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Vertical Banner Program - Java Program

The names of the teams participating in a competition should be displayed on a banner vertically, to accommodate as many teams as possible in a single banner.

Design a program to accept the names of N teams, where 2 < N < 9 and display them in vertical order, side by side with a horizontal tab (i.e. eight spaces).

Test your program for the following data and some random data:

Example 1:
INPUT:
N = 3
Team 1: Emus
Team 2: Road Rols
Team 3: Coyote
OUTPUT:

E        R        C
m        o        o
u        a         y
s        d         o
                    t
         R         e
         o
         l
         s

Example 2:
INPUT:
N = 4
Team 1: Royal
Team 2: Mars
Team 3: De Rose
Team 4: Kings
OUTPUT:

R        M        D        K
o        a        e          i
y        r                   n
a        s        R         g
l                 o           s
                  s
                  e

Example 3:
INPUT:
N = 10
OUTPUT:
Invalid input.

Program:

Java 
import java.io.*;
class Banner{
    public static void main(String args[])
    throws IOException{
        InputStreamReader in = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(in);
        int n = 0;
        String a[];
        int i = 0;
        int len = 0;
        int j = 0;

        System.out.print("N = ");
        n = Integer.parseInt(br.readLine());
        if(n <= 2 || n >= 9){
            System.out.println("Invalid input.");
            return;
        }
        a = new String[n];
        for(i = 0; i < n; i++){
            System.out.print("Team " + (i + 1) + ": ");
            a[i] = br.readLine();
            if(len < a[i].length())
                len = a[i].length();
        }

        for(i = 0; i < len; i++){
            for(j = 0; j < n; j++){
                if(i < a[j].length())
                    System.out.print(a[j].charAt(i) + "\t");
                else
                    System.out.print("\t");
            }
            System.out.println();
        }
    }
}

Output

OUTPUT 1:
 
N = 3
Team 1: Emus
Team 2: Road Rols
Team 3: Coyote
E   R   C   
m   o   o   
u   a   y   
s   d   o   
        t   
    R   e   
    o       
    l       
    s   

OUTPUT 2:    

N = 4
Team 1: Royal
Team 2: Mars
Team 3: De Rose
Team 4: Kings
R   M   D   K   
o   a   e   i   
y   r       n   
a   s   R   g   
l       o   s   
        s       
        e
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