Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 7 Exercise 8
Using std_lib_facilities.h by Bjarne Stroustrup.
[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 7 Exercise 8
/*
Simple calculator
Revision history:
Revised by Philipp Siedler May 2017
Revised by Bjarne Stroustrup November 2013
Revised by Bjarne Stroustrup May 2007
Revised by Bjarne Stroustrup August 2006
Revised by Bjarne Stroustrup August 2004
Originally written by Bjarne Stroustrup
(bs@cs.tamu.edu) Spring 2004
This program implements a basic expression calculator.
Input from cin; output to cout;
The grammar for input is:
Calculation:
Statement
Print
Quit
Help
Calculation Statement
Statement:
Declaration
Expression
Declaration:
"let" Name "=" Expression
"const" name "=" Expression
Name:
letter
letter Sequence
Sequence:
letter
digit
"_"
letter Sequence
digit Sequence
"_" Sequence
Print:
";" or ‘\n’
Quit:
"quit"
Help
"help" or "Help"
Expression:
Term
Expression + Term
Expression – Term
Term:
Primary
Term * Primary
Term / Primary
Term % Primary
Primary:
Number
"(" Expression ")"
"-" Primary
"+" Primary
"sqrt(" Expression ")"
"pow(" Expression "," Integer ")"
Name
Name "=" Expression
Number:
floating-point-literal
Input comes from cin through the Token_stream called ts.
*/
[/code]
