标签：Java Scanner 梁勇 double System input 例题 public out
程序清单2-1：ComputeArea.java
public class ComputeArea {
public static void main(String[] args) {
// TODO Auto-generated method stub
double radius;
double area;
radius = 20;
area = radius * radius * 3.14159;
System.out.println("The area for the circle of radius " + radius + " is " + area);
}
}
程序清单2-2:ComputeAreaWithConsoleInput.java
import java.util.Scanner;
public class ComputeAreaWithConsoleInput {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter a number for radius: ");
double radius = input.nextDouble();
double area = radius * radius * 3.14159;
System.out.println("The area for the circle of radius " + radius + " is " + area);
input.close();
}
}
程序清单2-3:ComputeAverage.java
import java.util.Scanner;
public class ComputeAverage {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter a number for radius: ");
double number1 = input.nextDouble();
double number2 = input.nextDouble();
double number3 = input.nextDouble();
double average = (number1 + number2 + number3) / 3;
System.out.println("The average of " + number1 + " " + number2 + " " + number3 + " is " + average);
input.close();
}
}
程序清单2-4:ComputeAreaWithConstant.java
import java.util.Scanner;
public class ComputeAreaWithConstant {
public static void main(String[] args) {
// TODO Auto-generated method stub
final double PI = 3.14159;
Scanner input = new Scanner(System.in);
System.out.print("Enter a number for radius: ");
double radius = input.nextDouble();
double area = radius * radius * PI;
System.out.println("The area for the circle of radius " + radius + " is " + area);
input.close();
}
}
程序清单2-5:DisplayTime.java
import java.util.Scanner;
public class DisplayTime {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter an integer for seconds: ");
int seconds = input.nextInt();
int minutes = seconds / 60;
int remainingSeconds = seconds % 60;
System.out.println(seconds + " seconds is " + minutes + " minutes and " + remainingSeconds + " seconds");
input.close();
}
}
程序清单2-6:FahrenheitToCelsius.java
import java.util.Scanner;
public class FahrenheitToCelsius {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter a degree in Fahrenheit: ");
double fahrenheit = input.nextDouble();
double celsius = (5.0 / 9) * (fahrenheit - 32);
System.out.println("Fahrenheit " + fahrenheit + " is " + celsius +" in Celeius");
input.close();
}
}
程序清单2-7:ShowCurrentTime.java
public class ShowCurrentTime {
public static void main(String[] args) {
// TODO Auto-generated method stub
long totalMilliseconds = System.currentTimeMillis();
long totalSeconds = totalMilliseconds / 1000;
long currentSecond = totalSeconds % 60;
long totalMinutes = totalSeconds / 60;
long currentMinute = totalMinutes % 60;
long totalHours = totalMinutes / 60;
long currentHour = totalHours % 24;
System.out.println("Current time is " + currentHour + ":" + currentMinute + ":" + currentSecond + " GMT");
}
}
程序清单2-8:SalesTax.java
import java.util.Scanner;
public class SalesTax {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter purchase amount: ");
double purchaseAmount = input.nextDouble();
double tax = purchaseAmount * 0.06;
System.out.println("Sales tax is $" + (int)(tax * 100) / 100.0);
input.close();
}
}
程序清单2-9:ComputeLoan.java
import java.util.Scanner;
public class ComputeLoan {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter annual interest rate, e.g., 7.25: ");
double annualInterestRate = input.nextDouble();
double monthlyInterestRate = annualInterestRate / 1200;
System.out.print("Enter number of years as an integer, e.g.,5: ");
int numberOfYears = input.nextInt();
System.out.print("Enter loan amount, e.g.,120000.95: ");
double loanAmount = input.nextDouble();
double monthlyPayment = loanAmount * monthlyInterestRate / (1 - 1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12));
double totalPayment = monthlyPayment * numberOfYears * 12;
System.out.println("The monthly payment is $" + (int)(monthlyPayment * 100) / 100.0);
System.out.println("The total payment is $" + (int)(totalPayment * 100) / 100.0);
input.close();
}
}
程序清单2-10: ComputeChange.java
import java.util.Scanner;
public class ComputeChange {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter an amount in double, for example 11.56: ");
double amount = input.nextDouble();
int remainingAmount = (int)(amount * 100);
int numberOfOneDollars = remainingAmount / 100;
remainingAmount = remainingAmount % 100;
int numberOfQuarters = remainingAmount / 25;
remainingAmount = remainingAmount % 25;
int numberOfDimes = remainingAmount / 10;
remainingAmount =remainingAmount % 10;
int numberOfNickels = remainingAmount / 5;
remainingAmount =remainingAmount % 5;
int numberOfPennies = remainingAmount;
System.out.println("Your amount " + amount + "consists of");
System.out.println(" " + numberOfOneDollars + " dollars");
System.out.println(" " + numberOfQuarters + " quarters");
System.out.println(" " + numberOfDimes + " dimes");
System.out.println(" " + numberOfNickels + " nickels");
System.out.println(" " + numberOfPennies + " pennies");
input.close();
}
}
标签：Java,Scanner,梁勇,double,System,input,例题,public,out 来源： https://blog.csdn.net/m0_64039166/article/details/123618810
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