Dev C++ Fahrenheit To Celsius Converter
Quick and easy Fahrenheit to Celsius conversion
Mar 07, 2019 Simple C program to convert temperature from either Fahrenheit to Celsius or vise-versa. tempCon.cpp. Simple C program to convert temperature from either Fahrenheit to Celsius or vise-versa. tempCon.cpp. Skip to content. All gists Back to GitHub. Kelvin-Fahrenheit-Celsius temperature converter. Ask Question Asked 4 years, 9 months ago. I'm fine with that; people agree to disagree. I tried longer names for the conversion functions (e.g., convertfahrenheittocelsius. That became a bit verbose with the last two functions. Converting Celsius and Fahrenheit in C.
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- How to convert Fahrenheit to Celcius in C programming to demonstrate the user defined function. Converting the Fahrenheit to Celcius degree C code sample demonstrating user defined function. Compiler: Visual C Express Edition 2005. Compiled on Platform: Windows XP Pro SP2.
There's a simple rule to convert Fahrenheit to Celsius that should be good enough for general use. Simply take 30 off the Fahrenheit value, and then half that number.
Note that this value isn’t perfect, but it might save you having to reach for a calculator (or our site!)
Absolute Zero | -459.67°F | -273.15°C |
---|---|---|
Parity | -40°F | -40°C |
Zero | 0°F | -17.78°C |
Freezing point | 32°F | 0°C |
Body Temperature | 98.6°F | 37°C |
Boiling point | 212°F | 100°C |
Definition of Fahrenheit and Celsius
In the Fahrenheit scale, water freezes at 32 degrees, and boils at 212 degrees. Boiling and freezing point are therefore 180 degrees apart. Normal body temperature is considered to be 98.6 °F (in real-life it fluctuates around this value). Absolute zero is defined as -459.67°F.
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The Celsius scale is nowadays set in such a way that Zero degrees C is the temperature at which ice melts (note : not the temperature at which it freezes, which is different!) . At the other end of the scale, 100 degrees Celsius is the boiling point of water.
The scientific definition of Celsius is now defined against degrees Kelvin. Zero degrees Celsius is 273.15K. One degree Celsius is equal to one Kelvin, so we can say that the boiling point of water is equal to 273.15 + 100 = 373.15 Kelvin.
Fahrenheit to Celsius formula
Why is converting Fahrenheit to Celsius so complicated?
Most things we measure – length, width, time etc. have one thing in common – their values all start from zero. We all know exactly how long zero centimeters or inches is, and can convert zero of any of those units into another type of unit very easily. Zero centimeters = zero meters = zero inches. Taking inches and centimeters as an example, to go from zero inches to 1 inch we need to add one inch. So far, so obvious.
Similarly, to go from zero centimeters to 1 centimeter, we need only add 1 centimeter. The only difference between adding one inch or one centimetre is the amount of distance we're adding. The relationship between an inch and a centimetre is that 1 inch is 2.54 centimetres. So we can say that adding 1 inch is the same as adding 2.54 centimetres. Because they both start at zero, the formula to convert between the two very easy (in = cm * 0.39370)
Temperature units aren't built in the same simple way, because they don't all start in the same place at zero. If we pegged absolute zero to be 0°F, 0°C and 0K, converting between them would be much easier, but Fahrenheit and Celsius were defined before we could tell where absolute zero was, and as a result Fahrenheit, Celsius and Kelvin all start from different values.
Because these temperature units don’t share a common zero point, we need to add or subtract an offset before we do our division or multiplication. It's not a difficult extra step, but it seems to be something that can cause confusion. As a rough rule of thumb:
To go from Fahrenheit to Celsius, take 30 off the Fahrenheit value, and then half that number.
For a 100% accurate answer, subtract 32 and divide by 1.8 (or use the calculator above!)
C++ Convert Fahrenheit To Celsius
Simple, quick °C to °F conversion
Celsius to Fahrenheit conversion is probably the most confusing conversion there is, but a simple °C to °F conversion is actually quite easy – just double the °C figure and add 30. This should be reasonably accurate for weather temperatures.
Absolute Zero | -273.15°C | -459.67°F |
---|---|---|
Parity | -40.00°C | -40°F |
Freezing point | 0°C | 32°F |
Body Temperature | 37°C | 98.6°F |
Boiling point | 100°C | 212°F |
Convert Temperatures Fahrenheit Celsius
Celsius and Fahrenheit definition
The Celsius temperature range was originally defined by setting zero as the temperature at which water froze. Zero degrees C was later redefined as the temperature at which ice melts. The other point at which Celsius was set – 100 degrees Celsius – was defined as the boiling point of water.
Since its definition, the Celsius scale has been redefined to peg it to Kelvin. Zero degrees Celsius is now defined as 273.15K. As one degree Celsius is equal to one Kelvin, boiling point of water is equal to 273.15 + 100 = 373.15 Kelvin.
The Fahrenheit temperature range is based on setting the freezing point of water at 32 degrees, and boiling to 212 degrees. This means that boiling and freezing point are 180 degrees apart. Absolute zero is defined as -459.67°F.
Celsius to Fahrenheit formula
Why is converting Celsius to Fahrenheit so difficult?
Because both Celsius and Fahrenheit scales are offset– ie neither are defined as starting at zero. On top of that, for every additional unit of heat energy the Celsius and Fahrenheit scales add a different additional value. Because of this setup, it’s impossible to say that doubling the °C or °F value doubles the amount of heat energy, so it’s difficult to get an intuitive grasp of how much energy 1 degree Fahrenheit or Celsius actually is.
The only temperature system that works intuitively – where a doubling of value doubles the energy – is Kelvin, where absolute zero is 0, body temperature is 310.15K and boiling water is 373.15K. The problem with the Kelvin scale is that the zero end of the scale is too far from human experience to be useful – as anyone who set their room temperature to 20.5 Kelvin would attest, if they lived long enough.
What is the difference between Centigrade and Celsius?
It’s just a naming convention. Degrees Centigrade and degrees Celsius are the same thing. Degrees Celsius (invented by Anders Celsius) are sometimes called Centigrade, because the scale was defined between 0 and 100 degrees, hence centi-grade meaning a scale consisting of 1/100ths.
Common conversions from Celsius to Fahrenheit
- 25°C= 77°F
- 30°C= 86°F
- 33°C= 91.4°F
- 35°C= 95°F
- 40°C= 104°F
- 180°C= 356°F
Common misspellings of Celsius
- Celcius
Common misspellings of Fahrenheit
- Farenheit
- Farenheight
- Ferenheit
- Ferenheight
- Ferinheit
- Ferinheight
- Fahrinheight
- Fahenhiet