Using loops

[CMinusMinusPlus]

Im a new coder when it comes to loops. i have worked with GML but c++ is more unforgiving. I am trying to get a loop that goes back to the beggining after user input of y for yes or n for no.

  #include <iostream>
using namespace std;

/*
  Name: Money conversion 
  Author:Zachary Horton 
  Date: 12/2/14 13:16
  Description: Convert US 
  dollars, to Pesos or 
  Canadian dollars
*/

 int main()
  {
           start:
     
   int U;
   
   cout << "Please enter US dollar amount: $";
     cin >> U;
   
   double P = 14.11;
   
   double C = 1.14;
   
   (P *= U);
   (C *= U);
   
   cout << "That will get you:  " << endl;
   
   cout << "" << endl;
   
   cout << "MXN:  " << P << endl;
   
   cout << "" << endl;
   
   cout << "CAD:  " << C << endl;
   
   cout << "" << endl;
   
    
//here lies the problem

   char A;
   
   cout << "New amount?";
     
   cin >> A;   
   
   
  
   
   system ("PAUSE");

   return 0;
  }

[Jacobhaha]

I am trying to get a loop that goes back to the beggining after user input of y for yes or n for no.

I assume it is here:

int A;
   
cout << "New amount?";
   
cin >> A;

First of all, you declared a variable of type int and expect a y or n? If input is wrong program will become defect if you can say it like that.

[CMinusMinusPlus]

i assume you mean put char instead of int?

[Jacobhaha]

Correct, and i advise you to move all your variable declarations out of the loop.

[CMinusMinusPlus]

i need the syntax for a loop

i was trying IF/Else but couldnt get it to work

[Jacobhaha]

This is an example of a do-while loop.

do {
// Code goes here
}while(A != 'n');

[CMinusMinusPlus]

is this correct?

int main()

do {
  {
           start:
     
   int U;
   
   cout << "Please enter US dollar amount: $";
     cin >> U;
   
   double P = 14.11;
   
   double C = 1.14;
   
   (P *= U);
   (C *= U);
   
   cout << "That will get you:  " << endl;
   
   cout << "" << endl;
   
   cout << "MXN:  " << P << endl;
   
   cout << "" << endl;
   
   cout << "CAD:  " << C << endl;
   
   cout << "" << endl;
   
    
//here lies the problem

   char A;
   
   cout << "New amount?";
     
   cin >> A;   
   

}while(A != 'y'); 

[Jacobhaha]

Almost, your A variable is out of scope, move it out of the loop, and while you're at it move the other variable declarations out as well.

[CMinusMinusPlus]

Variables are out of loop. im assuming because it would keep re-declaring them and overload the buffer. I just need to figure out how to make it return to start on yes and terminate on n.

int main()

double P = 14.11;
   
double C = 1.14;
   
int U;

char A;

{  

do{ 
  
       
   cout << "Please enter US dollar amount: $";
     cin >> U;
   
   
   (P *= U);
   (C *= U);
   
   cout << "That will get you:  " << endl;
   
   cout << "" << endl;
   
   cout << "MXN:  " << P << endl;
   
   cout << "" << endl;
   
   cout << "CAD:  " << C << endl;
   
   cout << "" << endl;
   
   cout << "New amount?";
     
   cin >> A;   
   
   }

   while(A != 'y'); 

[Jacobhaha]

You need a open curly brace right after int main() either on line 1 or 2 or atleast before any code starts.
Move line 11 to line 2.
And you need a closing curly brace at the end of the program to end the main function as well.

[Jacobhaha]

This is what it should look like:

#include <iostream>
using namespace std;

int main()
{
double P = 14.11;
   
double C = 1.14;
   
int U;

char A;

 

do{ 
  
       
   cout << "Please enter US dollar amount: $";
     cin >> U;
   
   
   (P *= U);
   (C *= U);
   
   cout << "That will get you:  " << endl;
   
   cout << "" << endl;
   
   cout << "MXN:  " << P << endl;
   
   cout << "" << endl;
   
   cout << "CAD:  " << C << endl;
   
   cout << "" << endl;
   
   cout << "New amount?";
     
   cin >> A;   
   
   }while(A != 'n'); 
}

while(A != 'n');

means run the loop as long as A is not equal to(!=) 'n'.
So as long as variable A is not equal to n the program will run

[CMinusMinusPlus]

does it not need return 0 or system pause?

[CMinusMinusPlus]

thanks for the help solved majority problem. was confused on "Return 0" and "System ("PAUSE")' because thats how i was trained.

[Jacobhaha]

It does actually need it, it's good practise to use it everytime, i just forgot.

[CMinusMinusPlus]

so after while? or include in the loop?

[Jacobhaha]

At the bottom of the program on the line before the terminating close curly brace.
Move Line 43 to 44 and put return 0; on line 43.
That is how i would do it.

[CMinusMinusPlus]

Thank you again. I usually am good with this stuff and enjoy coding. i like to have conformation i am doing stuff right and you helped me on that so thank you for the third time.

[Jacobhaha]

No problem