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The document converter library auto-detects source document format and gives you all the control to convert either the whole document or specific pages to the desired output format. It’s easier to replace missing fonts with preferred ones and add text or image watermarks to any document page. C is a middle-level programming language developed by Bjarne Stroustrup starting in 1979 at Bell Labs. C runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This C tutorial adopts a simple and practical approach to describe the concepts of C for beginners to advanded software engineers.

Jan 19, 2012 Convert + to%2B in a string PHP. So I have been debugging a script and a lot of the data being passed into it contained this symbol: '+'. I discovered that if I changed it to%2B that it worked. I know this must be sort of a very basic question but after poking around the PHP documentation, I couldn't find a solution.

First, two big things--the main function and how to compile it, followed bylots of little differences.

main function

C++

Java

Compiling

C++

Java

Comments

Same in both languages (// and /* */ both work)

Class declarations

Almost the same, but Java does not require a semicolon

C++

Java

Method declarations

Same, except that in Java, must always be part of a class, and may prefix withpublic/private/protected

Constructors and destructors

Constructor has same syntax in both (name of the class), Java has no exactequivalent of the destructor

Static member functions and variables

Same as method declarations, but Java provides static initializationblocks to initialize static variables (instead of putting a definition ina source code file):

Scoping static methods and namespaces

C++

If you have a class and wish to refer to a static method, you use the form Class::method.

Java

All scoping in Java uses the . again, just like accessing fields of a class, so it's a bit more regular:

Object declarations

C++

Java

Accessing fields of objects

C++

If you're using a stack-based object, you access its fields with a dot:But you use the arrow operator (->) to access fields of a class when working with a pointer:

Java

You always work with references (which are similar to pointers--see the next section), so you always use a dot:

References vs. pointers

C++

Java

Inheritance

C++

Java

Protection levels (abstraction barriers)

C++

Java

Virtual functions

C++

Java

Abstract classes

C++

Java

Memory management

Roughly the same--new allocates, but no delete in Java since ithas garbage collection.

NULL vs. null

C++

Java

Booleans

Java is a bit more verbose: you must write boolean instead of merely bool.

C++

Java

Const-ness

C++

Java

Throw Spec

First, Java enforce throw specs at compile time--you must document if yourmethod can throw an exception

C++