Top 10 Java Programming Coding Interview Questions Answers for programmers Java coding interview questions answers Java coding interview questions are mostly some programming exercises which is asked to be solved in java programming language in limited time during any core Java or J2EE interview. No matter whether you have 2 years of experience or 4 years of experience, There is always some coding interview question in Java programming job you are applying. Actually questions related to Java Coding are increasingly getting popular on Java interviews for two reasons, first its difficult to crack Java coding interview questions than answering fact based questions like Why String is immutable in Java or Why main is static in Java ; Second reason of popularity of Coding question in Java interviews is read need of good developers who are required to do lot of coding in projects rather than doing some maintenance works. These Coding interview questions are collected from various Java programming interviews, from friends and colleagues and can be a good starting point to refresh your coding skills before appearing on any Java interviews.
Simple Report all non-const variables declared at namespace scope. Avoid singletons Singletons are basically complicated global objects in disguise. In a multi-threaded environment, the initialization of the static object does not introduce a race condition unless you carelessly access a shared object from within its constructor.
Note that the initialization of a local static does not imply a race condition. However, if the destruction of X involves an operation that needs to be synchronized we must use a less simple solution.
If you, as many do, define a singleton as a class for which only one object is created, functions like myX are not singletons, and this useful technique is not an exception to the no-singleton rule. Enforcement Very hard in general. Look for classes with names that include singleton.
Look for classes for which only a single object is created by counting objects or by examining constructors.
Make interfaces precisely and strongly typed Reason Types are the simplest and best documentation, have well-defined meaning, and are guaranteed to be checked at compile time. Also, precisely typed code is often optimized better. That is error-prone and often verbose.
Consider using a variant or a pointer to base instead. For generic code these Ts can be general or concept constrained template parameters. An int can carry arbitrary forms of information, so we must guess about the meaning of the four ints.
Most likely, the first two are an x,y coordinate pair, but what are the last two? Comments and parameter names can help, but we could be explicit: Hard to do well Look for member functions with many built-in type arguments.
State preconditions if any Reason Arguments have meaning that may constrain their proper use in the callee. The type system cannot easily and naturally express that, so we must use other means. For now, we place it in the definition function body.
Expects is described in GSL. Note Prefer a formal specification of requirements, such as Expects p. Note Most member functions have as a precondition that some class invariant holds.
That invariant is established by a constructor and must be reestablished upon exit by every member function called from outside the class. The rules for passing pointers. Prefer Expects for expressing preconditions Reason To make it clear that the condition is a precondition and to enable tool use.
This can make them hard to distinguish from ordinary code, hard to update, hard to manipulate by tools, and may have the wrong semantics do you always want to abort in debug mode and check nothing in productions runs?
Once language support becomes available e.The factorial of a negative number doesn’t exist. And the factorial of 0 is 1. You will learn to find the factorial of a number using recursion method in this example.
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This C++ Program demonstrates the the computation of Factorial of a number using Recursion. Here is source code of the C++ Program to Find Factorial of a Number using Recursion. The C++ program is successfully compiled and run on a Linux system. C Programs: String Operations Without using Library Function.
No Programs; 1: C Program to count number of words digits and vowels using pointers in C Programming. This definition says that the factorial of 0 is 1, and the factorial of any other value, n, is n multiplied by the factorial of n1.
So 3! is 3 times 2!, which is 2 times 1!, which is 1 times 0!. C Program to Find Factorial of a Number Using Recursion.
The factorial of a positive number n is given by: factorial of n (n!) = 1*2*3*4.n. The factorial of a negative number doesn't exist.
And the factorial of 0 is 1. You will learn to find the factorial of a number using recursion in .