Dustin_m
Member
I've started taking both a Java and a C++ class this semester. I'm done with all required classes, so while waiting to get into a school to transfer, I'm taking a couple classes for fun. I thought I'd post up some of the small assignments I've done so far to see if it all looks ok. Yes, this is beginner stuff, but I remember always seeing you guys on here bitching about people developing bad habits from the get go, so I thought I'd put my stuff out here and let you pick it apart. Let me know where I'm doing something wrong or in a way that's inefficient.
This first one is the only C++ assignment so far, and it's short.
and here's the Java ones.
This first one is the only C++ assignment so far, and it's short.
Code:
asst1.cpp - This program calculates the area and
circumference of a circle
Dustin Michelson
Sep 7, 2009
****************************************************************/
#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int main()
{
double radius ; //Declares radius variable
cout << "Please enter the radius of a circle\n" ; //Prompts user for data
cin >> radius ; //Gives value to radius
cout << "\nThe area of the circle is:\t\t" << (M_PI * (radius * radius)) << endl ; //Prints radius to screen
cout << "\nThe circumference of the circle is:\t" << (2 * M_PI * radius) << endl ; //Prints circumference to screen
return 0 ;
}
Code:
/*coinsToDollars.java
*
*This program will give the total dollar value of the amount of coins entered by the user
*
*Michelson, Dustin
*/
import java.util.Scanner;
import java.text.DecimalFormat;
public class coinsToDollars
{
public static void main( String [] args )
{
Scanner scan = new Scanner( System.in ); //instantiates a Scanner object named scan
DecimalFormat pricePattern = new DecimalFormat( "$#0.00"); //instantiates a DecimalFormat object named pricePattern
double quarterValue, dimeValue, nickelValue; //initializes a variable to hold the total value of each type of coin
double sum; //This will hold the total dollar amount of the coins
System.out.print( "Enter the number of quarters: " ); //Prompts user for number of quarters
int quarters = scan.nextInt( ) ; //Puts user input into quarters variable
System.out.print( "Enter the number of dimes: " ); //Prompts user for number of dimes
int dimes = scan.nextInt( ) ; //Puts user input into dimes variable
System.out.print( "Enter the number of nickels: " ); //Prompts user for number of nickels
int nickels = scan.nextInt( ); //Puts user input into nickels variable
quarterValue = quarters * 0.25; //Changes the number of quarters into a dollar value
dimeValue = dimes * 0.10; //Changes the number of dimes into a dollar value
nickelValue = nickels * 0.05; //Changes the number of nickels into a dollar value
sum = quarterValue + dimeValue + nickelValue; //Calculates the sum of the coins
System.out.println( "The total value of the coins is "
+ pricePattern.format( sum )); //Prints the total dollar value to the screen
}
}
Code:
/**
* @(#)domainName.java
*
*This program will let the user input a name,
*then it will turn that name into a domain name by adding
*a www. to the beginning and a .com to the end
*
*
* @author Dustin Michelson
* @version 1.00 2009/9/14
*/
import java.util.Scanner;
public class domainName
{
public static void main( String [] args )
{
Scanner scan = new Scanner( System.in );
System.out.print( "Enter a word that you would like to turn into a domain name: " );
String domainWord = scan.next( );
System.out.println( "Your domain name is: www." + domainWord + ".com" );
}
}
Code:
/**
* @(#)smallerOfTwoRandomNumbers.java
*
*This program will randomly generate two numbers between 0 and 100,
*and will print the smaller of the two
*
*
* @author Dustin Michelson
* @version 1.00 2009/9/14
*/
import java.util.Scanner;
import java.util.Random;
public class smallerOfTwoRandomNumbers
{
public static void main( String [] args )
{
Scanner scan = new Scanner( System.in ); //instantiates a new Scanner object
Random random = new Random( ); //instantiates a new Random object
int number1 = random.nextInt( 100 - 0 + 1) + 0; //genereates a random number between 0 and 100
System.out.println( "The first random number is " + number1 ); //Prints the first random number
int number2 = random.nextInt( 100 - 0 + 1) + 0; //generates another random number
System.out.println( "The second random number is " + number2); //prints the second random number
if (number1 < number2) { //Determines which word is longer and prints the longer of the two words
System.out.println ( "The smaller of the two numbers is " + number1 ) ;
} else {
System.out.println ( "The smaller of the two numbers is " + number2 ) ;
}
}
}
Code:
/**
* @(#)longerOfTwoWords.java
*
*This program will let the user input two words. It will then determine
*which of the two words is smaller, and output that word
*
*
* @author Dustin Michelson
* @version 1.00 2009/9/14
*/
import java.util.Scanner;
public class longerOfTwoWords
{
public static void main( String [] args )
{
Scanner scan = new Scanner( System.in) ;
System.out.print( "Enter your first word: " ) ; //Prompts user for first word
String firstWord = scan.next( ) ; //Puts user input into firstWord
System.out.print( "Enter your second word: " ) ; //Prompts user for second word
String secondWord = scan.next( ) ; //Puts user input into secondWord
int firstWordLength = firstWord.length( ) ; //Sends the length of firstWord to firstWordLength as an integer value
int secondWordLength = secondWord.length( ) ; //Sends the length of secondWord to secondWordLength as an integer value
if (firstWordLength > secondWordLength) { //Determines which word is longer and prints the longer of the two words
System.out.println ( "The longer of the two words is " + firstWord ) ;
} else {
System.out.println ( "The longer of the two words is " + secondWord ) ;
}
}
}
Code:
/**
* @(#)futureValueOfInvestment.java
*
*This program will let the user input an initial investment amount and
*an interest rate, and will calculate the value of the investment in 5, 10, and 20 years
*
*
* @author Dustin Michelson
* @version 1.00 2009/9/14
*/
import java.util.Scanner;
import java.text.DecimalFormat;
public class futureValueOfInvestment
{
public static void main( String [] args )
{
Scanner scan = new Scanner( System.in ); //instantiates a new Scanner object
DecimalFormat pricePattern = new DecimalFormat( "$#0.00"); //instantiates a DecimalFormat object
System.out.print( "Please enter a value for the initial investment in whole dollars: " );
double initialInvestment = scan.nextDouble( );
System.out.print( "Please enter a value for the interest rate in decimal format: " );
double interestRate = scan.nextDouble( );
double value5yrs = Math.pow((1 + interestRate), 5) * initialInvestment;
double value10yrs = Math.pow((1 + interestRate), 10) * initialInvestment;
double value20yrs = Math.pow((1 + interestRate), 20) * initialInvestment;
System.out.println( "The value of the investment in 5 years will be "
+ pricePattern.format( value5yrs ));
System.out.println( "The value of the investment in 10 years will be "
+ pricePattern.format( value10yrs ));
System.out.println( "The value of the investment in 20 years will be "
+ pricePattern.format( value20yrs ));
}
}
Code:
/* This program will calculate and print the area and
* circumference of a circle with radius 3.2 inches
*
* Michelson, Dustin
*/
public class areaAndCircumferenceOfCircle
{
public static void main( String [] args )
{
final double PI = 3.14159;
double radius = 3.2;
double circumference = (2 * PI * radius); //Equation for the circumference of a circle in terms of the radius
double area = (PI * (radius * radius)); //Equation for the area of a circle in terms of the radius
System.out.println("For a circle with a radius of 3.2 inches:");
System.out.println("\tThe area of the circle in inches is " + area); //Prints the area
System.out.println("\tThe circumference of the circle in inches is " + circumference); //Prints the circumference
}
}
Code:
/* This program will convert 2, 5, and 10 inches to millimeters
*
* Michelson, Dustin
*/
public class inchesToMillimetersConverter
{
public static void main( String [] args )
{
final double CONVERSION_FACTOR = 25.4; //There are 25.4mm in 1 inch
double lengthInMillimeters;
int lengthInInches = 2; //Sets the length in inches to 2 to calculate the length in millimeters
System.out.println("The number of millimeters in 2 inches is " + (lengthInInches * CONVERSION_FACTOR));
lengthInInches = 5; //Sets the length in inches to 5 to calculate the length in millimeters
System.out.println("The number of millimeters in 5 inches is " + (lengthInInches * CONVERSION_FACTOR));
lengthInInches = 10; //Sets the length in inches to 10 to calculate the length in millimeters
System.out.println("The number of millimeters in 10 inches is " + (lengthInInches * CONVERSION_FACTOR));
}
}
Code:
/* This program will convert 10, 50, and 100 pounds into their equivalent amounts in kilograms
*
* Michelson, Dustin
*/
public class poundsToKilogramsConverter
{
public static void main( String [] args )
{
final double CONVERSION_FACTOR = 4.54E-1; //There are 0.454 kilograms in each pound
double weightInKilograms;
int weightInPounds = 10; //Sets the weight in kg to 10 to convert to pounds
System.out.println("The number of kilograms in 10 pounds is " + (weightInPounds * CONVERSION_FACTOR));
weightInPounds = 50; //Sets the weight in kg to 50 to convert to pounds
System.out.println("The number of kilograms in 50 pounds is " + (weightInPounds * CONVERSION_FACTOR));
weightInPounds = 100; //Sets the weight in kg to 100 to convert to pounds
System.out.println("The number of kilograms in 100 pounds is " + (weightInPounds * CONVERSION_FACTOR));
}
}