Answered: // The language is c++ //please…

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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// The language is c++

//please explain step by step

By using vector handle dynamic, and for loop to print this message separately in each line.

"This is C++ code with no commas semicolons of fullstops:;

Expert Solution

Step 1

NOTE: - To clearly demonstrating the concept, the size of the vector is printed at multiple places.

EXPLANATION: -

Defining Vector Dynamically: -

vector<string>* myVector = new vector<string>(5);

The above line dynamically creates and initializes the vector named myVector with 5 empty strings.
Right now myVector is already having 5 elements.
Vector is dynamic in nature, it automatically increases its size when more elements are added to it.
The size function on myVector gives the current size of the vector. Since it is a pointer, so arrow pointer is used to access the method
- cout<<"vector size: "<< myVector->size() <<endl;
Any push_back operation will result in an increment in the size of the vector named myVector.

push_back function: -

This function adds elements at end of the vector, and each operation increments the vector size by 1.
- myVector->push_back(message);//message is added at index 5
- Vector also follows zero-based indexing.
A total of 5 push_back operations are performed.
Hence, the vector size becomes 10 now.

Now vector contains 5 empty strings, and 5 messages, a total of 10 elements.

Displaying the vector: -

The vector elements are printed using for loop which runs from index 0 till the size of the vector - 1 that is 9.
To access the element of the vector, dereferencing is required, since it is a pointer.
- First, the vector variable myVector is dereferenced, then the element present at the index variable i is stored in variable myStringusing the rectangular brackets.
  - string myString = (*myVector)[i];
Initially, there are five empty strings, so to prevent printing the empty strings, if the condition is applied, only if the string is not empty, it is printed on the console.

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