Example1

import java.util.Scanner;

/*Assign letter grade

*

*Author: Turgay

*

*Date: September 2007

*

*/

public class Grade

{

public static void main(String[] args)

{

Scanner keyboard = new Scanner (System.in);

//VARIABLES

int grade;

//CODE

System.out.print ("Please enter your numeric grade: ");

grade = keyboard.nextInt();

System.out.println("Numeric grade is " + grade);

if(grade<0 || grade>100)

System.out.println("Error");

if(grade>=0 && grade<60)

System.out.println("Letter Grade is F");

if(grade>=60 && grade<70)

System.out.println("Letter Grade is D");

if(grade>=70 && grade<80)

System.out.println("Letter Grade is C");

if(grade>=80 && grade<90)

System.out.println("Letter Grade is B");

if(grade>=90 && grade<=100)

System.out.println("Letter Grade is A");

}

}

Example2

import java.util.Scanner;

/*Assign letter grade

*

*Author: Turgay

*

*Date: September 2007

*

*/

public class GradeNested

{

public static void main(String[] args)

{

Scanner keyboard = new Scanner (System.in);

//CONSTANTS

final String message = "Your letter grade is ";

//VARIABLES

int grade;

//PROGRAM CODE

System.out.print ("Please enter your numeric grade: ");

grade = keyboard.nextInt();

System.out.println("Numeric grade is " + grade);

if(grade<0 || grade>100)

System.out.println("Enter a number between 0-100");

else if (grade>=90)

System.out.println (message + 'A');

else if(grade>=80)

System.out.println (message + 'B');

else if (grade>=70)

System.out.println (message + 'C');

else if (grade>=60)

System.out.println (message + 'D');

else

System.out.println (message + 'F');

}

}

Example3

import java.util.Scanner;

/*Calculate Body Mass Index and report

*

*Author: Turgay

*

*Date: September 2007

*

*/

public class BMI

{

public static void main(String[] args)

{

Scanner keyboard = new Scanner (System.in);

//CONSTANTS

final String STARLINE = "\n**********************************";

//VARIABLES

int weight, height;

double bmi, heightf;

//CODE

System.out.print ("Please enter your weight in kg.s: ");

weight = keyboard.nextInt();

System.out.print ("Please enter your height in centimeters: ");

height = keyboard.nextInt();

heightf = height / 100.0;

bmi = weight / (heightf * heightf);

System.out.println(STARLINE);

System.out.print ("Your BMI is: ");

System.out.printf ("%6.2f",bmi);

System.out.println(STARLINE);

if(bmi < 18.5 )

System.out.println("You are too skinny");

if(bmi >= 18.5 && bmi < 25)

System.out.println("You are perfectly normal");

if(bmi >= 25 && bmi<30)

System.out.println("You are a bit overweight");

if(bmi >= 30)

System.out.println("Better see your doctor");

}

}

Example4

import java.util.Scanner;

/*Calculate Body Mass Index and report

*

*Author: Turgay

*

*Date: September 2007

*

*/

public class BMI2

{

public static void main(String[] args)

{

Scanner keyboard = new Scanner (System.in);

//CONSTANTS

final String STARLINE = "\n**********************************";

//VARIABLES

double weight, height, height_in_meters, height_square, BMIvalue, new_weight ;

boolean obese, fat, normal, weak ;

//PROGRAM CODE

System.out.print ("Please enter your weight in kg.s: ");

weight = keyboard.nextDouble();

System.out.print ("Please enter your height in centimeters: ");

height = keyboard.nextInt();

height_in_meters = height / 100 ;

height_square = Math.pow (height_in_meters,2) ;

BMIvalue = weight / height_square ;

obese = BMIvalue >= 30 ;

fat = BMIvalue >= 25 && BMIvalue < 30 ;

normal = BMIvalue < 25 && BMIvalue >= 18.5 ;

weak = BMIvalue < 18.5 ;

new_weight = 24.99 * height_square ;

System.out.println();

System.out.print("Your BMI is ");

System.out.print(BMIvalue);

System.out.print(". ");

System.out.println();

if (obese) {

System.out.print("You are an obese. ") ;

System.out.print("You should give up ");

System.out.print(weight - new_weight);

System.out.println(" kilos!");

}

else if (fat) {

System.out.print("You are overweight. ") ;

System.out.print("You should give up ");

System.out.print(weight - new_weight);

System.out.println(" kilos!");

}

else if (normal)

System.out.println ("Your weight is normal. ") ;

else if (weak)

System.out.println ("You are underweight.") ;

}

}