homework02 conditionalstatements loops

8/9/2019 Homework02 ConditionalStatements Loops

1/3

Homework 2: Conditional statements (if, switch) Loops

(for, while, do while)

1. Write a program that enters co-ordinates of three points A(x0,y0), B(x1, y1), C(x2, y2),

checks if they are three a!id ertex co-ordinates of a triang!e

2. Write a program that enters a month, year, prints o"t n"m#er of days in the month

o $t is kno%n

o month 1,&,',,,10,12 * n"m#er of days is &1

o month +,,,11 * n"m#er of days is &0

o month 2 * n"m#er of days of !eap year* 2

* n"m#er of days of the others* 2o !eap year is year +00 // 0

or year + // 0 and year 100 / 0

&. Write a program that enters a day, month, year, checks if it is a!id

+. Write a program that prints o"t fo!!o%ing text*

What is o"r co"ntrys name at the inh 3ien 4oang age5

a. 6an !ang

#. ai co iet

c. An namAnd reads a character from the command !ine

$f that character is 7B8 or 7#8 then prints o"t 76ery good8

9ther%ise prints o"t 7:o" are %rong. ;ood !"ck to yo" next time8

'.


2/3

1

2 1

& 2 1

+ & 2 1

' + & 2 1

. Write an a!gorithm to accept a n"m#er #et%een 1 and and disp!ay a pyramid. ?or

examp!e, if the n"m#er entered is ', the fo!!o%ing pyramid %i!! #e disp!ayed*

1

1 2 1

1 2 & 2 1

1 2 & + & 2 1

1 2 & + ' + & 2 1

. Write a program to read an integer n"m#er (n>0). Write fo!!o%ing methods*

- Checking %hether a n"m#er is a perfect n"m#er or not5

- ;enerate the first n perfect n"m#ers.

. Write a method to enter a integer n"m#er (n>0) and resere that n"m#er.

Guide:3he reerse n"m#er is an integer n"m#er so"rce from the orgine one #"t the

order of digits are reersed.

Example: 3he reerse n"m#er of*

12&+' is '+&21

200 is 002

10 is 1

&00+00 is +00&

10. Write a method to check %hether a a!id n"m#er or not5

Guide: 3he a!id n"m#eris a positie integer n"m#er %hich has & digits. 9ther%ise

is ina!id n"m#er

Example:

12& is a!id

2& -> ina!id

+' -> ina!id

Input* an integer n"m#er from key#oard

Output*


3/3

- $f the inp"t n"m#er is ina!id (kh@ng hp !), print o"t to conso!e the

message* DEAF

- $f the inp"t n"m#er is a!id print o"t the reerse n"m#er of the inp"t.

Example

Input* 01

Output* DEA

---

Input* 0

Output*

11. Write a program to find 4ighest Common ?actor (4C?) and Geast Common

H"!tip!e of t%o integer n"m#ers.

12. Write an a!gorithm to find the 4ighest Common ?actor (4C?) of three n"m#ers.

Input* 3hree integer n"m#ers from key#oard

Output* 4ighest Common ?actor (4C?) of three n"m#ers.

Example

Input* 2' 1' '

Output* '

---

Input 2 +

Output 1

13. Io!e !inear eJ"ation in one variable

#x K c / 0

Note: creat the folloing constructors:

public !inearE"uation#$

public !inearE"uation#float b% float c$

1&. Io!e sJ"are eJ"ation in one variable

ax2K #x K c / 0

public '"uareE"uation#$

public '"uareE"uation#float a% float b% float c$

homework02 conditionalstatements loops

Documents