C programming tips and tricks pdf

Posted on Sunday, June 20, 2021 8:22:52 PM Posted by Saraid O. - 20.06.2021 and pdf, edition pdf 4 Comments

c programming tips and tricks pdf

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Mosaic's single board computers are programmable in either the C or Forth programming languages. There are many C programming books and tutorials available both online and on paper.

This handbook does not try to cover everything under the sun related to C. It focuses on the core of the language, trying to simplify the more complex topics. C is probably the most widely known programming language.

The C Beginner's Handbook: Learn C Programming Language basics in just a few hours

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I know there is a standard behind all C compiler implementations, so there should be no hidden features.

Function pointers. You can use a table of function pointers to implement, e. Then there are hidden gems in the standard library, such as qsort ,bsearch , strpbrk , strcspn [the latter two being useful for implementing a strtok replacement]. A misfeature of C is that signed arithmetic overflow is undefined behavior UB. More of a trick of the GCC compiler, but you can give branch indication hints to the compiler common in the Linux kernel. These are an optional item in the standard, but it must be a hidden feature, because people are constantly redefining them.

One code base I've worked on and still do, for now has multiple redefinitions, all with different identifiers. Most of the time it's with preprocessor macros:. And so on. It makes me want to pull my hair out. Just use the freaking standard integer typedefs! The comma operator isn't widely used. It can certainly be abused, but it can also be very useful.

This use is the most common one:. Each statement is evaluated, but the value of the expression will be that of the last statement evaluated. This sets x to 0x or 0x , depending on architecture. EDIT: This technique is not portable, especially if you serialize the int.

However, it can be extremely useful to create self-documenting enums. This makes it much simpler if you're looking at a raw memory dump and need to determine the value of an enum without having to look it up. I never used bit fields but they sound cool for ultra-low-level stuff. Incorporated comments by Aaron and leppie , thanks guys.

C has a standard but not all C compilers are fully compliant I've not seen any fully compliant C99 compiler yet! That said, the tricks I prefer are those that are non-obvious and portable across platforms as they rely on the C semantic. They usually are about macros or bit arithmetic. In general, though, I don't like the tricks that are clever but make the code unnecessarily complicated to read as the swap example and I love the ones that make the code clearer and directly conveying the intention like the FSM example.

Interlacing structures like Duff's Device :. The array initialization is no longer position dependent. Some of my favorites are function attributes. One extremely useful example is the format attribute. This can be used if you define a custom function that takes a printf format string. If you enable this function attribute, gcc will do checks on your arguments to ensure that your format string and arguments match up and will generate warnings or errors as appropriate.

I think that one of the strong points of C language is its portability and standardness, so whenever I find some "hidden trick" in the implementation I am currently using, I try not to use it because I try to keep my C code as standard and portable as possible.

Compile-time assertions, as already discussed here. I was quite surprised not seeing it allready in the answers, as all compilers I know of support it, but many programmers seems to ignore it. Sometimes it's really handy and not only when writing macros. Now I want to build the full path including filenames to open ressources. It just goes to:. Well, I've never used it, and I'm not sure whether I'd ever recommend it to anyone, but I feel this question would be incomplete without a mention of Simon Tatham's co-routine trick.

When initializing arrays or enums, you can put a comma after the last item in the initializer list. This was done so that if you're generating code automatically you don't need to worry about eliminating the last comma. Struct assignment is cool. Many people don't seem to realize that structs are values too, and can be assigned around, there is no need to use memcpy , when a simple assignment does the trick. For example, consider some imaginary 2D graphics library, it might define a type to represent an integer screen coordinate:.

Now, you do things that might look "wrong", like write a function that creates a point initialized from function arguments, and returns it, like so:.

This is safe, as long of course as the return value is copied by value using struct assignment:. C compilers implement one of several standards. However, having a standard does not mean that all aspects of the language are defined. Duff's device , for example, is a favorite 'hidden' feature that has become so popular that modern compilers have special purpose recognition code to ensure that optimization techniques do not clobber the desired effect of this often used pattern.

In general hidden features or language tricks are discouraged as you are running on the razor edge of whichever C standard s your compiler uses.

Many such tricks do not work from one compiler to another, and often these kinds of features will fail from one version of a compiler suite by a given manufacturer to another version. Other problems and issues that arise whenever programmers make assumptions about execution models that are all specified in most C standards as 'compiler dependent' behavior. Check out section 3.

Can lead to a lot of nasty vulnerabilities. Compile-time assumption-checking using enums: Stupid example, but can be really useful for libraries with compile-time configurable constants.

Gcc c has some fun features you can enable, such as nested function declarations, and the a? The 0 width field tells that the following bitfields should be set on the next atomic entity char. Here I also use the stringize operator and string constant concatentation, other features I really like. Variable size automatic variables are also useful in some cases.

These were added i nC99 and have been supported in gcc for a long time. You end up with a buffer on the stack with room for the fixed-size protocol header plus variable size data. You can get the same effect with alloca , but this syntax is more compact. You have to make sure extraPadding is a reasonable value before calling this routine, or you end up blowing the stack. You'd have to sanity check the arguments before calling malloc or any other memory allocation technique, so this isn't really unusual.

Learn more. Hidden features of C Ask Question. Asked 12 years, 5 months ago. Active 3 years, 5 months ago. Viewed 83k times. Active Oldest Votes. But if they had specified behaviour on overflow, it would have made it very slow on architectures where that was not the normal behaviour. Very low runtime overhead has always been a design goal of C, and that has meant that a lot of things like this are undefined.

I'm very well aware of why overflow is UB. My own conclusion: I think Matlab is a compelling case study that shows why you don't want integer overflow checking. I said that the standard should have provided library support for checking for arithmetic overflow. Now, how can a library routine incur a performance hit if you never use it? A big negative is that GCC does not have a flag to catch signed integer overflows and throw a runtime exception.

While there are x86 flags for detecting such cases, GCC does not utilize them. Having such a flag would allow non-performance-critical especially legacy applications the benefit of security with minimal to no code review and refactoring.

Show 4 more comments. This trick is cool Add a comment. Ben Collins. I think they are C99 or so. I haven't found a portable way to ensure these would be around. They are an optional part of C99, but I know of no compiler vendors that don't implement this. Pete, if you want to be anal: 1 This thread has nothig to do with any Microsoft product.

Have a look at azillionmonkeys. Show 6 more comments. The danger with overloading it is that the built in applies to everything already, including void, so will never fail to compile for lack of available overload. Ie, gives programmer much rope. It doesn't zero the padding, if any, however.

This is what memset does with 0 as second argument. These two kinds of zeros do not necessarily produce the same result. As in the example with pointer. When you do memset on a pointer, you get a 0x pointer. But when you assign 0 to a pointer, you get null pointer value , which at the physical level might be 0xBAADF00D or anything else.

C Tutorials and Courses

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I know there is a standard behind all C compiler implementations, so there should be no hidden features. Function pointers. You can use a table of function pointers to implement, e. Then there are hidden gems in the standard library, such as qsort ,bsearch , strpbrk , strcspn [the latter two being useful for implementing a strtok replacement].

Join them, it only takes 30 seconds. Learn C programming online from the best C tutorials submitted and voted by the programming community. Be the first to get informed of the latest C blog posts, insights, and tips and tricks. Weekly summary email on Saturday. You checked out these tutorials the last time you visited. Please upvote the ones you found useful.

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I know there is a standard behind all C compiler implementations, so there should be no hidden features. Function pointers. You can use a table of function pointers to implement, e. Then there are hidden gems in the standard library, such as qsort ,bsearch , strpbrk , strcspn [the latter two being useful for implementing a strtok replacement].

C - Tips and Tricks

The following are some tips for better quicker programming of Arduinos. Much of the advice applies to other platforms so you may want to take a quick look even if you do not use the Arduino. This advice applies to the standard computer arduino ide, but applies to other environments as well. If you are a rank beginner writing 50 line programs you may not find this useful. However, my typical arduino programs are more like lines plus and these methods really begin to pay off.

C is a general-purpose programming language that is extremely popular, simple, and flexible. It is machine-independent, structured programming language which is used extensively in various applications. Following is a curated list of Top C Programming books that should be part of any C developers library. This book teaches some basic concept of C language with clear and easy steps. This C book gave simple instructions which help you to create useful, reliable C code, from games to mobile apps.

Tips and Tricks on C Programming, 2/e

Still interesting though. Makes me wonder what they are used for internally. Couldnt see a mention of Numerical Recipes In C - this has been a bible for me for years… really handy for basic efficient algorithms, especially useful for embedded stuff….

C Programming Tips and Tricks Every Programmer Should Know

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