ascii

How to convert a string to ASCII value in PHP without ord()?

由 ⅰ亾dé卋堺 提交于 2019-12-22 07:53:04
问题 I am looking to convert a string say 'Hello' world to its ASCII value in php. But I don't want to use ord() . Are there any other solutions for printing ascii value without using ord() ? 回答1: unpack() Unpacks from a binary string into an array according to the given format. Use the format C* to return everything as what you'd get from ord() . print_r(unpack("C*", "Hello world")); Array ( [1] => 72 [2] => 101 [3] => 108 [4] => 108 [5] => 111 [6] => 32 [7] => 119 [8] => 111 [9] => 114 [10] =>

How to read a byte and save ASCII value of byte in integer in c++

由 允我心安 提交于 2019-12-22 06:56:23
问题 I have a simple question that is confusing me. Goal : I want to read a given byte from a file (say the first byte) and make int x with the ASCII value of that byte. So, for example, if the byte/character is 'a', I want x to be 97 (= 61 in hex). I have the following reading the first byte of the file example.txt: #include <iostream> #include <fstream> #include <string> using namespace std; int main(){ unsigned int x; unsigned char b; ifstream myFile ("example.txt", ios::out | ios::binary);

How to convert Hex to ASCII

由 妖精的绣舞 提交于 2019-12-22 06:24:33
问题 I'm writing a go program to convert hex to int, binary and ascii. The int and binary worked fine but ascii is causing issues. If the input text is shorter than 2 characters it works fine, but anything longer causes malformed text to appear. My code is as follows: package main import "fmt" import "strconv" func main() { // get input as string fmt.Print("Enter hex to convert: ") var input_hex string = "" fmt.Scanln(&input_hex) // convert hex to int and print outputs if i, err := strconv

How to convert Hex to ASCII

由 隐身守侯 提交于 2019-12-22 06:24:27
问题 I'm writing a go program to convert hex to int, binary and ascii. The int and binary worked fine but ascii is causing issues. If the input text is shorter than 2 characters it works fine, but anything longer causes malformed text to appear. My code is as follows: package main import "fmt" import "strconv" func main() { // get input as string fmt.Print("Enter hex to convert: ") var input_hex string = "" fmt.Scanln(&input_hex) // convert hex to int and print outputs if i, err := strconv

How to iterate through all ASCII characters in Bash?

由 会有一股神秘感。 提交于 2019-12-22 05:53:16
问题 I know how to iterate through alphabets: for c in {a..z}; do ...; done But I can't figure out how to iterate through all ASCII characters. Does anyone know how? 回答1: What you can do is to iterate from 0 to 127 and then convert the decimal value to its ASCII value(or back). You can use these functions to do it: # POSIX # chr() - converts decimal value to its ASCII character representation # ord() - converts ASCII character to its decimal value chr() { [ ${1} -lt 256 ] || return 1 printf \\$

Why do upper case letters come before lower case letters in the ASCII table?

由 帅比萌擦擦* 提交于 2019-12-22 04:29:22
问题 In one of my interview, the interviewer asked me why the upper case letters are before the lower case letters in ASCII table, I searched on google.com but found nothing, could anyone gave me the answer? Thx a lot! 回答1: I'm only guessing, but I imagine it's because the earliest character sets had no lowercase at all. The Baudot telegraph code was only 5 bits, and CDC mainframes natively used a 6-bit code; there was no room for lowercase. When ASCII was developed as a 7-bit code which finally

cscript - print output on same line on console?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-22 04:11:45
问题 If I have a cscript that outputs lines to the screen, how do I avoid the "line feed" after each print? Example: for a = 1 to 10 WScript.Print "." REM (do something) next The expected output should be: .......... Not: . . . . . . . . . . In the past I've used to print the "up arrow character" ASCII code. Can this be done in cscript? ANSWER Print on the same line, without the extra CR/LF for a=1 to 15 wscript.stdout.write a wscript.stdout.write chr(13) wscript.sleep 200 next 回答1: Use WScript

Encoding a string to ascii

由 戏子无情 提交于 2019-12-22 03:54:33
问题 I have a long string that I want to encode to ascii. I'm doing: s = s.encode('ascii', 'replace') but I get: 'ascii' codec can't decode byte 0xc3 in position 2646: ordinal not in range(128) (I've also tried 'ignore' but it doesn't help.) What am I doing wrong? 回答1: Your string is already encoded with some encoding. Before encoding it to ascii, you must decode it first . Python is implicity trying to decode it (That's why you get a UnicodeDecodeError not UnicodeEncodeError ). You can solve the

Why is Python insisting on using ascii?

由 老子叫甜甜 提交于 2019-12-22 01:32:19
问题 When parsing an HTML file with Requests and Beautiful Soup, the following line is throwing an exception on some web pages: if 'var' in str(tag.string): Here is the context: response = requests.get(url) soup = bs4.BeautifulSoup(response.text.encode('utf-8')) for tag in soup.findAll('script'): if 'var' in str(tag.string): # This is the line throwing the exception print(tag.string) Here is the exception: UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 15: ordinal not in

文本文件和二进制文件的区别

由 会有一股神秘感。 提交于 2019-12-22 00:38:46
文本文件： 文本文件是一种计算机文件，它是一种典型的顺序文件，其文件的逻辑结构又属于流式文件。 特别的是，文本文件是指以ASCII码方式(也称文本方式)存储的文件，更确切地说，英文、数字等字符存储的是ASCII码，而汉字存储的是机内码。文本文件中除了存储文件有效字符信息（包括能用ASCII码字符表示的回车、换行等信息）外，不能存储其他任何信息。 文本文件是一种由若干行字符构成的 计算机文件 。文本文件存在于计算机文件系统中。通常，通过在文本文件最后一行后放置文件结束标志来指明文件的结束。 文本文件是指一种容器，而纯文本是指一种内容。文本文件可以包含纯文本。 一般来说，计算机文件可以分为两类：文本文件和 二进制文件 。[2] 格式 ASCII ASCII 标准使得 文件 只含有ASCII字符的文本文件可以在 Unix 、 Macintosh 、 Microsoft Windows 、 DOS 和其它 操作系统 之间自由交互，而其它格式的文件是很难做到这一点的。但是，在这些操作系统中，换行符并不相同，处理非ASCII字符的方式也不一致。 MIME 文本文件在MIME标准中的类型为“text/plain”，此外，它通常还附加编码的信息。在Mac OS X出现前，当Resource fork指定某一个文件的类型为“TEXT”时，Mac OS就认为这个文件是文本文件。在Windows中
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