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Wednesday, 13 April 2011

Java program to find that the given number is prime or not

import java.util.*;
class prime
{
public static void main (String arg[])
{
Scanner in=new Scanner (System.in);
int a,b=2,c=1;
System.out.print ("\n\t Enter the number = ");
a=in.nextInt();
while (b<=a/2)
{
if (a%b==0)
c=0;
++b;
}
if (c==0)
System.out.println ("\n\t Not a prime number");
else
System.out.println ("\n\t Prime number");
}
}

Java program to calculate sum of even and odd numbers

import java.util.*;
class sum
{
public static void main (String arg[])
{
Scanner in=new Scanner (System.in);
int a,b,c,d,e,s=0;

System.out.print ("\n\t Enter first number = ");
a=in.nextInt();
if (a%2!=0)
s+=a;
else 
System.out.println ("\n\t "+a+" is even number");
System.out.print ("\n\t Enter second number = ");
b=in.nextInt();
if (b%2!=0)
s+=b;
else
System.out.println ("\n\t "+b+" is even number");
System.out.print ("\n\t Enter third number = ");
c=in.nextInt();
if (c%2!=0)
s+=c;
else
System.out.println ("\n\t "+c+" is even number");
System.out.print ("\n\t Enter fourth number = ");
d=in.nextInt();
if (d%2!=0)
s+=d;
else
System.out.println ("\n\t "+d+" is even number");
System.out.print ("\n\t Enter fifth number = ");
e=in.nextInt();
if (e%2!=0)
s+=e;
else
System.out.println ("\n\t "+e+" is even number");

System.out.println ("\n\t Sum of Odd numbers is = "+s);
}
}

Java program to calculate average of two numbers

import java.util.*;
class average
{
public static void main (String arg[])
{
Scanner in=new Scanner (System.in);
int a,b,avg;
System.out.print ("\n\t Enter first number = ");
a=in.nextInt();
System.out.print ("\n\t Enter second number = ");
b=in.nextInt();
a+=b;
avg=(a)/2;
if (avg>50)
System.out.println ("\n\t Error ");
else 
System.out.println ("\n\t Sum = "+a+"    Average = "+avg);
}
}