/********************************************************************
My simple calculator.
In this file are methods of Class 'Symbol_table'.
********************************************************************/
//-------------------------------------------
#include "std_lib_facilities.h"
//-------------------------------------------
#include "header.h"
//-------------------------------------------
using namespace std;
//-------------------------------------------
/********************************************
User commands 'info', 'help'.
********************************************/
// Information function to display
// help information on the screen
void Symbol_table::variable_info( )
{
cout << "\n------------------------------------------\n"
<< "\nIn this calculator you can use:"
<< "\n1. Floating point numbers."
<< "\n2. Following operators: "
<< "\n '+' - sum,"
<< "\n '-' - difference,"
<< "\n '*' - multiplication,"
<< "\n '/' - division,"
<< "\n '%' - modulo,"
<< "\n '!' - factorial an expression,"
<< "\n '=' - an assignment "
<< "\n (to the left of equal "
<< "\n sign variable) or "
<< "\n comparison (if the left "
<< "\n number of expression)."
<< "\n3. Braces: "
<< "\n '{...}' - figure (priority),"
<< "\n '(...)' - round."
<< "\n4. Any custom variables"
<< "\n starting with Latin letters"
<< "\n containing Latin letters,"
<< "\n numbers and underscope,"
<< "\n in particular, constant variables:"
<< "\n 'pi' - number pi (3.1415926535),"
<< "\n 'e' - number e (2.7182818284)."
<< "\n5. Function:"
<< "\n 'sqrt(...)' - calculating "
<< "\n the square root,"
<< "\n 'pow(.,.)' - number raised "
<< "\n to a power,"
<< "\n 'info', 'help' - getting help."
<< "\nPress 'Space' to separate solutions."
<< "\nPress 'Enter' to execute commands."
<< "\n\n------------------------------------------\n"
<< "\n\n";
}
//-------------------------------------------
/********************************************
Methods of interaction
width the user variables.
********************************************/
//-------------------------------------------
// Initialization of predefined variables
void Symbol_table::var_table_intial_value()
{
//Variables v;
// Number Pi (const)
var_table_push_back( "pi", 3.1415926535 );
// Number e (const)
var_table_push_back( "e", 2.7182818284 );
// Function sqrt (const)
var_table_push_back( "sqrt", 0 );
// Function pow (const)
var_table_push_back( "pow", 0 );
// Constant for the output
// of help information to the screen
var_table_push_back( "info" );
var_table_push_back( "help" );
}
//-------------------------------------------
// Adding and editing user-defined variables
void Symbol_table::var_table_push_back( const string &name, double value )
{
bool yesvar = false;
for( int i = 0 ; i < var_table.size() ; ++i ){
if( var_table[i].name == name ){
yesvar = true;
var_table[i].value = value;
}
}
if( yesvar == false ){
Variables v;
v.name = name;
v.value = value;
var_table.push_back(v);
}
}
//-------------------------------------------
// Adding and editing user-defined variables
void Symbol_table::var_table_push_back( const string &name )
{
bool yesvar = false;
for( int i = 0 ; i < var_table.size() ; ++i ){
if( var_table[i].name == name ){
yesvar = true;
}
}
if( yesvar == false ){
Variables v;
v.name = name;
var_table.push_back(v);
}
}
//-------------------------------------------
// Search the variables in the vector. Option 1
double Symbol_table::get_variable_value( const string &s )
{
for( Variables vars : var_table ){
if( vars.name == s ) return vars.value;
}
error( "get: not variable! ", s );
}
//-------------------------------------------
// Search the variables in the vector. Option 2
double Symbol_table::set_variable_value( const string &s )
{
for( Variables vars : var_table ){
if( vars.name == s ) return vars.value;
}
return 0;
}
//-------------------------------------------
// Search the variables in the vector and write new variables in the vector. Option 3
double Symbol_table::set_variable_value( const string &s, double d )
{
for( Variables vars : var_table ){
if( vars.name == s ) return vars.value;
}
Variables v;
v.name = s;
v.value = d;
var_table.push_back(v);
return v.value;
}
//-------------------------------------------
// Display the contents of vector variable "var_table"
void Symbol_table::var_table_cout()
{
cout << '\n';
cout << "var_table.size() = " << var_table.size();
cout << '\n';
for( int i = 0 ; i < var_table.size() ; ++i ){
cout << var_table[i].name << " = " << var_table[i].value << '\n';
}
cout << '\n';
}
//-------------------------------------------
