7) Write a C++ program on Dynamic initialization and Default arguments in Constructors.

source file name: defaultconst.cpp 

#include<iostream.h>

#include<conio.h>

class FDAmount

{

long pamt;

int yrs;

float rt;

float amount;

public:

FDAmount(){}

FDAmount(long p, int y, float r=0.12);

FDAmount(long p, int y, int r);

void display()

{

cout<<"\n" << "Principal Amount= " << pamt;

cout<<"\n "<<" Return value= "<<amount;

}

};

FDAmount::FDAmount(long p, int y, float r)

{

pamt=p;

yrs=y;

rt=r;

amount=pamt;

for(int n=1;n<=y;n++)

amount=amount*(1.0f+r);

}

FDAmount::FDAmount(long p, int y, int r)

{

pamt=p;

yrs=y;

rt=r;

amount=pamt;

for(int n=1;n<=y;n++)

amount=amount*(1.0+float(r)/100);

}

void main()

{

FDAmount FD1,FD2,FD3;

clrscr();

long p;

int y;

float r;

int R;

      cout<<" enter amount, period , rate(in percent) \n";

      cin>>p>>y>>R;

      FD1=FDAmount(p,y,R);

      cout<<" enter amount, period , rate(in decimal) \n";

      cin>>p>>y>>r;

      FD2=FDAmount(p,y,r);

      cout<<" enter amount, period  \n";

      cin>>p>>y;

      FD3=FDAmount(p,y);

      cout<<"\n Deposit 1: ";

      FD1.display();

      cout<<"\n Deposit 2: ";

      FD2.display();

      cout<<"\n Deposit 3: ";

      FD3.display();

      getch();

}

output 1:

output 2: