times... one being running from metric to english... or english to metric... or just quit.... and i figured i could use more void functions for when i go english to metric....

[weaknessforcats]

This is my main part... im trying to run three different times... one being running from metric to english... or english to metric... or just quit.... and i figured i could use more void functions for when i go english to metric....

Have you considered that you never use the letter? So how do your functions know whether it is English or Metric?

You might pass along the letter as a third argument.