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The reverse of a string is a string with the same symbols but in reverse order. For example, if s = abc (where a, b, and c are symbols of the alphabet), then the reverse of s is cba. A string that is the reverse of itself (e.g., s = madam) is called a palindrome, which also includes the empty string and all strings of length 1.
In functional and list-based languages a string is represented as a list (of character codes), therefore all list-manipulation procedures could be considered string functions. However such languages may implement a subset of explicit string-specific functions as well.
Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...
In computer science, the shunting yard algorithm is a method for parsing arithmetical or logical expressions, or a combination of both, specified in infix notation.It can produce either a postfix notation string, also known as reverse Polish notation (RPN), or an abstract syntax tree (AST). [1]
Finally, the parser reads a '$' (end of input symbol) from the input stream, which means that according to the action table (the current state is 3) the parser accepts the input string. The rule numbers that will then have been written to the output stream will be [5, 3, 5, 2] which is indeed a rightmost derivation of the string "1 + 1" in reverse.
Reverse elements of B along last axis U+233D ⌽ APL FUNCTIONAL SYMBOL CIRCLE STILE: Reversal ⊖B: Reverse elements of B along first axis U+2296 ⊖ CIRCLED MINUS: Grade up ⍋B: Indices of B which will arrange B in ascending order U+234B ⍋ APL FUNCTIONAL SYMBOL DELTA STILE: Grade down ⍒B: Indices of B which will arrange B in descending order
Thus we get the names of the strings from 6th string to the 1st string in that order. Conversely, a mnemonic listing the strings in the reverse order is: Every Beginning Guitarist Does All Exercises! Elvis' Big Great Dane Ate Everything; Every Big Girl Deserves An Elephant; Easter Bunny Gets Drunk At Easter; Easter Bunnies Go Dancing After Easter
The \n escape sequence allows for shorter code by specifying the newline in the string literal, and for faster runtime by eliminating the text formatting operation. Also, the compiler can map the escape sequence to a character encoding system other than ASCII and thus make the code more portable.