Question

Write a program to display the pattern: 

1. A B C D E
   B C D E
   C D E
   D E
   E
2. A 
   B C
   D E F
   G H I J
   K L M N O
3. A B C D E
   A B C D A 
   A B C A B 
   A B A B C
   A A B C D

Answer 1

// Except Pattern2, All other patterns can be reused
//to accommodate other strings by changing the value of the String variable
class SQ21{
public static void main(String hg[])
{int i, j, len;
String s = "ABCDE";
s = s.trim(); // remove leading and trailing spaces
len = s.length();

System.out.println("\n***Pattern1***");
for (i = 0; i < len; i++) [rows
{ for (j = i; j < len; j++) // columns
System.out.print(" " + s.charAt(j));
System.out.println();
}

System.out.println("\n***Pattern2***");
int p = 65; // capital A
for (i = 0; i < 5; i++) // rows
{ for (j = 0; j <= i; j++) // columns
{System.out.print(" " + (char)p);
p++; // increment the ascii value
}
System.out.println();
}

System.out.println("\n***Pattern3***"); // before diagonal
for (i = len; i > 0; i--)
{ for (j = 0; j < i; j++)
System.out.print(" " + s.charAt(j));

for (int m = 0; m < len-i; m++) // after diagonal
System.out.print(" " + s.charAt(m));
System.out.println();
}}}