Let L1 and L2 be two languages produced by grammars of a certain type. Let L be the language which is the concatenation of L1 and L2. We want to tell for various types of grammars that produce L1 and L2 what type is the concatenation L. Choose the triple (type1, type2, type3) so that when the grammar that produces the language L1 is of type1 and the grammar that produces the language L2 is of type2, then the grammar that produces the concatenation language L may not be of type3.Note: A linear grammar is a context-free grammar in which no production body has more than one occurrence of one variable. For example, A → 0B1 or A → 001 could be productions of a linear grammar, but A → BB or A → A0B could not. A linear language is a language that has at least one linear grammar. a) (regular, regular, context-free)b) (linear, regular, linear)c) (regular, linear, regular)d) (regular, regular, linear)

We as humans write math expression in infix notation, e.g. 5 + 2 (the operators are written in-between the operands). in a computer’s language, however, it is preferred to have the operators on the right side of the operands, i.e. 5 2 +. for more complex expressions that include parenthesis and multiple operators, a compiler has to convert the expression into postfix first and then evaluate the resulting postfix.write a program that takes an “infix” expression as input, uses stacks to convert it into postfix expression, and finally evaluates it. it must support the following operations: + - / * ^ % (example infix expression: (7 - 3) / (2 + 2)postfix expression: 7 3 - 2 2 + /result: 1guidelines: 1. you will need to use stacks in three placesa. one for the parenthesis check [char stack]b. one during infix to postfix [char stack]c. one during evaluation [int stack]for a and b above, you can use same array and same push, pop method as both ofthem are char. but for evaluation you have int stack and you might consider to createanother push pop method to handle it. maybe push_int, pop_int, etc. or find otherstrategy to utilize existing push pop method2. you can create a function for obtaining operator priority. that function should take anoperator as input and return its priority as an integer. this function will you a lot andreduce repeated code3. during evaluation you will need to convert char into integer. example for single digit: char c = '5'; int x = c - '0';

Experimental data that is expressed using numbers is said to be

Font size, font style, and are all aspects of character formatting.