Programming Articles - Page 2117 of 3363

The iswblank () function in C++ is used to check if the given wide character is blank not. It is present in “ctype.h” header file in C language and “cctype” header file in C++ Standard template library (STL).Syntax of iswblank is as followsint iswblank(wint_t ch)Return Type − returns non zero value if it contains blank spaces and value 0 if it doesn’t.Parameters − ch − This is the character to be checked.ExampleInput − string str = “I Love Myself”Output − total number of spaces is − 2Input − string str = “Myself”Output − total number of spaces is − 0Approach used ... Read More

With given array the task is to create a function which will return pointer to an array of integer function pointers.For that we will input the two values and call a function which compares both the two values and functions pointer which return the memory address of bigger value and print it as a result. The function pointer is used to pass address of different function at different times thus making the function more flexible and abstract. So function pointers can be used to simplify code by providing a simple way to select a function to execute based on run-time ... Read More

The functions isupper() and islower() in C++ are inbuilt functions present in “ctype.h” header file. It checks whether the given character or string is in uppercase or lowercase.What is isupper()?This function is used to check whether the given string contains any uppercase letter or not and also if we have one character as an input then it checks whether the character is in uppercase or not.Syntaxint isupper ( int arg)ExplanationThis function has return type as int as it returns non zero value when the string contains uppercase letter and 0 otherwise. It has one parameter which will contain the character ... Read More

Given the task is to show the working of deque::cbegin() in C++ STL.What is Deque::cbegin( ) function?deque::cbegin() is a function which comes under deque header file, cbegin() returns the iterator pointer which points to the first element of the deque container.Note − cbegin() function does not have any arguments in it.Syntaxdeq.cbegin();Where deq is the deque’s object.Return ValueThe function returns a const_iterator.const_iterator is a random access iterator which is used to point to the first element of the deque container. We can traverse the whole container using the first element of the container, but this can’t be used to do the ... Read More

Given the task is to show the working of deque::crbegin() in C++.Deque is a double ended queue that gives insertion and deletion at each end i.e. front and back with high performance, in contrast to vector that gives high performance insertion at the end i.e. back only.Also, it provides random access to components too. Though one can insert part in between alternative components in dequeue with insert(), however its performance won't be sensible rather like a vector.What is deque::crbegin()?Deque::crbegin(), where crbegin is the constant reverse begin, implies it constantly reverse the begin or in other words it returns the constant_reverse_iterator.What ... Read More

Except for control characters,  (+ ? . * ^ $ ( ) [ ] { } | \), all characters match themselves. You can escape a control character by preceding it with a backslash.Following table lists the regular expression syntax that is available in Python −Sr.No.Pattern & Description1^Matches beginning of line.2$Matches end of line.3.Matches any single character except newline. Using m option allows it to match newline as well.4[...]Matches any single character in brackets.5[^...]Matches any single character not in brackets6re*Matches 0 or more occurrences of preceding expression.7re+Matches 1 or more occurrence of preceding expression.8re?Matches 0 or 1 occurrence of preceding ... Read More

Regular expression literals may include an optional modifier to control various aspects of matching. The modifiers are specified as an optional flag. You can provide multiple modifiers using exclusive OR (|), as shown previously and may be represented by one of these −Sr.No.Modifier & Description1re.IPerforms case-insensitive matching.2re.LInterprets words according to the current locale. This interpretation affects the alphabetic group (\w and \W), as well as word boundary behavior(\b and \B).3re.MMakes $ match the end of a line (not just the end of the string) and makes ^ match the start of any line (not just the start of the string).4re.SMakes ... Read More

One of the most important re methods that use regular expressions is sub.Syntaxre.sub(pattern, repl, string, max=0)This method replaces all occurrences of the RE pattern in string with repl, substituting all occurrences unless max provided. This method returns modified string.Example Live Demo#!/usr/bin/python import re phone = "2004-959-559 # This is Phone Number" # Delete Python-style comments num = re.sub(r'#.*$', "", phone) print "Phone Num : ", num # Remove anything other than digits num = re.sub(r'\D', "", phone) print "Phone Num : ", numOutputWhen the above code is executed, it produces the following result −Phone Num : 2004-959-559 Phone Num : 2004959559Read More

Python offers two different primitive operations based on regular expressions: match checks for a match only at the beginning of the string, while search checks for a match anywhere in the string (this is what Perl does by default).Example Live Demo#!/usr/bin/python import re line = "Cats are smarter than dogs"; matchObj = re.match( r'dogs', line, re.M|re.I) if matchObj:    print "match --> matchObj.group() : ", matchObj.group() else:    print "No match!!" searchObj = re.search( r'dogs', line, re.M|re.I) if searchObj:    print "search --> searchObj.group() : ", searchObj.group() else:    print "Nothing found!!"OutputWhen the above code is executed, it produces the following ... Read More

This function searches for first occurrence of RE pattern within string with optional flags.SyntaxHere is the syntax for this function −re.search(pattern, string, flags=0)Here is the description of the parameters −Sr.No.Parameter & Description1patternThis is the regular expression to be matched.2stringThis is the string, which would be searched to match the pattern at the beginning of string.3flagsYou can specify different flags using bitwise OR (|). These are modifiers, which are listed in the table below.The re.search function returns a match object on success, none on failure. We use group(num) or groups() function of match object to get matched expression.Sr.No.Match Object Method & Description1group(num=0)This method returns entire match ... Read More