Write a program to compare the performance of the lru and the optimal page replacement algorithms. the program will take a reference string and the number of frames as inputs. assume the maximum length of a reference string is 20 and there are 5 diffent pages from page 1 to page 5. the reference string can be randomly generated and the number of frames is entered through the keyboard. for example, the system generates a reference string 2 1 3 4 5 2 3 and you enter the number of frames 3. compare the number of page faults generated by the optimal and lru algorithms. print out the page replacement process and you can see how lru differs from the optimal.

Which law requires employers to provide safe working environments for their employees? a. civil rights act b. fair labor standards act c. occupational safety and health act d. wagner act

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';

Me and category do i put them in because this is science