gwiz_kid - 1 year ago 43

C Question

The program runs but I can't figure out why the function within the third

else if statement doesn't return an accurate value. Thank you for the help in

advance.

`finaltemp = newtemp(t, choice);`

printf("\nThe converted temperature is: %f", finaltemp);

return(0);

}

double newtemp(double a, double b)

{

double result;

if (b==1)

{

result = (a-(273.15));

}

if (b==2)

{

result = (a+(273.15));

}

if (b==3)

{

result = (((5/9)*(a))-32);

}

if (b==4)

{

result = (((9/5)*(a))+32);

}

if (b==5)

{

result = (((9/5)*(a))-459.67);

}

if (b==6)

{

result = ((a+459.67)*(9/5));

}

return(result);

}

Answer Source

You're performing integer division, not floating point division.

The expression `(5/9)`

divides two `int`

values, so the result is an `int`

, specifically 0. You need to use floating point constants to force floating point division.

```
if (b==3)
{
result = (((5.0/9.0)*(a))-32);
}
if (b==4)
{
result = (((9.0/5.0)*(a))+32);
}
if (b==5)
{
result = (((9.0/5.0)*(a))-459.67);
}
if (b==6)
{
result = ((a+459.67)*(9.0/5.0));
}
```