# Some help in C++ requested (new to programming)

• 11-06-2010
lietuvis416
Some help in C++ requested (new to programming)
I'm trying to write a program that converts Celsius to Fahrenheit and the reverse. I just started learning C++ so this might not be the most efficient way to write this. I'm experiencing errors at the "else if" and "while" parts (line 24 and 32). Any tips?

Code:

Code:

``` #include <iostream> #include <cmath> using namespace std; int whichconversion; char continue_ques; double Fahrenheit; double Celsius; double newFtemp; double newCtemp; void FtoC(double n); void CtoF(double n); int main() {         do {         cout << "Choose what you would like to : " << endl;         cout << "1) Convert F to C" << endl;         cout << "2) Convert C to F" << endl;         cin >> whichconversion;         if( whichconversion == 1 ); {                 cout << "Enter the F temp you want to convert: " << endl;                 cin >> Fahrenheit;                 FtoC(Fahrenheit);         }else if( whichconversion == 2); {                 cout << "Enter the C temp you want to convert: " << endl;                 cin >> Celsius;                 CtoF(Celsius);         }         cout << "Would you like to conduct another conversion? (Yes/No)" << endl;         cin >> continue_ques;         }         while ( continue_ques == Yes ); } void FtoC(double n){         newCtemp = 0.555555555555556*Fahrenheit-32.0         cout << Fahrenheit << "Fahrenheit is equal to " << newCtemp << "Celsius" << endl; } void CtoF(double n){         newFtemp = 1.8*(Celsius+32.0)         cout << Celsius << "Celsius is equal to " << newFtemp << "Fahrenheit" << endl; }```
• 11-06-2010
Salem
> if( whichconversion == 1 );
Yeah, those trailing ; are bad news.
• 11-06-2010
ychen42
if else statements should not end with ; cause thatll just end that statement

so it should be like this:
Code:

```if( whichconversion == 1 ) {                 cout << "Enter the F temp you want to convert: " << endl;                 cin >> Fahrenheit;                 FtoC(Fahrenheit);         }else if( whichconversion == 2) {                 cout << "Enter the C temp you want to convert: " << endl;                 cin >> Celsius;                 CtoF(Celsius);         }```
Code:

```void FtoC(double n){         newCtemp = 0.555555555555556*Fahrenheit-32.0         cout << Fahrenheit << "Fahrenheit is equal to " << newCtemp << "Celsius" << endl; } void CtoF(double n){         newFtemp = 1.8*(Celsius+32.0)         cout << Celsius << "Celsius is equal to " << newFtemp << "Fahrenheit" << endl; }```
in here u r MISSING ; in the temp variables
• 11-06-2010
Elysia
You might want to understand the concepts of scopes and statements. Statements ends with a semicolon, but keywords that introduce a scope does not (for example, if, do, while).
Also, a function can return a value, like:

Code:

```double CtoF(double n) {         return 1.8*(Celsius+32.0); } double x = CToF(10.0);```
This way, you can move all your variables inside main. Global variables are considered bad.