Java Patterns Set

7/23/2019 Java Patterns Set

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Patterns Set

Q1. Write a program that asks the user to enter a character (ch) and an integer (n), and print the

character entered n times on the same line.

Example:

[15 marks]

A1.

import java.util.*;

class Q0101

{

public static void main(String[] args)

{

// user input

Scanner sc = new Scanner( System.in );

char ch;

int n;

String temp;

System.out.print("Enter a character and an integer: ");

ch = sc.next().charAt(0);

n = sc.nextInt();

temp = sc.nextLine(); // for the trailing newline

// print the patternint i;

for(i=1; i


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import java.util.*;

class Q0102

{


{

// user input


int n;

String temp;

System.out.print("Enter an integer: ");

n = sc.nextInt();


// print the pattern

int i;

char ch = 'A';

for(i=1; i


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int n;

String temp;


n = sc.nextInt();



int i, j;

char ch = 'A';

for(i=1; i


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A4.

import java.util.*;

class Q0104

{


{// user input


char ch;

int n;

String temp;



n = sc.nextInt();



int i, j;

char c; // running character to print

for(i=1; i


5/16

[15 marks]

A5.

import java.util.*;

class Q0105

{


{

// user inputScanner sc = new Scanner( System.in );

char ch;

int n;

String temp;



n = sc.nextInt();



int i, j;

for(i=1; i


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Sample output:

Q6. Write a program that asks the user to enter a character (ch), and the integer length and the

breadth values. Print an open rectangle having size length and breadth using character ch.

[15 marks]

A6.

import java.util.*;

class Q0106

{


{// user input


char ch;

int length, breadth;

String temp;

System.out.print("Enter a character: ");

ch = sc.nextLine().charAt(0);

System.out.print("Enter length and breadth: ");

length = sc.nextInt();

breadth = sc.nextInt();


// print the patternint i, j;

for(i=1; i


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{

printChar(ch, 1);

printChar(' ', breadth-2);

printChar(ch, 1);

System.out.println();

}

}

}

// utility method to print ch, width times

public static void printChar(char ch, int width)

{

int i;

for(i=1; i


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char ch;

int n = 0;

String temp;

System.out.print("Enter a character: ");

ch = sc.nextLine().charAt(0);

while( (n%2) != 1 ) // until an odd number is entered

{

System.out.print("Enter an odd integer: ");

n = sc.nextInt();


if( (n%2) != 1 )

System.out.println("Enter an odd integer only. Try again!");

}


int i, j;

int centerLine = (n+1)/2;

for(i=1; i


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Q8. Write a menu-driven program that prints:

i) An unfilled triangle: ask the number of rows and the character to use for printing

ii) A filled triangle: ask the number of rows and the character to use for printing

A8.

import java.util.*;

class Q0108

{


{

char menuOption = ' '; // space

do

{
http://www.computerapplicationsicse.com/wp-content/uploads/2013/09/Pattern0108.pnghttp://www.computerapplicationsicse.com/wp-content/uploads/2013/09/Pattern0107.pnghttp://www.computerapplicationsicse.com/wp-content/uploads/2013/09/Pattern0108.pnghttp://www.computerapplicationsicse.com/wp-content/uploads/2013/09/Pattern0107.png


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menuOption = askMenuOption();

switch(menuOption)

{

case 'U':

doUnfilledTriangle();

break;

case 'F':

doFilledTriangle();

break;

case 'X':

System.out.println("Exiting program. Thank you!");

break;

}

}while( menuOption != 'X' );

}

// ask user to enter menu option

// if wrong option entered, ask again

public static char askMenuOption()

{

char option = ' '; // space

do{

option = askChar("Enter U for Unfilled, F for Filled, X to Exit:

");

option = Character.toUpperCase(option);

if("UFX".indexOf(option) < 0)

System.out.println("Incorrect option. Try again...");

}while("UFX".indexOf(option) < 0);

return option;

}

// utility method to display the prompt

// and ask to enter a character

// return the character entered

public static char askChar(String prompt)

{


System.out.print(prompt);

char ch = sc.nextLine().charAt(0);

return ch;

}

// utility method to display the prompt

// and ask to enter an integer

// return the int entered

public static int askInt(String prompt)

{

Scanner sc = new Scanner( System.in );System.out.print(prompt);

int n = sc.nextInt();

String temp = sc.nextLine(); // for the trailing newline

return n;

}

// utility method to print a char ch, n times

public static void printChar(char ch, int n)

{


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int i;

for(i=1; i


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Q9. Write a program that asks the user to enter an integer (n) and print the following pattern as

shown in the example below:

A9.

import java.util.*;

class Q0109

{


{

// user inputScanner sc = new Scanner( System.in );


int n = sc.nextInt();

String temp = sc.nextLine(); // for the trailing newline


char ch = 'A';

int i, j;

for(i=1; i


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{

for(j=1; j


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int i, j;

for(i=n; i>=1; i--)

{

for(j=1; j


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for(i=n; i>=1; i--)

{

ch = 'A'; // each line starts with 'A'

for(j=1; j


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int i, j;

for(i=n; i>=1; i--)

{

ch = (char)('A' + n - 1); // each line starts with 'A'

for(j=1; j

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Java Patterns Set