Looping Structures

Q1.Write a program to display the following format using while loop:
      -------------
      a           b
      -------------
      1           5
      2           4
      3           3
      4           2
      5           1
     -------------

#include<iostream.h>
#include<conio.h>
void main()

{
 clrscr();

   int a=1,b=5;
   cout<<"----------\n";
   cout<<("a\tb\n");
   cout<<"----------\n";
   while(a<=5)
  {
  
    cout<<a<<"\t"<<b<<endl;
   a++;
   b--;
}
 cout<<"----------\n";

getch();

}


Q2. Write a program to display the following  format using while loop:
      ----------------
      num         sum
      ----------------
      1           1
      2           3
      3           6
      4           10
      5           15
      --------------


#include<iostream.h>
#include<conio.h>
void main()

{
 clrscr();

   int num=1,sum=0;
   cout<<"----------\n";
   cout<<("num\tsum\n");
   cout<<"----------\n";
   while(num<=5)
  {
  
    sum=sum+num;
  cout<<num<<"\t"<<sum<<"\n";
   num++;
}
 cout<<"----------\n";

getch();

}

Q3. Write a program that displays the sum of the following series using do-while loop.
1+1/4+1/8+......+1/100

#include<iostream.h>
#include<conio.h>
void main()

{
  clrscr();

   float c,r;
   c=4.0;
   r=1.0;
   do
{
    r=r+1.0/c;
    c=c+4;
}
   while(c<=100);
   cout<<"Result is "<<r;

getch();

}


Q4.Write a program to display alphabets from A to Z using for loop...

#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();

     char ch;
     for(ch='A';ch<='Z';ch++)
      cout<<ch;

getch();

}