I need help filling in the DO_#\'s: i.e. DO_2, DO_3, DO_4, etc... fill in the bl

Question

I need help filling in the DO_#'s: i.e. DO_2, DO_3, DO_4, etc... fill in the blanks/ missing parts of the program (in bold)


//-----------------------------------------------------------------------
//
// // Purpose: This program reads in four characters and then
// prints them out in a rotated pattern. When done rotating
// the four characters, it will read another four characters
// and rotate them. It repeats this process of reading and
// rotating until end-of-file
//
// Input : Four characters c1, c2, c3, and c4.
//
// Output : The four character in a rotated pattern. For example, if
// the characters are A B C D the output is:
// ABCD
// BCDA
// CDAB
// DABC
//
//-----------------------------------------------------------------------

#include <iostream>
using namespace std;

const int NUM_STEPS = 4; // number of rotation steps to perform

void DisplayRotationPattern(char c1, char c2, char c3, char c4);
void DisplayFourChars(char c1, char c2, char c3, char c4);

// DO_2: Complete the following function prototype.
// This function "rotates" four characters c1, c2, c3, and c4.
// That is, it puts c2 in c1, c3 in c2, c4 in c3, and c1 in c4.

void RotateFourChars( );



int main()
{
char ch1, ch2, ch3, ch4;

cout << "Enter four characters: ";
cin >> ch1 >> ch2 >> ch3 >> ch4;

while( cin )
{
cout << "The Rotation patterns are:" << endl;

// DO_3: Call DisplayRotationPattern

cout << ch1 << ch2 << ch3 << ch4;

cout << "Enter four characters: ";
cin >> ch1 >> ch2 >> ch3 >> ch4;
}

return 0;
}


//-----------------------------------------------------------------------
// This function displays the four characters passed to it
// in a rotated pattern.
// params: (in, in, in, in)
//-----------------------------------------------------------------------
void DisplayRotationPattern(char c1, char c2, char c3, char c4)
{
int count = 1;
while (count <= NUM_STEPS)
{
// DO_4: Call function to display the characters



cout << endl;



// DO_5: Call function to rotate the characters



count ++;
}

}

//-----------------------------------------------------------------------
// This function "rotates" four characters c1, c2, c3, and c4.
// That is, it puts c2 in c1, c3 in c2, c4 in c3, and c1 in c4.
// params: (inout, inout, inout, inout)
//-----------------------------------------------------------------------
//
// DO_6: Write the function header
void RotateFourChars( )
{

// DO_7: Write the function body.





}

//-----------------------------------------------------------------------
// This function has four input parameters, each of them is a character.
// The function displays the four characters at the beginning of a line.
// params: (in, in, in, in)
//-----------------------------------------------------------------------
void DisplayFourChars(char c1, char c2, char c3, char c4)
{

// DO_8: Write function body







}

Explanation / Answer

//-----------------------------------------------------------------------
//
// // Purpose: This program reads in four characters and then
// prints them out in a rotated pattern. When done rotating
// the four characters, it will read another four characters
// and rotate them. It repeats this process of reading and
// rotating until end-of-file
//
// Input : Four characters c1, c2, c3, and c4.
//
// Output : The four character in a rotated pattern. For example, if
// the characters are A B C D the output is:
// ABCD
// BCDA
// CDAB
// DABC
//
//-----------------------------------------------------------------------

#include <iostream>
using namespace std;

const int NUM_STEPS = 4; // number of rotation steps to perform

void DisplayRotationPattern(char c1, char c2, char c3, char c4);
void DisplayFourChars(char c1, char c2, char c3, char c4);

// DO_2: Complete the following function prototype.
// This function "rotates" four characters c1, c2, c3, and c4.
// That is, it puts c2 in c1, c3 in c2, c4 in c3, and c1 in c4.

//pass c1 c2 c3 c4 by reference
void RotateFourChars(char &c1, char &c2, char &c3, char &c4);


int main()
{
   char ch1, ch2, ch3, ch4;

   cout << "Enter four characters: ";
   cin >> ch1 >> ch2 >> ch3 >> ch4;

   while( cin )
   {
      cout << "The Rotation patterns are:" << endl;

      // DO_3: Call DisplayRotationPattern
      DisplayRotationPattern(ch1, ch2, ch3, ch4);

      cout << ch1 << ch2 << ch3 << ch4;

      cout << endl << endl;
      cout << "Enter four characters: ";
      cin >> ch1 >> ch2 >> ch3 >> ch4;
   }

   return 0;
}


//-----------------------------------------------------------------------
// This function displays the four characters passed to it
// in a rotated pattern.
// params: (in, in, in, in)
//-----------------------------------------------------------------------
void DisplayRotationPattern(char c1, char c2, char c3, char c4)
{
   int count = 1;
   while (count <= NUM_STEPS)
   {
      // DO_4: Call function to display the characters
      DisplayFourChars(c1, c2, c3, c4);

      cout << endl;

      // DO_5: Call function to rotate the characters
      RotateFourChars(c1, c2, c3, c4);

      count ++;
   }
}

//-----------------------------------------------------------------------
// This function "rotates" four characters c1, c2, c3, and c4.
// That is, it puts c2 in c1, c3 in c2, c4 in c3, and c1 in c4.
// params: (inout, inout, inout, inout)
//-----------------------------------------------------------------------
//
// DO_6: Write the function header
void RotateFourChars(char &c1, char &c2, char &c3, char &c4)
{
   // DO_7: Write the function body.
   char temp = c1; //you need a temporary character to store c1 before assign c2 to c1 so that you can assign c1 to c4 later
   c1 = c2;
   c2 = c3;
   c3 = c4;
   c4 = temp;
}

//-----------------------------------------------------------------------
// This function has four input parameters, each of them is a character.
// The function displays the four characters at the beginning of a line.
// params: (in, in, in, in)
//-----------------------------------------------------------------------
void DisplayFourChars(char c1, char c2, char c3, char c4)
{
   // DO_8: Write function body
   cout << c1 << c2 << c3 << c4;
}

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