11-D 21. Write a algorithm and program using nested loops to produce the following designs: Using functions and with switch concept in the main program

21.   Write a program using nested loops to produce the following designs: Using functions

A) * ** *** **** *****

B) 1 12 123 1234 12345

C) 1 23 456 78910

 #include<iostream.h>

 #include<conio.h>

 void dis21A(int x)

 {

  int i,j;

  i=1;

  while(i<=x)

  {

  for(j=1;j<=i;j++)

  {

  cout<<"*";

  }

  cout<<"\n";

  i++;

  }

  }

 void dis21B(int x)

 {

  int i,j;

  i=1;

  while(i<=x)

  {

  for(j=1;j<=i;j++)

  {

  cout<<j;

  }

  cout<<"\n";

  i++;

  }

  }

 void dis21C(int x)

 {

  int i,j,k;

  i=1,k=1;

  while(i<=x)

  {

  for(j=1;j<=i;j++)

  {

  cout<<k<<"\t";

  k++;

  }

  cout<<"\n";

  i++;

  }

 }

  void main()

  {

  int x,ch ;

  clrscr();

  cout<<"enter x \n";

  cin>>x;

  cout<<"enter choice\n";

  cin>>ch;

  switch(ch)

  {

  case 1:{

  dis21A(x);

  break;

  }

  case 2:{

dis21B(x);

break;

}

   case 3:{

dis21C(x);

break;

}

  default:{

   cout<<"wrong choice\n";

   break;

  }

  }

  getch();

  }