Tutorial by Examples: char

Newline character is not consumed in typical scanf() call

When this program #include <stdio.h> #include <string.h> int main(void) { int num = 0; char str[128], *lf; scanf("%d", &num); fgets(str, sizeof(str), stdin); if ((lf = strchr(str, '\n')) != NULL) *lf = '\0'; printf("%d \"%s\&...

C Language • Common pitfalls

Minimal Chart Example

Depending on the version of Chart.JS you are using (the current one being 2.X), the syntax is different to create a minimal example of a bar chart (JSFiddle Demo for 2.X). Chart.js 2.X <html> <body> <canvas id="myChart" width="400" height="400&...

chart.js • Getting started with chart.js

What characters need to be escaped?

Character escaping is what allows certain characters (reserved by the regex engine for manipulating searches) to be literally searched for and found in the input string. Escaping depends on context, therefore this example does not cover string or delimiter escaping. Backslashes Saying that backsla...

Regular Expressions • Escaping

Which CHARACTER SET and COLLATION?

There are dozens of character sets with hundreds of collations. (A given collation belongs to only one character set.) See the output of SHOW COLLATION;. There are usually only 4 CHARACTER SETs that matter: ascii -- basic 7-bit codes. latin1 -- ascii, plus most characters needed for Western Eur...

MySQL • Character Sets and Collations

Checking a string for unwanted characters

As a developer, you frequently find yourself dealing with strings that are not created by your own code. These will often be supplied by third party libraries, external systems, or even end users. Validating strings of unclear provenance is considered to be one of the hallmarks of defensive program...

guava • Strings

Character literals

Character literals are a special type of integer literals that are used to represent one character. They are enclosed in single quotes, e.g. 'a' and have the type int. The value of the literal is an integer value according to the machine's character set. They do not allow suffixes. The L prefix bef...

C Language • Literals for numbers, characters and strings

Finding and counting characters in a string

To help you find and count characters in a string, CharMatcher provides the following methods: int indexIn(CharSequence sequence) Returns the index of the first character that matches the CharMatcher instance. Returns -1 if no character matches. int indexIn(CharSequence sequence, int sta...

guava • Strings

Changing the case of characters within a String

The System.String class supports a number of methods to convert between uppercase and lowercase characters in a string. System.String.ToLowerInvariant is used to return a String object converted to lowercase. System.String.ToUpperInvariant is used to return a String object converted to upper...

C# Language • Common String Operations

Individual characters of strings are not assignable

foo = "bar" foo[0] = "c" # Error Immutable variable value can not be changed once they are created.

Python Language • Immutable datatypes(int, float, str, tuple and frozensets)

Removing unwanted characters from a string

The example Checking a string for unwanted characters, describes how to test and reject strings that don't meet certain criteria. Obviously, rejecting input outright is not always possible, and sometimes you just have to make do with what you receive. In these cases, a cautious developer will attemp...

guava • Strings

Append a string to char array using fromstring() method

You are able to append a string to a character array using fromstring() my_char_array = array('c', ['g','e','e','k']) my_char_array.fromstring("stuff") print(my_char_array) #array('c', 'geekstuff')

Python Language • Arrays

Looping over characters of a string

2005 The following iterates over the characters of the string s. It works similarly for looping over the elements of an array or a set, so long as the type of the loop-control variable (c, in this example) matches the element type of the value being iterated. program ForLoopOnString; {$APPTYPE ...

Embarcadero Delphi • For Loops

Create excel charts with xlsxwriter

import xlsxwriter # sample data chart_data = [ {'name': 'Lorem', 'value': 23}, {'name': 'Ipsum', 'value': 48}, {'name': 'Dolor', 'value': 15}, {'name': 'Sit', 'value': 8}, {'name': 'Amet', 'value': 32} ] # excel file path xls_file = 'chart.xlsx' # the workbook w...

Python Language • Python and Excel

Creating a Chart with Ranges and a Fixed Name

Charts can be created by working directly with the Series object that defines the chart data. In order to get to the Series without an exisitng chart, you create a ChartObject on a given Worksheet and then get the Chart object from it. The upside of working with the Series object is that you can s...

excel-vba • Charts and Charting

Creating an empty Chart

The starting point for the vast majority of charting code is to create an empty Chart. Note that this Chart is subject to the default chart template that is active and may not actually be empty (if the template has been modified). The key to the ChartObject is determining its location. The syntax...

excel-vba • Charts and Charting

Create a Chart by Modifying the SERIES formula

For complete control over a new Chart and Series object (especially for a dynamic Series name), you must resort to modifying the SERIES formula directly. The process to set up the Range objects is straightforward and the main hurdle is simply the string building for the SERIES formula. The SERIES ...

excel-vba • Charts and Charting

Arranging Charts into a Grid

A common chore with charts in Excel is standardizing the size and layout of multiple charts on a single sheet. If done manually, you can hold down ALT while resizing or moving the chart to "stick" to cell boundaries. This works for a couple charts, but a VBA approach is much simpler. Co...

excel-vba • Charts and Charting

POSIX Character classes

POSIX character classes are predefined sequences for a certain set of characters. Character classDescription[:alpha:]Alphabetic characters[:alnum:]Alphabetic characters and digits[:digit:]Digits[:xdigit:]Hexadecimal digits[:blank:]Space and Tab[:cntrl:]Control characters[:graph:]Visible characters ...

Regular Expressions • Character classes

CHAR(n)

CHAR(n) is a string of a fixed length of n characters. If it is CHARACTER SET utf8mb4, that means it occupies exactly 4*n bytes, regardless of what text is in it. Most use cases for CHAR(n) involve strings that contain English characters, hence should be CHARACTER SET ascii. (latin1 will do just ...

MySQL • Data Types

char

An integer type which is "large enough to store any member of the implementation’s basic character set". It is implementation-defined whether char is signed (and has a range of at least -127 to +127, inclusive) or unsigned (and has a range of at least 0 to 255, inclusive). const char zer...

C++ • Basic Type Keywords