Quadratic Equation

Wap to input the values of three coefficients of a quadratic equation
AX(Square)+BX+C=0
Find the roots of the Equation and display them , stating wether they are real,imaginary or equal
Also print the value of X

import java.io.*;
class Quadratic
{
public int a,b,c;
public void Quadratic()throws IOException
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println(" Enter the value A");
int a = Integer.parseInt(br.readLine());
System.out.println(" Enter the value B ");
int b = Integer.parseInt(br.readLine());
System.out.println(" Enter the value C ");
int c = Integer.parseInt(br.readLine());
}
public void Values()
{
double x1,x2;
int z = (b*b)-(4*a*c);
if(z>0)
{
System.out.println(" Real Roots ");
x1=(-b+Math.sqrt(b*b-4*a*c))/(2*a);
System.out.println( " Root 1 " + x1);
x2=(-b-Math.sqrt(b*b-4*a*c))/(2*a);
System.out.println( " Root 2 " + x2);
}
else if(z==0)
{
System.out.println(" Equal Roots ");
x1= (b)/(2*a);
System.out.println(" Root = " +x1);
}
else if(z<0)
{
System.out.println(" Imaginary Roots ");
}
}
public static void main(String args[])throws IOException
{
Quadratic Q = new Quadratic();
Q.Quadratic();
Q.Values();
}
}

String based Program

Write a Program to accept a String and print it in following manner
Input - Harsh Kumar Agrawal ( Just an Example)
Output - H.K.Agrawal

Frequency Of Vowels In the String

Q Write a Program to Find the Number of times vowels Occure in a given String

Method 1 - Of anshul
import java.io.*;
class vowels{ public static void main()throws IOException
{
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
String str;
int i,c=0,j;
System.out.println("Enter a string");
str=in.readLine();
str=str.toLowerCase();
for(i=0;i<=str.length()-1;i++)
{
j=str.charAt(i);
if(j==' ')
{
if((j+1)=='a'(j+1)=='e'(j+1)=='i'(j+1)=='o'(j+1)=='u')
c++;
}
}
if(str.charAt(0)=='a'str.charAt(0)=='e'str.charAt(0)=='i'str.charAt(0)=='o'str.charAt(0)=='u')
c++;
System.out.println("\n no. of words starting with vowels::::"+c);
}
}

Method 2 (By Harsh)(me :))
import java.io.*;
class Proverbial
{
public static void main(String args[])throws IOException
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println(" Enter a String ");
String s=br.readLine();
char ch;
s=s.toLowerCase();
int c=0,l=s.length();
for(int i=0;i
{
ch=s.charAt(i);
if(ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u')
c++;
}
System.out.println(" Frequency of Vowels is "+ c);
}
}

Perfect Number

A perfect Integer is a number which is equal to the sum of all its factors
eg - 28 is a perfect integer as it is the sum of all its factor -
1 + 2 + 4 + 7 + 14 = 28
Wap to display perfeect integers form 1 to 1000
Evergreen Publications Model Paper1 Q9

[2D array]Sum of Even and Odd

WAP a program to find the product of all the even elements and all the odd elements present in the array

//Wap to Store 12 elements in a array of size 3X4 and find the sum of all the elements
//and product of even elements and odd elements.

import java.io.*;
class EvenOdd
{
public static void main(String args[])throws IOException
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int a[][]=new int[3][4];
int s=0,even=1,odd=1;
System.out.println(" Enter 12 elements for array one :");
for(int i=0;i<3;i++)
{
for(int j=0;j<4;j++)
{
a[i][j]=Integer.parseInt(br.readLine());
s=s+a[i][j];
if(a[i][j]%2==0)
even=even*a[i][j];
else
odd=odd*a[i][j];
}
}
System.out.println(" Sum = " +s);
System.out.println(" Product of Even = " + even );
System.out.println(" Product of odd = " + odd);
}
}