program converting Celsius to Fahrenheit

[zelmila19]

Hi
I was doing this program on Visual Studio 2005 where the program converts C to F and vise versa but after debugging it, it doesnt give the expected result. Could someone tell me what is wrong with my code???


#include <iostream>
#include <iomanip>

using namespace::std;
using std::fixed;

int main()
{
int conversionType = 0;
double temp = 0.0;
double result = 0.0;

cout << "Enter -1 (F to C) or 2 (C to F): ";
cin >> conversionType;
cout << "Enter temperature: ";
cin >> temp;

if (conversionType == '-1')
{
result = (temp - 32) * 5 / 9 ;
}
else if (conversionType == '2')
{
result = temp * 9/5 + 32;

} //end if

cout << "Result: " << result << endl;

return 0;
} //end of main function

[Ganon11]

Note that in C++ (and most programming languages), integer division is different than floating point division. Only integers are returned, so 9/5 is 1, and 5/9 is 0. You should replace those with 9.0/5.0 and 5.0/9.0, respectively.

[vhm]

Hi
I was doing this program on Visual Studio 2005 where the program converts C to F and vise versa but after debugging it, it doesnt give the expected result. Could someone tell me what is wrong with my code???


#include <iostream>
#include <iomanip>

using namespace::std;
using std::fixed;

int main()
{
int conversionType = 0;
double temp = 0.0;
double result = 0.0;

cout << "Enter -1 (F to C) or 2 (C to F): ";
cin >> conversionType;
cout << "Enter temperature: ";
cin >> temp;

if (conversionType == '-1')
{
result = ((temp - 32) * 5) / 9 ;
}
else if (conversionType == '2')
{
result = ((temp * 9) /5) + 32;

} //end if

cout << "Result: " << result << endl;

return 0;
} //end of main function

Thats right Gagnon. Here you have something a litle more polished but very faithfull to the original.


<Full code solution removed>

[Banfa]

vhm, please note we do not allow the posting of full code solutions on this site for a number of reasons.

I suggest you read our Posting Guidelines

Banfa
Administrator

[SpecialKay]

If i were you, i would use
C = F - 32 / 1.8
and
F = C + 32 * 1.8

solves all the problems.

[phiefer3]

If i were you, i would use
C = F - 32 / 1.8
and
F = C + 32 * 1.8

solves all the problems.

Except that those are actually wrong. They should be:

C = (F - 32) / 1.8
The parentheses are important, other wise it divides 32 by 1.8 and subtracts that from F, and the second one should be

F = C * 1.8 + 32