JAVA Programs

Q. WAP to find area of Circle.

import java.io.*;
import java.lang.*;
class CircleDemo
{
public static void main(String arg[])
{
double r,ar;
DataInputStream br=new DataInputStream(System.in);
try
{
System.out.print("Enter radius : ");
r=Integer.parseInt(br.readLine());
ar=3.14*r*r;
System.out.println("Area of Circle : "+ar);
}
catch(Exception ex)
{}
}
}

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Q.WAP to find roots of Quadratic equations.


import java.io.*;
import java.lang.*;
class Quad
{
public static void main(String arg[])
{
double x,b,a,c,y,d;
DataInputStream br=new DataInputStream(System.in);
try
{
System.out.print("Enter b :");
b=Double.parseDouble(br.readLine());
System.out.print("Enter a :");
a=Double.parseDouble(br.readLine());
System.out.print("Enter c :");
c=Double.parseDouble(br.readLine());
d=(b*b-4*a*c);
if(d==0)
{
System.out.println("Determinant is Zero");
x=-(b+(Math.sqrt(d)));
System.out.println("Only 1 real root possible : "+x);
}
else if(d<0)
{
System.out.println("Determinant is negative");
System.out.println("No real root Possible");
}
else if(d>0)
{
System.out.println("Determinant is Positive");
x=-(b+(Math.sqrt(d)));
y=-(b-(Math.sqrt(d)));
System.out.println("Two real root are possible : "+x+" and "+y);

}
}
catch(Exception ex)
{}
}
}

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Q.WAP to find area of non-equilateral triangle.


import java.io.*;
import java.lang.*;
class TriangleDemo
{
public static void main(String arg[])
{
int s,a,b,c;
double t;
DataInputStream br=new DataInputStream(System.in);
try
{
System.out.println("Enter 3 sides of triangle : ");
a=Integer.parseInt(br.readLine());
b=Integer.parseInt(br.readLine());
c=Integer.parseInt(br.readLine());
s=(a+b+c)/2;
t=Math.sqrt((s*(s-a)*(s-b)*(s-c)));
System.out.println("Area="+t);
}
catch(Exception ex)
{}
}
}

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Q.WAP to calculate Simple Interest.

import java.io.*;

import java.lang.*;

class SiDemo

{

public static void main(String arg[])

{

double p,r,t,si;

DataInputStream br=new DataInputStream(System.in);

try

{

System.out.print("Enter Principle: ");

p=Double.parseDouble(br.readLine());

System.out.print("Enter Rate: ");

r=Integer.parseInt(br.readLine());

System.out.print("Enter Time: ");

t=Integer.parseInt(br.readLine());

si=(p*r*t)/100;

System.out.println("Simple Interest : "+si);

}

catch(Exception ex)

{}

}

}