Implement a function called payroll() that takes two string parameters the first of which represents the name of an input file and the second of which represents the name of an output file. The input file contains lines with the following format: hours pay_rate where hours is an integer representing a number of hours worked and pay_rate is a floating point value representing the pay rate per hour. There will be some whitespace between the two values, although you may not make any assumptions about how much or what type. The function reads the input file line by line, computing the total pay (i. e. the product of the hours times the pay_rate -- we are not assuming overtime is computed for any of the values) and writing each amount to a newline in the output file. If the file is empty, the function should not write any numbers to the output file. Note that the strings read from the file will need to be evaluated before you can use them for computations. The following shows what the function would return when called on several sample files found in the zip file containing the assignment. The output files produced are also in the zip file

Lisa has a section of her document that she would like to include in the index. which option should lisa choose? mark index mark entry insert endnote add text

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';

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