Thread: Recursion Function Problem

Code:

#include <cstdlib> 
#include <ctime>
#include <iomanip>
#include <iostream>

using namespace std; // prototype and name space declaration
int sqr(int);
int cube(int);
int fourth(int);
int fifth(int);

bool printNum();
void show(int (*fn)(int), int); 

//------------------------------------------------------------------
//------------------------------------------------------------------
//------------------------------------------------------------------

void main()
{	
	
	while(printNum())
		;

}
//------------------------------------------------------------------
//------------------------------------------------------------------
//------------------------------------------------------------------

bool printNum()
{
	char input;
	int block =0;
	
	cout<< "To Square Enter:           S"<<endl;
	cout<< "To Cube Enter:             C"<<endl;
	cout<< "To the Fourth Power Enter: F"<<endl;
	cout<< "To the Fifth Power Enter:  H"<<endl;
	cout<< "To Quit: Q"<<endl;
	cin >> input;
	
	while ( input != 's' && input != 'S'
			 && input != 'c' && input != 'C'
			  && input != 'f' && input != 'F'
			   && input != 'h' && input != 'H'
			    && input != 'q' && input != 'Q')
	{		

		cout << "Wrong Choice.\n";
		cout << "Enter Again: ";
		cin.clear();
		cin.ignore(80,'\n');
		cin >> input;
	}
	
          if ( input == 'q' || input =='Q')
			{
			cout << "Program Ended. "<<endl;
			return 0;
				
				}
	while (true)

		{

			int lowVal ,maxVal;


			cout <<"Enter A Number For Low Bound: ";
			cin >> lowVal;
			
			cout <<"Enter A Number For Low Bound: ";
			cin >> Val;
		
			if ( input == 'q' || input =='Q')
				{
				cout << "Program Ended. "<<endl;
				return 0;
				
				}
			if ( (lowVal == 0 && maxVal == 0))
				printNum();

			cout <<"\n";
			cout <<"Printing "<<(maxVal-lowVal)+1<<" numbers"<<endl;
			cout <<"\n";

			for (int x = lowVal; lowVal<=maxVal; lowVal++)
			{
				switch (input)
				{
				case 's':
					{
					cout.setf(ios::left);
					cout<< setw(5);
					show(sqr, lowVal);
					block++;
					break;
					}

				case 'S':
					{
					cout.setf(ios::left);
					cout<< setw(5);
					show(sqr, lowVal);
					block++;
					break;
					}
				case 'c':
					{
					cout.setf(ios::left);
					cout<< setw(5);
					show(cube, lowVal);
					block++;
					break;
					}

				case 'C':
					{
					cout.setf(ios::left);
					cout<< setw(5);
					show(cube, lowVal);
					block++;
					break;
					}
								
				case 'f':
					{
					cout.setf(ios::left);
					cout<< setw(8);
					show(fourth, lowVal);
					block++;
					break;
					}

				case 'F':
					{
					cout.setf(ios::left);
					cout<< setw(8);
					show(fourth, lowVal);
					block++;
					break;
					}
				case 'h':
					{
					cout.setf(ios::left);
					cout<< setw(8);
					show(fifth, lowVal);
					block++;
					break;
					}

				case 'H':
					{
					cout.setf(ios::left);
					cout<< setw(8);
					show(fifth, lowVal);
					block++;
					break;
					}

				}

				if (block == 10)
				{
					block = 0;
					cout<<"\n";
				}
			}
			cout <<"\n";
			block = 0;
			
	}

   
}
//------------------------------------------------------------------
//------------------------------------------------------------------
//------------------------------------------------------------------
int sqr(int num) // list of functions 
{
    return num * num;
}

int cube(int num) // this one is to cube
{
    return num * num * num;
}
int fourth(int num)
{
    return num * num * num * num;
}
int fifth(int num)
{
    return num * num * num * num * num;
}

void show(int (*fn)(int), int num) // pointer
{
    cout << fn(num);
}