C++Define an "Expression" class that manages expression info: operand1 (integer), operand2 (integer), and the expression operator (char). It must provide at least the following method:- toString() to return a string containing all the expression info such as 50 + 50 = 100Write a command-driven program named "ListExpressions" that will accept the following commands:add, listall, listbyoperator, listsummary, exit"add" command will read the expression and save it away in the list"listall" command will display all the expressions"listbyoperator" command will read in the operator and display only expressions with that given operator"listsummary" command will display the total number of expressions, the number of expressions for each operator, the largest and smallest expression values"exit" command will exit the programRequirements:- It must be using the array of pointers to Expression objects to manage the list of Expression objects. Please predefine the size of the array to start at 10. Every time, the array is full, please allocate a new array with 10 more, copy the original array to the new one and free the original one.- There should be no global variables.- No - scanf and printf, please use cin, cout and C++ formatting)- Should handle error conditions when the user enters invalid operators, invalid operands, and invalid commands.- It should display "There is no expression." when no expression is in the list.- When the user enters "listbyoperator" command and there is no matched expression, it should display a "No expression is found with the operator: " message such as "No expression is found with the operator: @"- Each expression must be stored in its own Expression object.The expected output is attached. Welcome to expression management program.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallThere is no expression.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorThere is no expression.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryThere is no expression.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listUnsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): quitUnsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:10+ 201030Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 * 01*0Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallAll expressions:1020Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryTotal number of expressions: 2Number of '+ expressions: 1Number of '-' expressions: 0Number of '*' expressions: 1Number of '/' expressions:0Number of '%' expressions:030020eLargest expression:Smallest expression:Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:9 * 595Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:20112011200Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:11 % 311%3Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:20111abc + 5Invalid operand. Number is expected.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:5 * abc0Invalid operand. Number is expected.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 % 23001%2Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 ? 2%Unsupported expression operator.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 $2Unsupported expression operator.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallAll expressions:10192004532205Largest expression:Smallest expression:1Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:32119Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:%Number of '+ expressions: 1expressions: 1Number of '-'Number of '*' expressions: 2Number of '/' expressions: eNumber of '%' expressions: 220002011200Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:%3004520021111Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:2005045?No expression is found with the operator: ?Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:$No expression is found with the operator: $Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryTotal number of expressions: 621Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:-1 1-11-1Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:300 * 13001300Please enter a command (add, listall, listbyoperator, listsummary, and exit): listUnsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallAll expressions:1019201111-1300Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryTotal number of expressions: 8Number of '+' expressions: 1Number of expressions: 1Number of *** expressions: 4Number of '/' expressions:Number of '%' expressions: 2Largest expression:Smallest expression:300-1Please enter a command (add, listall, listbyoperator, listsummary, and exit): quit3004520021-1300Unsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): exitThank you. Goodbye.

Question

C++Define an &#34;Expression&#34; class that manages expression info: operand1 (integer), operand2 (integer), and the expression operator (char). It must provide at least the following method:- toString() to return a string containing all the expression info such as        50         +        50        =         100Write a command-driven program named &#34;ListExpressions&#34; that will accept the following commands:add, listall, listbyoperator, listsummary, exit&#34;add&#34; command will read the expression and save it away in the list&#34;listall&#34; command will display all the expressions&#34;listbyoperator&#34; command will read in the operator and display only expressions with that given operator&#34;listsummary&#34; command will display the total number of expressions, the number of expressions for each operator, the largest and smallest expression values&#34;exit&#34; command will exit the programRequirements:- It must be using the array of pointers to Expression objects to manage the list of Expression objects. Please predefine the size of the array to start at 10. Every time, the array is full, please allocate a new array with 10 more, copy the original array to the new one and free the original one.- There should be no global variables.- No - scanf and printf, please use cin, cout and C++ formatting)- Should handle error conditions when the user enters invalid operators, invalid operands, and invalid commands.- It should display &#34;There is no expression.&#34; when no expression is in the list.- When the user enters &#34;listbyoperator&#34; command and there is no matched expression, it should display a &#34;No expression is found with the operator: <search-operator>&#34; message such as &#34;No expression is found with the operator: @&#34;- Each expression must be stored in its own Expression object.The expected output is attached. Welcome to expression management program.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallThere is no expression.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorThere is no expression.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryThere is no expression.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listUnsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): quitUnsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:10+ 201030Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 * 01*0Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallAll expressions:1020Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryTotal number of expressions: 2Number of '+ expressions: 1Number of '-' expressions: 0Number of '*' expressions: 1Number of '/' expressions:0Number of '%' expressions:030020eLargest expression:Smallest expression:Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:9 * 595Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:20112011200Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:11 % 311%3Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:20111abc + 5Invalid operand. Number is expected.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:5 * abc0Invalid operand. Number is expected.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 % 23001%2Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 ? 2%Unsupported expression operator.Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:1 $2Unsupported expression operator.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallAll expressions:10192004532205Largest expression:Smallest expression:1Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:32119Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:%Number of '+ expressions: 1expressions: 1Number of '-'Number of '*' expressions: 2Number of '/' expressions: eNumber of '%' expressions: 220002011200Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:%3004520021111Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:2005045?No expression is found with the operator: ?Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperatorPlease enter the operator:$No expression is found with the operator: $Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryTotal number of expressions: 621Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:-1 1-11-1Please enter a command (add, listall, listbyoperator, listsummary, and exit): addPlease enter an expression:300 * 13001300Please enter a command (add, listall, listbyoperator, listsummary, and exit): listUnsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): listallAll expressions:1019201111-1300Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummaryTotal number of expressions: 8Number of '+' expressions: 1Number of expressions: 1Number of *** expressions: 4Number of '/' expressions:Number of '%' expressions: 2Largest expression:Smallest expression:300-1Please enter a command (add, listall, listbyoperator, listsummary, and exit): quit3004520021-1300Unsupported command. Please try again.Please enter a command (add, listall, listbyoperator, listsummary, and exit): exitThank you. Goodbye.

Accepted Answer

Algorithm: Expression Management System1. Include the necessary C++ libraries: <iostream>,…