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# include <iostream>
# include <cstdlib>
using namespace std;
int choice;
// You use a large screen of infos ,That's why I think you should introduce a menu function to call It after every operation .
void menu();
int main()
{
// It is a lot better to declare your variables as a local ones ,because when your programs grow you'll find some troubles
double pounds = 0,// Initialisatin is good
kilograms = 0,
feet = 0,
metres = 0,
centimetres = 0,
inches = 0,
kilometres = 0,
miles = 0,
yards = 0,
EUR = 0,
USD = 0,
GBP = 0,
CNY = 0;
// We use do while if we want to excute at least once the stuff inside it,this is why your program goes right but one time,
// I think just while could do the job ,also you can keep your do while if you want to
// The problem is in the condutions of the do while loop you just say if the choice != 1 exit the loop ,
// for exemple when I choose the choice 1 the program will do the conversion pounds to kg ,the choice still 1 ,
// the loop says I will continue if the choice != 1,You know the rest..
while ( choice>=0&&choice<=21)
{
menu();
cin >> choice;
switch (choice)
{
case 1:
cout << "\nEnter the number of pounds: ";
cin >> pounds;
cout << "\n" << pounds << " lbs is " << pounds * 0.45 << " kg." << endl;
break;
case 2:
cout << "\nEnter the number of kilos: ";
cin >> kilograms;
cout << "\n" << kilograms << " kg is " << kilograms * 2.2 << " pounds." << endl;
break;
case 3:
cout << "\nEnter the number of feet: ";
cin >> feet;
cout << "\n" << feet << " ft is " << feet * 0.3 << " m." << endl;
break;
case 4:
cout << "\nEnter the number of meters: ";
cin >> metres;
cout << "\n" << metres << " m is " << metres * 3.2 << " ft." << endl;
break;
case 5:
cout << "\nEnter the number of inches: ";
cin >> inches;
cout << "\n" << inches << " inches is " << inches * 2.55 << " ft." << endl;
break;
case 6:
cout << "\nEnter the number of centimetres: ";
cin >> centimetres;
cout << "\n" << centimetres << " cm is " << centimetres * 0.4 << " inches." << endl;
break;
case 7:
cout << "\nEnter the number of miles: ";
cin >> miles;
cout << "\n" << miles << " miles is " << miles * 1.6 << " km." << endl;
break;
case 8:
cout << "\nEnter the number of kilometers: ";
cin >> kilometres;
cout << "\n" << kilometres << " km is " << kilometres * 0.62 << " miles." << endl;
break;
case 9:
cout << "\nEnter the number of yards: ";
cin >> yards;
cout << "\n" << yards << " yards is " << yards * 0.91 << " meters." << endl;
break;
case 10:
cout << "\nEnter the number of meters: ";
cin >> metres;
cout << "\n" << metres << " m is " << metres * 1.1 << " yards." << endl;
break;
case 11:
cout << "\nEnter the amount of EUR: ";
cin >> EUR;
cout << "\n" << EUR << " EUR is " << EUR * 1.26 << "USD. " << endl;
break;
case 12:
cout << "\nEnter the amount of USD: ";
cin >> USD;
cout << "\n" << USD << " USD is " << USD * 0.79 << " EUR." << endl;
break;
case 13:
cout << "\nEnter the amount of GBP: ";
cin >> GBP;
cout << "\n" << GBP << " GBP is " << GBP * 1.59 << " USD." << endl;
break;
case 14:
cout << "\nEnter the amount of USD: ";
cin >> USD;
cout << "\n" << USD << " USD is " << USD * 0.63 << " GBP." << endl;
break;
case 15:
cout << "\nEnter the amount of EUR: ";
cin >> EUR;
cout << "\n" << EUR << " EUR is " << EUR * 0.79 << " GBP." << endl;
break;
case 16:
cout << "\nEnter the amount of GBP: ";
cin >> GBP;
cout << "\n" << GBP << " GBP is " << GBP * 1.26 << " EUR." << endl;
break;
case 17:
cout << "\nEnter the amount of CNY: ";
cin >> CNY;
cout << "\n" << CNY << " CNY is " << CNY * 0.125 << " EUR." << endl;
break;
case 18:
cout << "\nEnter the amount of EUR: ";
cin >> EUR;
cout << "\n" << EUR << " EUR is " << EUR * 7.99 << " CNY." << endl;
break;
case 19:
cout << "\nEnter the amount of CNY: ";
cin >> CNY;
cout << "\n" << CNY << " CNY is " << CNY * 0.16 << " USD." << endl;
break;
case 20:
cout << "\nEnter the amount of USD: ";
cin >> USD;
cout << "\n" << USD << " USD is " << USD * 6.35 << " CNY." << endl;
break;
case 21:
choice = 22;// Or any number(>21 or <0)
break;
default:
cout << "\nPlease enter a valid choice.\n " << endl;
choice = 0;//If we dont do that the program will end if we enter for exp 33
}system("pause");system("cls");// To clear the screen for the next operation
}
// If you want to do one conversion operation ,well then you can keep what I just delete.
// although,your program seems perfectly fine and nice too
cout << "End of program " << endl;
system("pause");
return 0;
}
void menu()
{
cout << "Weight: \n" << endl;
cout << "Pounds --> Kilograms: type 1. " << endl;
cout << "Kilograms --> Pounds: type 2. " << endl;
cout << "\nDistance:\n" << endl;
cout << "Feet --> Metres: type 3. " << endl;
cout << "Metres --> Feet: type 4. " << endl;
cout << "Inches --> Centimetres: type 5. " << endl;
cout << "Centimetres --> Inches: type 6. " << endl;
cout << "Miles --> Kilometres: type 7." << endl;
cout << "Kilometres --> Miles: type 8." << endl;
cout << "Yards --> Metres: type 9." << endl;
cout << "Metres --> Yards: type 10." << endl;
cout << "\nCurrency:\n" << endl;
cout << "EUR --> USD: type 11." << endl;
cout << "USD --> EUR: type 12." << endl;
cout << "GBP --> USD: type 13." << endl;
cout << "USD --> GBP: type 14." << endl;
cout << "EUR --> GBP: type 15." << endl;
cout << "GBP --> EUR: type 16." << endl;
cout << "CNY --> EUR: type 17." << endl;
cout << "EUR --> CNY: type 18." << endl;
cout << "CNY --> USD: type 19." << endl;
cout << "USD --> CNY: type 20." << endl;
cout << "To quie : type 21." << endl << endl;
}
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