Question

1. Rewrite the program you submitted for A8 to use pointers, pointer notation and arithmetic, etc. as follows:
   • If you did not complete A8, you will need to start with those instructions, and then, change your code based on the instructions here
   • The main() function should:
     • Create a fixed or dynamic array, e.g., double grade[SIZE] or double *grade = malloc(...) or calloc(...)
     • Concerning the function call for getData(), pass the address of the array and its size to pointers; depending on how you change your program, it may or may not return something, but if it does, it should return an address. i.e., a pointer

Here is

1. • • Concerning the function call for displayData(), pass the address of the array and its size to pointers, and return nothing
     • Use the final for loop, which displays the contents of the array again without using displayData(), to demonstrate one of the ways, you can use pointers to manipulate an array; see below for more information
   • The for loops, inside of the getData() and displayData() functions, should use different ways to demonstrate how to manipulate an array, e.g., p < q vs. p + i < p + size, or whatever; see the Notes - Pointers and second video in C10, if necessary
   • Your grade will be better, if your code thoroughly demonstrates using pointers, and pointer notation and arithmetic, and follows the Code Conventions, etc.
2. Make sure your program thoroughly follows the Code Conventions, including tabs, not multiple spaces, appropriate comments at the top, PPR comments above the function definitions, heading type comments and single blank lines throughout your code to group and organize your code, e.g., // Prototypes, // Input, // Output, etc

Here is Assignment A8 for reference.

1. Above main(), where appropriate, create a constant for the size of the array in step 2.
2. In main(), create an array called grade using the constant from step 1 and initialize it to zero.
3. Below main(), create a function called getData(), which takes and processes an array called array along with its size, and fills it with numbers given by the user. Use an array reference, not a pointer, and do NOT use a constant for this function. Also, the function does not return anything.
4. In main(), call getData() passing the grade array and its size to the function.
5. Below main(), create a function called displayData(), which takes and processes an array called array along with its size, and retrieves and displays the values from the array to the screen formatted professionally with decimal points aligned if appropriate. Use an array reference, not a pointer, and do NOT use a constant for this function. Also, the function does not return anything.
6. In main(), call displayData() passing the grade array and its size to the function.
7. In main(), using a for loop, display the data in the grade array. Do NOT use the function displayData() for this step.

Answer 1

Program code to copy

//header files
#include <iostream>
#include <iomanip>
using namespace std;

//*******************************************************************************************************
//function prototypes
void getData(int *, const int);
void displayData(int *, const int);

//*******************************************************************************************************
//main function
int main()
{
   //constant variable
   const int SIZE = 10;

   //declare local variable
   int grades[SIZE];

   int * ptData = grades;

   //calling a function
   getData(ptData, SIZE);

   displayData(ptData, SIZE);

   //return value          
   return 0;
}

//*******************************************************************************************************
// pass the address of the array and its size to pointers
void getData(int * data, const int SIZE)
{
   cout << "Please enter grades for the 10 assignments." << endl;
  
   //using for loop for accessing a input data
   for (int i = 0; i < SIZE; i++)
   {
       do
       {
           //asking user to enter a grade
           cout << "Grade " << i + 1 << ": ";
           cin >> *(data + i);

           // if the grade value is less than zero or greater than 100 then it will display error message using if loop
           if (*(data + i) < 0 || *(data + i) > 100)
               cout << "ERROR: Grades cannot be less than 0 or more than 100" << endl;
       } while (*(data + i) < 0 || *(data + i) > 100);
   }

   cout << endl;
}

//*******************************************************************************************************
// display all the grades which the user enters
void displayData(int * data, const int SIZE)
{
   cout << "All grades entered:" << endl;

   //using for loop ,which displays the contents of the array
   for (int i = 0; i < SIZE; i++)
   {
       cout << left << setw(5) << *(data + i);
   }
  
   cout << endl << endl;
}

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Program Screenshot

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