Unit conversion in c language

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Unit conversion in c language

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I purchased "A Book on C" for my procedural programming class and I was going through some of the exercises. Chapter 2 Exercise 9 is about designing a unit converter that can work with ounces, pounds, grams, and kilograms.

The code I've written works, but I really think it could be done much cleaner.

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Using nested if statements seems like a messy way to go about this. Also, one problem I noticed was that if a char or string is given to scanf on line 27, it will persist and then be passed to the scanf on line For example, if you enter "y" as the value to convert, the program will goto beginning without allowing the user to answer "Would you like to perform additional conversions?

One way to clean up the if structure would be to convert the value from the "fromUnit" to a common value and then convert it to the "toUnit". It simplifies the structure by leaving only two if structures around.

It also scales better. So, it would be something more like:. Granted, that math isn't correct, it's just there for the example. You would just have to 1 pick the temporary unit that you wanted to use 2 convert from the input unit to that unit and 3 convert from the temporary unit to the output unit. The most reliable way is to read input string using fgets function, check if it contains digit using isdigit all characters in string and then convert it to numeric value using atoi.

Learn more. Simple unit converter in C Ask Question. Asked 9 years, 7 months ago. Active 8 years, 3 months ago. Viewed 4k times. Justin Ethier k 47 47 gold badges silver badges bronze badges. I recommend setting up enums - integers starting at 0 representing types. Then stick conversions into a symmetric n x n matrix.

Finally, use that to find the right coefficient. Put the code here, instead of using pastebin. SO questions are expected to hang around, so other people can benefit from reading them and their answers. Putting important information on other websites is counterproductive. Please put at least the important parts of the code in your question. Active Oldest Votes. So, it would be something more like: if!

And as someone else mentioned, gets is definitely the way to go. Richard Richard 5, 4 4 gold badges 27 27 silver badges 46 46 bronze badges. I was just about to suggest something similar. I can't really remember the nuances of reading full strings. I know that you would want to read the entire line at this point, though, not just a single item.We say that a unit is normalized if nested product and quotient terms have been removed as far as possible, so that the unit will be at most a quotient of two products.


Clearly, any unit can be normalized; algorithms for simplification of units are described later. Unit Conversion A single numeric conversion factor is associated with each simple unit.

unit conversion in c language

The conversion factor is the number by which a quantity expressed in that unit must be multiplied in order to be expressed in the equivalent unit in the standard system of units. Thus, the conversion factor for meter is 1. The conversion factor for a numeric constant is just the constant itself.

The conversion factor for a product or quotient of units is, respectively, the product or quotient of the factors for the component units. Based on these definitions, it is easy to define a recursive algorithm that computes the conversion factor for any unit, whether simple or composite.

This algorithm is shown in pseudo-code form in Fig. Assuming that the definitions of units are acyclic, the algorithm is guaranteed to terminate and requires time proportional to the size of the unit expression tree.

Examples of unit definitions are shown in Fig. In the first example, each unit is defined by its name, numeric conversion factor, and a list of synonyms.

In the second example, the conversion factor is specified as an expression in terms of previously defined units. Then we have the equations: Thus, conversion to a desired unit is accomplished by multiplying the source quantity by a factor fwhere For example, to convert a measurement in terms of feet to centimetersthe factor would be Given the factor algorithm shown in Fig.

Since a number is also defined as a unit, a numeric quantity of a given unit can also be converted. The convert function takes as arguments the source unit and desired unit; it returns the conversion factor for NIL if the conversion is undefined or incorrect. Dimensional analysis, as described in the next section, is used to verify that a requested conversion is correct; if not, a result of NIL is returned rather than a numeric conversion factor. There are certain conversions that, while not strictly correct, deserve a special note.

The poundfor example, which is a unit of mass, is often used as the name of the force unit that is properly called pound-force. Similarly, in particle physics the mass of a particle is often described using energy units such as gigaelectronvolts GeV.

As described below, the dimensional analysis system can either perform strict dimensional checking and prohibit force-mass and energy-mass conversion, or it can be made to detect and allow these specific conversions, with strict checking otherwise.

Each of these is a physical constant, expressed in SI units. Dimensional Analysis If the above algorithms are to produce meaningful results, it must be verified that the requested conversion is legitimate; it is clearly impossible, for example, to convert kilograms to meters. Correctness of unit conversion is verified by the long-established technique of dimensional analysis [bridgman]: the source and goal units must have the same dimensions.

Formally, we define a dimension as an 8-vector of integral powers of eight base quantities. The base quantities are shown in Fig. We have added moneywhich is not part of the SI system, as a dimension. It can be verified that conversion from one unit to another is legitimate by showing that the dimension vectors of the two units are equal, or equivalently, that their difference is a zero vector.

The powers of base quantities that are encountered in practice are usually small: they are seldom outside the range 4. While a dimension can be represented as a vector of eight integer values, with dimension checking done by operations on vectors, this is somewhat expensive computationally.

Since the integers in the vector are small, it might be more efficient to pack them into bit fields within an integer word. In this section, we describe a variation of this packing technique.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. But when I ran this same code with HackerRank, all testcases were passed, I have no idea, how this is working here? With the changes made to allow space in tt to accommodate the nul-terminating character, the code functions well in making conversions to military time.

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Learn more. Asked 4 years ago. Active 1 year, 3 months ago. Viewed 15k times. I am confused at this stage, am I doing this right? You are 1-char short on char tt[2]; You forgot about the nul-terminating character. Rankin Apr 12 '16 at Rankin, how does variable hh return zero, just because of char pointer is having a shorter storage space? It runs poorly. You invoke undefined behavior. If tt is right before hhthe final nul character will overwrite the first byte of hhsetting it to zero on a little endian architecture.

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Active Oldest Votes. David C. Rankin David C.

How to Use Conversion Characters in the C Language’s printf() Function

Rankin 56k 4 4 gold badges 37 37 silver badges 59 59 bronze badges. See here msdn. Rankin Apr 14 '16 at Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….

Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits. Related Hot Network Questions.The program should prompt invalid unit when something other than mm, cm, m or km is entered as the unit to be converted from or unit to be converted to. The problem is how I initialize the units. When debugging, input ends the program. What do I do?

Two characters must be enclosed in double quotes, such as "mm". How do I take care of the parts where I have else if from line 58 downwards. This is what I have now but when I use mm or cm or m or km, it shows the invalid message and then asks me to input the valu which it does correctly.

How do I tackle that part? The pogram isn't going to work unless you increase the size of those two variables. Let's say you enter "mm".

Celsius to Fahrenheit conversion

Not possible. I have made the change but it is meant to quit if the user enters the wrong unit. Even when I use the correct value, though it runs, it shows me the invalid message instead of the next instruction.

I already told you what's wrong with it, reread my previous post, second paragraph. Sometimes even more experienced programmers have that problem. Man you are awesome. Thanks alot. I got it already. I also put the return 0 after line 26 and It made the program end when the user inputs wrong values. Now it is perfect. Please kindly look at my second post if you could help out.

Computer Programming/Type conversion

Do you mean this one? Not that I know of. I don't know very much about java. This is what I have now but the output from line 32, it should output the characters on the same line but it shows the characters on different lines.

The second comparism doesn't seem to come out well too. You mean NetBeans? It's an IDE that's used for several different languages. This is the output I have but it should be a n c and not separating the characters.

Also I should not have 1,5 and 6 it should be characters like the first one should be. You need to fix all the compiler errors before you attempt to run the program. Edited 6 Years Ago by Ancient Dragon. That would all be simpler if you used std::string instead of char arrays. You never answered the last question, the problem states it's supposed to be in java. The second comparism doesn't seem to come out well too Line number please???

Line number It outputs integers instead of characters I mean alphabets.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I would like to convert from imperial units to metric and vice versa in R. How do I go about doing that? You enter the imperial value you have, what unit you're converting from e. It has a variety of different dimensions not just length. The nature of the units may affect the presence or absence.

In general I think, unfortunately, that gsk3 is correct. There are some function in the 'Hmisc', 'gdata', and 'marelac' packages:.

unit conversion in c language

Package "dielectric" was mentioned by Brian Diggs in an answer to a similar question: Link to 'constants' help page in package 'dielectric'. I think those will provide examples of doing so and the function package. I think the package would be a welcome addition. Update: The 'udunits2' package was mentioned by Gabor Grothendieck in a similar question to rhelp July 23, It appears to require installation of a stand-alone OS-specific package of the same name.

Without such installation you get a rather unhelpful error message:. There is the unit and convertUnit functions in the grid package for specifying different length and dimension units. That may do what you want, or give you a place to start if not. There is a "new" R package called units today, that was built upon the udunits2 R package, which is available a while ago.

The udunits2 package does just that. On top of that, the units package work in progress aims at providing a type-safe system for doing arithmetics with units:.

Learn more. Converting units in R Ask Question.

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Asked 8 years, 7 months ago. Active 3 years, 2 months ago. Viewed 14k times.To browse Academia. Skip to main content. Log In Sign Up. Rizqi Meisani. Andy Prasetyo. Energy that showed by temperature usually owned of the object. So the temperature becomes measuring instrument for climate and resource balance that is on earth by because of it high and low temperature is element very important for various research done by scientists. Tool for measuring temperature named a thermometerwhich the thermometer itself divided become 4 that is thermometer Celsius, thermometer Reaumur, thermometer Fahrenheit and thermometer kelvin.

So that can concluded that calculation of temperature change become thing required for continuation of human civilization. Related with things these author make a simple temperature conversion programing language with based codeblocks, which can make it easy for us to converting temperature unit without should using special technique.

Keyword : temperaturethermometer 1. The temperature itself divided into two, that is maximum temperature and minimum temperature because the temperature is measure of heat degrees of the object or the place. While tool measuring temperature named a thermometerand often that used is mercury thermometer and alcohol.

Temperature is also included element very important in life on the worldespecially for humans, animals, or plants. The living things in adapting with environment also determined by temperature.

Can make it easier for us to convert temperature with simple way 2. Can use operation initialization 2. Codeblock will make code writing easier and program running is also easier. While on the Fahrenheit scale point at which water freezes from 32 degrees and boiling point is degrees.

Conversion is a way to changing unit value to other units, and with not changing magnitude. This can be done with unit the same or different.If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.

See your article appearing on the GeeksforGeeks main page and help other Geeks. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Writing code in comment? Please use ide. Python3 program to convert. This code is contributed by Anant Agarwal.

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unit conversion in c language

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