c++The Lock class of the preceding problem has a small problem. It does not support combinations that start with one or more zeroes. For example, a combination of 0042 can be opened by entering just 42.Solve this problem by choosing a different representation. Instead of an integer, use a string to hold the input.Once again, the combination is hardwired. You will see in Section 9.6 how to change it.Complete the following file: 1#include 2 #include 3 using namespace std;45 /**6.A simulated lock with digit buttons.7*/8.class Lock9 {10 public:11/**Simulates a digit button push.@param button a digit 012139.14*/15void push(int button);1617/**Simulates a push of the open button.@return true if the lock opened181920*/21bool open();22 private:"0042";string combination =string input;232425 };26void Lock::push(int button)28 {2729string button_as_stringto_string(button);%3D3031 }3233 bool Lock::open(){343536 }3738int main()39 {40Lock my_lock;my_lock.push(4);my_lock.push(2);cout <« boolalpha;cout <« my_lock.open() << endl;cout <« "Expected: false" « endl;my_lock.push(0);my_lock.push(0);my_lock.push(4);my_lock.push(2);cout <« my_lock.open() << endl;cout <« "Expected: true" « endl;my_lock.push(0);my_lock.push(4);my_lock.push(2);cout <« my_lock.open() << endl;cout <« "Expected: false" « endl;my_lock.push(0);my_lock.push(0);my_lock.push(0);my_lock.push(4);my_lock.push(2);414243444546474849505152535455565758596061 cout « my_lock.open() « endl;cout <« "Expected: false" « endl;my_lock.push(0);my_lock.push(0);my_lock.push(4);my_lock.push(2);cout <« my_lock.open() << endl;cout <« "Expected: true" <« endl;return 0;62636465666768697071 }

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Answered: c++ The Lock class of the preceding…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

c++

The Lock class of the preceding problem has a small problem. It does not support combinations that start with one or more zeroes. For example, a combination of 0042 can be opened by entering just 42.

Solve this problem by choosing a different representation. Instead of an integer, use a string to hold the input.

Once again, the combination is hardwired. You will see in Section 9.6 how to change it.

Complete the following file:

1
#include <iostream>
2 #include <string>
3 using namespace std;
4
5 /**
6.
A simulated lock with digit buttons.
7
*/
8.
class Lock
9 {
10 public:
11
/**
Simulates a digit button push.
@param button a digit 0
12
13
9.
14
*/
15
void push(int button);
16
17
/**
Simulates a push of the open button.
@return true if the lock opened
18
19
20
*/
21
bool open();
22 private:
"0042";
string combination =
string input;
23
24
25 };
26
void Lock::push(int button)
28 {
27
29
string button_as_string
to_string(button);
%3D
30
31 }
32
33 bool Lock::open()
{
34
35
36 }
37
38
int main()
39 {
40
Lock my_lock;
my_lock.push(4);
my_lock.push(2);
cout <« boolalpha;
cout <« my_lock.open() << endl;
cout <« "Expected: false" « endl;
my_lock.push(0);
my_lock.push(0);
my_lock.push(4);
my_lock.push(2);
cout <« my_lock.open() << endl;
cout <« "Expected: true" « endl;
my_lock.push(0);
my_lock.push(4);
my_lock.push(2);
cout <« my_lock.open() << endl;
cout <« "Expected: false" « endl;
my_lock.push(0);
my_lock.push(0);
my_lock.push(0);
my_lock.push(4);
my_lock.push(2);
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cout « my_lock.open() « endl;
cout <« "Expected: false" « endl;
my_lock.push(0);
my_lock.push(0);
my_lock.push(4);
my_lock.push(2);
cout <« my_lock.open() << endl;
cout <« "Expected: true" <« endl;
return 0;
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71 }

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