Step 1: #include <iostream> #include <string> using namespace std; struct studen

Question

Step 1:

#include <iostream>

#include <string>

using namespace std;

struct student_record

{

      string name;

      double age;

      char sex;

};

int main()

{

      student_record Student_DB[3] = {"Lofton",53,'M',"Thomas",55,'M',

                                    "Tami",25,'F'};

      cout << endl;

      for (int i=0; i<3; i++)

      { cout << Student_DB[i].name << " "

                 << Student_DB[i].age <<" "

                 << Student_DB[i].sex << endl << endl;

      }

      Student_DB[0].name = "William";

      Student_DB[2].age = 100;

      Student_DB[1].sex = 'F';

      cout << "+++++++++++++++++++++++++++++++ ";

      cout << endl;

      for (int i=0; i<3; i++)

      {

            cout << Student_DB[i].name << " "

                 << Student_DB[i].age << " "

                 << Student_DB[i].sex << endl << endl;

      }

      return 0;

      }

Question 1:Please explain how the array

Explanation / Answer

Step 1 :

Answer 1 : The Array has been initialized as a static array of structures. It assings the three input of structures into indices 0, 1 and 2 as complete records.

Answer 2 : The first For loop Prints the record of all the three students one by one . as :

"Lofton",53,'M',

"Thomas",55,'M',

"Tami",25,'F'

the second for loop only prints one record as the array definedd for it does not hold different records but only different elements of the single record..

Student_DB[0].name = "William";

Student_DB[2].age = 100;

Student_DB[1].sex = 'F';

the output wil be "William","100","F".

Step 2:

Answer 3 : In Step 2 the array initialization is dynamic. whereas the array in step 1 it was static. In step 2 the records are entered one by one individually in indice 0 1 and 2.

Answer 4:

tatic arrays are created on the stack, and necessarily have a fixed size (the size of the stack needs to be known going into a function):

student_record Student_DB[3] = {"Lofton",53,'M',"Thomas",55,'M',"Tami",25,'F'};

Dynamic arrays are created on the heap. They can have any size, but you need to allocate and free them yourself since they're not part of the stack frame:

You don't need to deal with the memory management of a static array, but they get destroyed when the function they're in ends

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