What is the difference between runtime and compile time

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Contact No. This is when the code is translated from a programming language to a language that a machine understands. This is when a code is run in the runtime environment and starts from the time code execution starts till the point the user or OS stops the code. After the software development is complete, it comes into play when the code is executed in a runtime environment. The code cannot understand which object is invoking the method, and code is compiled without knowing that information.

The above declaration generates the compile-time error as in C, every statement ends with the semicolon, but we put a colon : at the end of the statement. The above statement throws a compile-time errors. In the above statement, we are assigning the value of 'c' to the summation of 'a' and 'b' which is not possible in C programming language as it can contain only one variable on the left of the assignment operator while right of the assignment operator can contain more than one variable.

The runtime errors are the errors that occur during the execution and after compilation. The examples of runtime errors are division by zero, etc. These errors are not easy to detect as the compiler does not point to these errors.

In the above code, we have tried to print the value of 'a', but it throws an error. We put the colon at the end of the statement instead of a semicolon, so this code generates a compile-time error. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services. Please mail your requirement at [email protected] Duration: 1 week to 2 week. Command Line Arguments. Next Topic Conditional Operator in C. Reinforcement Learning.

R Programming. React Native. Python Design Patterns. Python Pillow. Python Turtle. Verbal Ability. The terms "runtime" and "compile time" are often used by programmers to refer to different types of errors. A compile time error is a problem such as a syntax error or missing file reference that prevents the program from successfully compiling. The compiler produces compile time errors and usually indicates what line of the source code is causing the problem.

If a program's source code has already been compiled into an executable program, it may still have bugs that occur while the program is running. Examples include features that don't work, unexpected program behavior, or program crashes.

These types of problems are called runtime errors since they occur at runtime. The reference. The above code is compiled successfully, there is no syntax error, it is perfectly valid. But at the run time, it throws following error. Like when in compile time certain cases has been checked, after that run time certain cases has been checked once the program satisfies all the condition you will get an output. Otherwise, you will get compile time or run time error.

You can understand the code compile structure from reading the actual code. Run-time structure are not clear unless you understand the pattern that was used. It's not a good question for S. If you think it's trivial: what about read-time vs compile-time, and when is this a useful distinction to make? What about languages where the compiler is available at runtime? In general, it's a tough problem that language designers have seemed to try to avoid.

They often just say "here's a compiler, it does compile-time things; everything after that is run-time, have fun". C is designed to be simple to implement, not the most flexible environment for computation. When you don't have the compiler available at runtime, or the ability to easily control when an expression is evaluated, you tend to end up with hacks in the language to fake common uses of macros, or users come up with Design Patterns to simulate having more powerful constructs.

A simple-to-implement language can definitely be a worthwhile goal, but that doesn't mean it's the end-all-be-all of programming language design. And the problemspace around compile-time and run-time is huge and still largely unexplored. That's not to say S. The question is neither simple nor silly, and we could at least point the inquisitor in the right direction. Unfortunately, I don't know any good references on this. CLTL2 talks about it a bit, but it's not great for learning about it.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Runtime vs. Compile time Ask Question. Asked 12 years, 6 months ago.

Active 5 months ago. Viewed k times. What is the difference between run-time and compile-time? Improve this question. I have given a very small but clear example It does not intimidate with huge detail. After that all the answers may be gone through. They are awesome Add a comment. Active Oldest Votes. To approach this problem, I find it helpful to ask What invariants does the program satisfy? What can go wrong in this phase? If the phase succeeds, what are the postconditions what do we know?

What are the inputs and outputs, if any? Compile time The program need not satisfy any invariants. In fact, it needn't be a well-formed program at all. You could feed this HTML to the compiler and watch it barf What can go wrong at compile time: Syntax errors Typechecking errors Rarely compiler crashes If the compiler succeeds, what do we know?

The program was well formeda meaningful program in whatever language. It's possible to start running the program. The program might fail immediately, but at least we can try. What are the inputs and outputs? Input was the program being compiled, plus any header files, interfaces, libraries, or other voodoo that it needed to import in order to get compiled.

Output is hopefully assembly code or relocatable object code or even an executable program. Or if something goes wrong, output is a bunch of error messages. Run time We know nothing about the program's invariantsthey are whatever the programmer put in.

Run-time invariants are rarely enforced by the compiler alone; it needs help from the programmer. What can go wrong are run-time errors : Division by zero Dereferencing a null pointer Running out of memory Also there can be errors that are detected by the program itself: Trying to open a file that isn't there Trying find a web page and discovering that an alleged URL is not well formed If run-time succeeds, the program finishes or keeps going without crashing.

Inputs and outputs are entirely up to the programmer. Files, windows on the screen, network packets, jobs sent to the printer, you name it. If the program launches missiles, that's an output, and it happens only at run time Improve this answer. Norman Ramsey Norman Ramsey k 57 57 gold badges silver badges bronze badges.

I'll grant, given this answer got accepted, that it may well be outside what the OP was looking for. Nice, if somebody ask me about it during my lectures, I'll use your anwser :- — e-satis. This is really nice answer. It is pretty clear and comprehensible.

It is not easy to find that much clear answers in Google. Even if you've programmed a while it's still not easy to get Good question by the OP. Can you explain this in simple terms, not congested with all this technical garbage? Show 7 more comments. I think of it in terms of errors, and when they can be caught. Now this is something we can all understand.

No general garbage tech words here. For an iPhone App: Is compile time the first time the code is compiled by the developer into a. Honey it is compiled first time by developer into a. This is a great, bottom-line answer that covers the difference between compile and run time conceptually. I appreciate the academic, professorial answer that was chosen as well, but this one is clear and concise. After reading this answer, I can go back and read the chosen answer, and it makes more sense.

Thanks — mojave. Run-time: the time period which a user is running your piece of software. Do you need any clearer definition?

Yuval Adam Yuval Adam k 86 86 gold badges silver badges bronze badges. BCS: The OP may have had a exceedingly simple introduction to programming using an interpreted or byte-compile-then-run-in-one-step language so that the distinction was never needed.