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Why java has fixed data type size unlike C

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问题 In C as we know the size of data types (ex. int) can vary depending on compiler / hardware. But why the size of data types is constant in java language? Why don't we have the flexibility for different data type size in java depending on compiler? 回答1: The JVM (Java Virtual Machine) is designed to be platform independent. If data type sizes were different across platforms, then cross-platform consistency is sacrificed. The JVM isolates the program from the underlying OS and platform. This can

HTML5 Canvas fit to window

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问题 I'm trying to get my canvas to fit the page, when i do: ctx.canvas.width = window.innerWidth; ctx.canvas.height = window.innerHeight; It goes just over horizontally and vertically which is adding scroll bars. the size its going over is about the size of the scroll bars are being accounted for before they're even there (just a guess) is this whats happening, how would I go about getting it to fit the page with no scrollbars. 回答1: Set the the canvas position to absolute . Also make sure there

Getting current size of WPF controls

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问题 I have Image control in my Window. The size of this Image control is set to "Auto". <Image x:Name="videoImg" Stretch="Fill" Height="Auto" Width="Auto" /> When i try to get access, it returns 0. How to see real size of this control? It resizes with window. 回答1: You can use .ActualHeight and .ActualWidth to get the rendered Height / Width of a control 回答2: The thing is, the Width and Height properties let you express the desired size , whereas what you want is the rendered size - which can be

How to change font size in html?

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问题 I am trying to make a website and I want to know how to change the size of text in a paragraph. I want paragraph 1 to be bigger than paragraph 2. It doesn't matter how much bigger, as long as it's bigger. How do I do this? My code is below: <html> <head> <style> p { color: red; } </style> </head> <body> <p>Paragraph 1</p> <p>Paragraph 2</p> </body> </html> 回答1: Give them a class and add your style to the class. <style> p { color: red; } .paragraph1 { font-size: 18px; } .paragraph2 { font-size

What is the size of a bool in PHP?

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问题 What is the size of a bool in PHP? For an int, it's easy to determine echo PHP_INT_SIZE; I got 4 so 8 bytes or 32 bits. What about for a bool type? Thanks. 回答1: The size of a bool can be found by looking at the php source directory Zend/zend_types.h : typedef unsigned char zend_bool; With the size of unsigned char being 1 byte. 来源： https://stackoverflow.com/questions/5972039/what-is-the-size-of-a-bool-in-php

What size buffer should be used for reading from a UDP socket?

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问题 When reading data from a std::net::UdpSocket in Rust we use a buffer: fn recv_from(&self, buf: &mut [u8]) -> Result<(usize, SocketAddr)> How big should this buffer be? Is the socket a stream or a datagram? 回答1: You should use a size one larger than the largest expected datagram. That way, if you receive one that size, you know there was a protocol error and that data may have been truncated. You will receive one datagram at a time. It's not a stream. 回答2: You may try to use the receive

Character set encodings and storage size factors

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For Oracle, is there a matrix/tabulated info on storage allocations given various character encoding. For example: size_of_col_in(AL32UTF8) == 4 * size_of_col_in(WE8ISO8859P1) I am interested in that factor value 4 Unless you are only interested in the maximum change, your example is not correct. AL32UTF8 is a variable-length character set. Speaking in general terms, any character that is in the US7ASCII character set will take 1 byte, European characters generally require 2 bytes, various Asian language characters require 3 bytes, and a handful of very rare characters will require 4 bytes.

How to make canvas bigger in turtles python

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问题 I made a turtle drawing program in python, but my canvas in which the turtle draws is not big enough. I am trying to make this canvas bigger so that I can fit more on the page and make the stuff bigger. I am programming this in trinket.io. 回答1: I am programming this in trinket.io. That is your problem -- Unfortunately, this is not possible in trinket.io. Trinket.io does not support all the turtle methods. You can read which ones are supported here; I assume the rest are unsupported. This will

PHP Upload Form - can't upload 200kb image file

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问题 I have a form to upload 2 files. They can upload one, or just upload both at the same time. When I upload 2 small image files (both under 100kb), they work perfect. But if one file is larger, say around 200kb, it doesn't work. I already set the max value to "100000" in the hidden tag below, so I'm not sure what else I can do to fix this? <form enctype="multipart/form-data" action="upload.php" method="post"> <b>Image File</b><br /> <input type="hidden" name="MAX_FILE_SIZE" value="100000" /> <b

Why does argument matching in C++ ignore array sizes?

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问题 In this example, getSize() returns the size of an array. template <class T, size_t N> size_t getSize(T(&array)[N]) { return N; } While this code does not compile: template <class T, size_t N> size_t getSize(const T array[N]) { return N; } After some research I concluded that this means that C++ will allow something like this: void func(char c[10]) {} int main() { char c[5]; func(c); } The fact that this code compiles without even generating a warning was a surprise to me. If array size