Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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 = 100
Write a command-driven
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 program
Requirements:
- It must be using the array of pointers (not
- 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: <search-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.
Transcribed Image Text:Welcome to expression management program.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listall
There is no expression.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperator
There is no expression.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummary
There is no expression.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): list
Unsupported command. Please try again.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): quit
Unsupported command. Please try again.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
10+ 20
10
30
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
1 * 0
1
*
0
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listall
All expressions:
10
20
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummary
Total number of expressions: 2
Number of '+ expressions: 1
Number of '-' expressions: 0
Number of '*' expressions: 1
Number of '/' expressions:
0
Number of '%' expressions:
0
30
0
20
e
Largest expression:
Smallest expression:
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
9 * 5
9
5
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
2011
201
1
200
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
11 % 3
11
%
3
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
201
11
abc + 5
Invalid operand. Number is expected.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
5 * abc
0
Invalid operand. Number is expected.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
1 % 2
30
0
1
%
2
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
1 ? 2
%
Unsupported expression operator.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
1 $2
Unsupported expression operator.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listall
All expressions:
10
1
9
20
0
45
3
2
2
0
5
Largest expression:
Smallest expression:
1
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperator
Please enter the operator:
3
2
1
1
9
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperator
Please enter the operator:
%
Number of '+ expressions: 1
expressions: 1
Number of '-'
Number of '*' expressions: 2
Number of '/' expressions: e
Number of '%' expressions: 2
200
0
201
1
200
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperator
Please enter the operator:
%
30
0
45
200
2
1
11
1
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperator
Please enter the operator:
20
0
5
0
45
?
No expression is found with the operator: ?
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listbyoperator
Please enter the operator:
$
No expression is found with the operator: $
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummary
Total number of expressions: 6
2
1
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
-1 1
-1
1
-1
Please enter a command (add, listall, listbyoperator, listsummary, and exit): add
Please enter an expression:
300 * 1
300
1
300
Please enter a command (add, listall, listbyoperator, listsummary, and exit): list
Unsupported command. Please try again.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listall
All expressions:
10
1
9
201
11
1
-1
300
Please enter a command (add, listall, listbyoperator, listsummary, and exit): listsummary
Total number of expressions: 8
Number of '+' expressions: 1
Number of expressions: 1
Number of *** expressions: 4
Number of '/' expressions:
Number of '%' expressions: 2
Largest expression:
Smallest expression:
300
-1
Please enter a command (add, listall, listbyoperator, listsummary, and exit): quit
30
0
45
200
2
1
-1
300
Unsupported command. Please try again.
Please enter a command (add, listall, listbyoperator, listsummary, and exit): exit
Thank you. Goodbye.
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