SOME VERY SIMPLE AND BASIC JAVA SOURCE CODES THAT I DEVELOPED. FEEL FREE TO POINT OUT ERRORS IF ANY.

SOURCE CODE #1
//A simple program to find the sum of all natural numbers till 100 (0,100)
public class SumTillHundred
{
public static void main(String args[])
{
int i;
int digit;
for (i=1 , digit = 0; i<=100;i++)
{
digit=digit+i;
}
System.out.println("The sum of natural numbers till 100 = " + digit);
}
}

OUTPUT FOR SOURCE CODE #1

The sum of natural numbers till 100 = 5050

SOURCE CODE #2

//A simple program to find the product of all even positive numbers less than ten

public class ProdEvenLessThanTen 

{

public static void main(String args[])

{

int n;

int digit=1;

for(n=2;n<10 n="" p="">

if(n%2==0)

digit=digit*n;

System.out.println("The product of all even numbers less than 10 is " + digit);

}

}

OUTPUT FOR SOURCE CODE #2

The product of all even numbers less than 10 is 384

SOURCE CODE #3

//A Simple java program that reads a line from keyboard and outputs "Hello"+name

import java.io.*;

public class HelloPlusName 

{

public static void main(String args[]) throws java.lang.Exception

{

System.out.println("Enter your name");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String name = br.readLine();

System.out.println("Hello " + name);

}

}

OUTPUT FOR SOURCE CODE #3

Enter your name

Hemapriya

Hello Hemapriya

SOURCE CODE #4

//A simple program that appends firstname with surname and prints the output as "welcome + fullname"

import java.io.*;

import java.lang.String;

public class SurnamePlusFirstname {

public static void main (String args[])throws Exception

{

System.out.println("Enter your firstname \n");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String firstname = br.readLine();

System.out.println("Enter your surname \n");

BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));

String lastname = br2.readLine();

StringBuilder fullname = new StringBuilder();

fullname.append(firstname); 

fullname.append(lastname);

System.out.println("Welcome " + fullname + "!");

}

}

OUTPUT FOR SOURCE CODE #4

Enter your firstname 

Hemapriya

Enter your surname 

Gopal

Welcome HemapriyaGopal!

SOURCE CODE #5

//Program to find the slope of a straight line in XY- axes when the equation is given

//Assumption: THE SIMPLE CASE THAT THE STRAIGHT LINE INTERSECTS BOTH THE AXES

import java.io.*;

public class SlopeOfStraightLine {

public static void main(String args[]) throws Exception 

{

System.out.println("Enter the equation of the straight line in the two dimensional axes");

BufferedReader br = new BufferedReader(new InputStreamReader (System.in));

String eqn = br.readLine();

System.out.println("Enter the co-efficient of x \n");

BufferedReader br1 = new BufferedReader(new InputStreamReader (System.in));

String str1 = br1.readLine();

float coex = Integer.parseInt(str1);

System.out.println("Enter the co-efficient of y \n");

BufferedReader br2 = new BufferedReader(new InputStreamReader (System.in));

String str2 = br2.readLine();

float coey = Integer.parseInt(str2);

float slope = -(coey/coex);

System.out.println("The straight line having the equation " + eqn + " has the slope value of " + slope + "\n");

}

}

OUTPUT FOR SOURCE CODE #5

Enter the equation of the straight line in the two dimensional axes

2X-3Y+6=0

Enter the co-efficient of x 

2

Enter the co-efficient of y 

-3

The straight line having the equation 2X-3Y+6=0 has the slope value of 1.5