exam平台Java试题阶段（一）

说明：

以下为过程化考试平台Java练习题，代码是自己写的，由于我的水平很有限，不免有不妥之处，欢迎指正赐教，谢谢！

1.en_ 2017_ p1_001 Convert Celsius to Fahrenheit

Write a program that reads a Celsius degree in a double value from the console, then converts it to Fahrenheit and displays the
result. The formula for the conversion is as follows:
fahrenheit = (9 / 5) * celsius + 32

Note: The class Name must be Main

Example：

Enter a degree in Celsius:

output:

40.0 Celsius is 104.0 Frhrenheit

 /******start******/import java.util.Scanner;public class Main {public static void main(String[]args){System.out.println("Enter a degree in Celsius:");Scanner sc = new Scanner(System.in);double cel= sc.nextDouble();double frh= (9.0/5)*cel+32;//In java,9/5 is 1,but 9.0/5 is 1.8.System.out.println("output:");System.out.println(cel+" Celsius is "+frh+" Frhrenheit");}}/******end******/

2.en_ 2017_ p1_002 Compute the volume of a cylinder

Write a program that reads in the radius and length of a cylinder and computes the area(面积) and volume（体积） using the following formulas:

area = radius * radius * π

volume = area * length

use Math.PI as π

Example:

Enter the radius and length of a cylinder:

5.5 12

The area is 95.03317777109125

The volume is 1140.398133253095

    import java.util.Scanner;public class Main {/******start******/public static void main(String[] args){System.out.println("Enter the radius and length of a cylinder:");Scanner sc = new Scanner(System.in);double radius=sc.nextDouble();double length=sc.nextDouble();double area,volume;area = radius * radius *Math.PI;volume = area * length;System.out.println("The area is "+area);System.out.println("The volume is "+volume);}/******end******/}

3.en_ 2017_ p1_003 Convert feet into meters

Write a program that reads a number in feet, converts it to meters, and displays the result. One foot is 0.305 meter.

class Name must be Main

Examples：

Enter a value for feet:

16.5

16.5 feet is 5.0325 meters

    /******start******/import java.util.Scanner;public class Main {public static void main(String[] args){System.out.println("Enter a value for feet:");Scanner sc = new Scanner(System.in);double feet = sc.nextDouble();double meter=feet*0.305;System.out.println(feet+" feet is "+meter+" meters");}}/******end******/

4.en_ 2017_ p1_004 Convert pounds into Kilograms

Write a program that converts pounds into kilograms. The program prompts the user to enter a number in

pounds, converts it to kilograms, and displays the result. One pound is 0.454 kilograms.

Examples：

Enter a number in pounds:

55.5

55.5 pounds is 25.197 kilograms

    /******start******/import java.util.Scanner;public class Main {public static void main(String[] args){System.out.println("Enter a number in pounds:");Scanner sc = new Scanner(System.in);double pound = sc.nextDouble();double kilo=pound * 0.454;System.out.println(pound+" pounds is "+kilo+" kilograms");}}/******end******/

5.en_ 2017_ p1_005 Financial application:calculate tips

Write a program that reads the subtotal and the gratuity rate, then computes the gratuity and total. For example, if the user enters 10 for subtotal and 15% for gratuity rate, the program displays $1.5 as gratuity and $11.5 as total

class name Must be Main

Example：

Enter the subtotal and a gratuity rate:

10 16

The gratuity is $1.6 and total is $11.6

    /******start******/import java.util.Scanner;public class Main {public static void main(String[] args){System.out.println("Enter the subtotal and a gratuity rate:");Scanner sc = new Scanner(System.in);float a = sc.nextFloat();float b = sc.nextFloat();float sum1=a*(b/100);String result = String.format("%.1f",sum1);float sum2=a+sum1;System.out.println("The gratuity is $"+result+" and total is $"+sum2);}}/******end******/

6.en_ 2017_ p1_006 Sum the digits in an integer

Write a program that reads an positive integer and adds all the digits in the integer. For example, if an integer is 932, the sum of all its digits is 14. Hint: Use the % operator to extract digits, and use the / operator to remove the extracted digit. For instance, 932 % 10 = 2 and 932 / 10 = 93.

class name Must be Main

Example：

Enter a positive number:

98732

The sum of the digits is 29

    /******start******/import java.util.*;public class Main {public  static void main(String[]args){int sum=0;System.out.println("Enter a positive number:");Scanner sc = new Scanner(System.in);int x = sc.nextInt();while(x>0){sum = sum + x%10;x=x/10;}System.out.print("The sum of the digits is "+sum);}}/******end******/

7.en_ 2017_ p1_007 Find the number of years

Write a program that prompts the user to enter the minutes (e.g., 1 billion), and displays the number of years and days for the minutes. For simplicity, assume a year has 365 days.

Examples：

Enter the number of minutes:

10000000000

10000000000 minutes is approximately 19025 years and 319 days

    /******start******/import java.util.*;public class Main {public static void main(String[]args){long year,day;System.out.println("Enter the number of minutes:");Scanner sc = new Scanner(System.in);long  min = sc.nextLong();year=min/60/24/365;day=min/60/24-year*365;System.out.println(min+" minutes is approximately "+year+" years and "+day+" days");}}/******end******/

8.en_ 2017_ p1_008 Solve 2*2 linear equations

You can use Cramer’s rule to solve the following system of linear equation:

Write a program that prompts the user to enter a, b, c, d, e, and f and displays the result. If is ad - bc 0, report that “The equation has no solution”

example：

Enter a,b,c,d,e,f:

9.0 4.0 3.0 -5.0 -6.0 -21.0

x is -2.0 and y is 3.0

Enter a,b,c,d,e,f:

1.0 2.0 2.0 4.0 4.0 5.0

equation has no solution

    import java.util.Scanner;public class Main {/******start******/public static void main(String[]args){float x=0.0f,y=0.0f;System.out.println("Enter a,b,c,d,e,f:");Scanner sc = new Scanner(System.in);float a =sc.nextFloat();float b =sc.nextFloat();float c =sc.nextFloat();float d =sc.nextFloat();float e =sc.nextFloat();float f =sc.nextFloat();if(a*d-b*c==0){System.out.println("equation has no solution");}else{x=(e*d-b*f)/(a*d-b*c);y=(a*f-e*c)/(a*d-b*c);System.out.println("x is "+x+" and y is "+y);}}/******end******/}

9.en_ 2017_ p1_009 Check a number

此题代码能在eclipse运行，在exam编译结果只有70分，请大神赐教！
Write a program that prompts the user to enter an integer and checks whether the number is divisible by both 5 and 6, or neither of them, or just one of them. Here are some sample runs for inputs 34, 60, and 25.

Example:

Enter an integer:

34 is not divisible by either 5 or 6

Enter an integer:

60 is divisible by both 5 and 6

Enter an integer:

25 is divisible by 5 or 6, but not both

  /******start******/import java.util.*;public class Main{public static void main (String[] args){System.out.println("Enter an integer:");Scanner sc = new Scanner(System.in);int a = sc.nextInt();int mod1,mod2;mod1=a%5;mod2=a%6;if(mod1==0&&mod2==0){System.out.println(a+" is divisible by both 5 and 6");}else if(mod1!=0&&mod2!=0){System.out.println(a+" is not divisible by either 5 or 6");}else{System.out.println(a+" is divisible by 5 or 6, but not both");}}}/******end******/

10.en_ 2017_ p1_010 compute the sum

Write a program to sum the following series:

Example:

Enter a end number as variable i,end number must be a odd number:

The sum is:44.14465232325222

    /******start******/import java.util.Scanner;public class Main {public static void main(String args[]){double j;double sum=0;System.out.println("Enter a end number as variable i,end number must be a odd number:"  );Scanner sc = new Scanner(System.in);double i = sc.nextDouble();for(j=3;j<i;j=j+2){sum=sum+(j-2)/j;}System.out.print("The sum is:"+sum);} }/******end******/

11.en_ 2017_ p1_ 011 decemal to binary

Write a program that prompts the user to enter a decimal integer and displays its corresponding binary value.

Example：

Enter a decimal:

234

The binary of this decimal is:11101010

    /******start******/import java.util.Scanner;public class Main {public static void main(String[] args){System.out.println("Enter a decimal:");Scanner sc = new Scanner(System.in);int a = sc.nextInt();System.out.println("The binary of this decimal is:"+Integer.toBinaryString(a));//转换成八进制把Binary换成Octal//转换成十六进制把Binary换成Hex//解释:Binary是二进制的意思，Octal是八进制的意思，Hex是十六进制的意思。}}/******end******/

12.en_ 2017_ p1_012 Physics:acceleration

Average acceleration is defined as the change of velocity divided by the time taken to make the change, as shown in the following formula:

Write a program that prompts the user to enter the starting velocity in meters/second, the ending velocity in meters/second, and the time span t in seconds, and displays the average acceleration. Here is a sample run:

Examples：

Enter v0 v1 and t:

5.5 50.9 4.5

The average acceleration is 10.088888888888889

    /******start******/import java.util.*;public class Main {public static void main(String[]args){System.out.println("Enter v0 v1 and t:");Scanner sc = new Scanner(System.in);double v0 = sc.nextDouble();double v1 = sc.nextDouble();double t = sc.nextDouble();double a;a=(v1-v0)/t;System.out.println("The average acceleration is "+a);}}/******end******/

13.en_ 2017_ p1_013 Find future dates(此题代码略长，暂时未想到合适的写法，希望大家不吝赐教)

Write a program that prompts the user to enter an integer for today’s day of the week (Sunday is 0, Monday is 1, . . ., and Saturday is 6). Also prompt the user to enter the number of days after today for a future day and display the future day of the week. Here is a sample run:

Example：

Enter today’s day:

Enter the number of days elapsed since today:

1 27

Today is Monday and the future day is Sunday

    import java.util.Scanner;public class Main {/******start******/public static void main(String[]args){System.out.println("Enter today's day:");System.out.println("Enter the number of days elapsed since today:");Scanner sc = new Scanner(System.in);int today = sc.nextInt();int future= sc.nextInt();int x,y;String a,b="ERROR";x=future%7;y=today+x;switch(today){case 0:switch(y){case 0:case 7:b="Sunday";break;case 1:case 8:b="Monday";break;case 2:case 9:b="Tuesday";break;case 3:case 10:b="Wednesday";break;case 4:case 11:b="Thursday";break;case 5:case 12:b="Firday";break;case 6:b="Saturday";break;default:break;}a="Sunday";System.out.println("Today is "+a+" and the future day is "+b);break;case 1:switch(y){case 0:case 7:b="Sunday";break;case 1:case 8:b="Monday";break;case 2:case 9:b="Tuesday";break;case 3:case 10:b="Wednesday";break;case 4:case 11:b="Thursday";break;case 5:case 12:b="Firday";break;case 6:b="Saturday";break;default:break;}a="Monday";System.out.println("Today is "+a+" and the future day is "+b);break;case 2:switch(y){case 0:case 7:b="Sunday";break;case 1:case 8:b="Monday";break;case 2:case 9:b="Tuesday";break;case 3:case 10:b="Wednesday";break;case 4:case 11:b="Thursday";break;case 5:case 12:b="Firday";break;case 6:b="Saturday";break;default:break;}a="Tuesday";System.out.println("Today is "+a+" and the future day is "+b);break;case 3:switch(y){case 0:case 7:b="Sunday";break;case 1:case 8:b="Monday";break;case 2:case 9:b="Tuesday";break;case 3:case 10:b="Wednesday";break;case 4:case 11:b="Thursday";break;case 5:case 12:b="Firday";break;case 6:b="Saturday";break;default:break;}a="Wednesday";System.out.println("Today is "+a+" and the future day is "+b);break;case 4:switch(y){case 0:case 7:b="Sunday";break;case 1:case 8:b="Monday";break;case 2:case 9:b="Tuesday";break;case 3:case 10:b="Wednesday";break;case 4:case 11:b="Thursday";break;case 5:case 12:b="Firday";break;case 6:b="Saturday";break;default:break;}a="Thursday";System.out.println("Today is "+a+" and the future day is "+b);break;case 5:switch(y){case 0:case 7:b="Sunday";break;case 1:case 8:b="Monday";break;case 2:case 9:b="Tuesday";break;case 3:case 10:b="Wednesday";break;case 4:case 11:b="Thursday";break;case 5:case 12:b="Firday";break;case 6:b="Saturday";break;default:break;}a="Firday";System.out.println("Today is "+a+" and the future day is "+b);break;case 6:switch(y){case 0:case 7:b="Sunday";break;case 1:case 8:b="Monday";break;case 2:case 9:b="Tuesday";break;case 3:case 10:b="Wednesday";break;case 4:case 11:b="Thursday";break;case 5:case 12:b="Firday";break;case 6:b="Saturday";break;default:break;}a="Saturday";System.out.println("Today is "+a+" and the future day is "+b);break;}}/******end******/}

14.en_ 2017_ p1_014 Decimal to hex

Write a program that prompts the user to enter a decimal integer and displays its corresponding hexadecimal value.

Example：

Enter a decimal:

1235

The hex of this decimal is:4D3

    /******start******/import java.util.Scanner;public class Main {public static void main(String[]args){System.out.println("Enter a decimal:");Scanner sc = new Scanner(System.in);int a = sc.nextInt();System.out.println("The hex of this decimal is:"+Integer.toHexString(a).toUpperCase());}}/******end******/