I have a program I'm working on that I'm stuck on and can't really figure out. Basically, I'm supposed to input a word, and have the word be encased in a box of asterisks, which is the main objective. The actual prompt says: Read a string from the keyboard. Output the string centered inside of a box as shown below. The box needs to be resized on each run to assure that it has the correct spacing.
Ex.
Here is my code:
import java.io.*;
import java.util.*;
public class Prog600a
{
public static void main(String[] args)
{
for(int i = 1; i<=3; i++)
{
Scanner kbReader = new Scanner(System.in); //Allows input
System.out.print("Enter a string: ");
String word1 = kbReader.nextLine();
int len1 = word1.length();
for(int x = 0; x<=len1; x++)
{
System.out.print("*");
}
System.out.println();
System.out.print("*");
for(int x = 0; x<len1; x++)
{
System.out.print("\t");
}
System.out.print("*");
System.out.println();
System.out.println("* " + word1 + " *");
System.out.print("*");
for(int x = 0; x<len1; x++)
{
System.out.print("\t");
}
System.out.print("*");
System.out.println();
for(int x = 0; x<len1; x++)
{
System.out.print("*");
}
System.out.println();
}
}
}
I'm using the string method length to determine how long the string is, and print asterisks according to that. However, I can't seem to get the spacing, and my output looks nothing like the one shown. I've been experimenting with the code for a few hours (which is why it's a bit long and may be inefficient ), but can't really seem to get it. The spacing isn't right, and I don't really know how to correctly resize the box on each run. Can someone please provide some guidance? Thanks for all the help!
I spot only tiny problems:
You don't print enough asterisks in the top and the bottom (make it < len1 + 4)
You print tabs instead of spaces (change "\t" to " ").
You don't print enough spaces, change those loops to < len + 2
That's all. My output for input test:
********
* *
* test *
* *
********
Stack Overlow isn't for doing your homework for you. But, I will give you some pointers:
Look at repeat.
A tab character is 4-8 characters long, depending on how you're viewing it. '*' is one character long.
Related
I have this task to display a pyramid as follows:
I wrote the code but unfortunately, the digits are displayed with spaces and order.
public class DisplayPyramid {
//main method declaration. Program entry point which begins its execution
public static void main(String[] args) {
//Create a Scanner object
Scanner input = new Scanner(System.in);
//Prompt the user to enter an integer (number of lines)
System.out.print("Enter the number of lines: ");
int numbers = input.nextInt(); //Read value from keyboard and assign it to numberOfLines
String padding = " ";
//Display pyramid
//for loop to produce each row
for (int rows = 0; rows < numbers ; rows++) {
for (int k = numbers - rows; k >= 1; k--){
System.out.print(k + " ");
}
for (int l = 2; l <= numbers - rows; l++){
System.out.print(" " + l);
}
//Advance to the next line at the end of each rows
System.out.print("\n");
}
} }
And this is my output:
Can you help me figure out what is wrong with code ?
Anyone's help will be much appreciated.
Consider the 1st pass of the outer loop which produces
If we color hint your code, which the first inner loop in red, the second inner loop in green
This will be their corresponding output for each pass
The last pass of the red loop print "1 " and the first pass of green loop print " 2". They combine and become "1 2", which has 2 spaces in between.
The solution as Osama A.R point out, just reverse the printing order of number and space for the green loop and make if follow the red loop pattern. That will make the sequence neat.
Your second for loop prints the spaces first and then the number, however, the spaces have already been added by the first for loop, so just update the second for loop to print the spaces after printing the number.
E.g. your second loop should be like this:
for (int l = 2; l <= numbers - rows; l++){
System.out.print(l + " ");
}
The goal of this assignment was for me to use a 2 Dimensional Array that prints a 3x3 tic tac board. While the instructions say it can have any arrangements on "x", "o", and blank spaces, it turns out it can't all be blank spaces (which my teacher had to specify after a cheeky attempt). Anyways, an example of a sample output would be like this:
Anyways, I decided that maybe I should randomize what fills up the grid (I was told that just doing it is easier and simpler but I can't figure out how to code that). Unfortunately, I'm stuck on how to fulfill the proper format and what fills up inside is mostly blanks and Os. Can someone perhaps suggest a better way to do this or help a bit? Thanks.
public class test {
public static void main(String[] args) {
String[][] tictactoe = new String[3][3];
for(int i = 0; i < 3; i++){
for(int j = 0; j < 3; j++){
int onetwo =(int)(3*Math.random())+1;
if (onetwo == 1){
tictactoe[i][j] = "x";
}
if (onetwo == 2){
tictactoe[i][j] = "o";
}
else{
tictactoe[i][j] = " ";
}
if ( i < 3)
System.out.print(tictactoe[i][j] + " | ");
}
}
System.out.println();
System.out.println("---------");
}
}
}
Thanks again!
Try to declare a string like:
String alphabet = "nxo";
And in your randomise function:
String letter = alphabet.charAt(r.nextInt()); // not sure about the syntax but that would be the logic for getting a random value
Just fill that in your array with your already existing for loops
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So I am a java newb, started last week and have been reading a book. In the book at the end of a chapter it gives a challenge to make a program that will output
*
**
***
I am trying to get it so that it outputs is the number of lines as args (That is correct right?). The issue i am having is it the program will only output a page of asterisks as in:
***************...
The code is
public class Rektifier {
public static void main(String[] args) {
int Lines = 1; // amount of lines i want
int stars = 0; //asterisk i want
int X = 0; //Counter for the asterisks for loop
while (Lines <= Integer.parseInt(args[0])){ //I think I found this on stack overflow, it is to search through the arguments for integers
Lines =+ 1; // increase by 1 for the while loop
stars =+ 1; // do this to increase by 1 for the amount of stars i want, could be any number
for (X = 0; X >= stars; X =+ 1){ // forloop, if x is less than stars it should add * to the end of the line. Then increase x by 1 to add another star until x is equal to star then it should continue
System.out.print("*");
}
System.out.println(); //creates a new line to add on too
}
}
}
You have two loops. The outer while() loop uses Lines as its control variable. This loop decides how many stars are to be printed in each line – therefore Lines should take the values: 1, then 2, then 3, etc... (as for now it does not due to a small typo: so you should replace Lines=+1 with Lines+=1)
Your inner for loop uses X as its control variable. This loop actually prints the number of stars dictated by the Lines variable, so you should correct it to the form:
for (X = 0; X < Lines; X++)
Your variable stars is not necessary in such case.
(btw. refrain from starting variable names with capital letters; this works perfectly but is against tradition).
Or you can simply use for loops. You have nested 2 iterations. For loop is better for this case. Use while when execution count depends on some mutable condition.
public static void main(String[] args) throws IOException {
int lines = 3;
// lines loop
for(int i=0; i<lines; i++){
// stars loop
for(int j=0; j<=i; j++) {
System.out.print("*");
}
System.out.println();
}
}
For this easy learning example you could do string operation to get the result you want
public static void main(String[] args) {
int lineCount = Integer.parseInt(args[0]));
String stars = "";
for (int index = 0; index < lineCount; ++index) {
stars += "*";
System.out.println(stars);
}
}
This will produce the following output for arg = 10:
*
**
***
****
*****
******
*******
********
*********
**********
Every iteration the stars string will append a star to the existing stars.
There's answers here but they aren't pointing out the actual bugs in your code. I'll point out the bugs in your code. First and foremost:
What you need to do is first think of what the pseudocode looks like. It should look like this.
for (line_number ... number of lines):
for(0...line_number)
print star
print newline.
Here's the bugs in your code with comments in the lines:
public class Rektifier {
public static void main(String[] args) {
int Lines = 1;
int stars = 0; //This is not useful. The number of stars will always be equal to the number of lines. Why not just use the number of lines?
int X = 0; //Would rather that you utilize the for loop for declaring X, it is only used there.
while (Lines <= Integer.parseInt(args[0])){
Lines =+ 1; // Increment at the end of the while loop. Otherwise, you print two stars on the first line.
stars =+ 1; // Again not used.
for (X = 0; X >= stars; X =+ 1){ // your for loop is wrong; it reads like this. for x = 0 and x is bigger than stars, do blah. then you don't actually increment X because it should be X += 1 not X =+ 1.
System.out.print("*");
}
System.out.println(); //creates a new line to add on too
}
}
}
Here's a working implementation of your code using the same structure you are using.
public static void main(String[] args) {
int lines = 1;
while (lines <= Integer.parseInt(args[0])){
for (int x = 0; x < lines; x += 1){
System.out.print("*");
}
lines += 1;
System.out.println();
}
}
I need to produce a triangle as shown:
1
22
333
4444
55555
and my code is:
int i, j;
for(i = 1; i <= 5; i++)
{
for(j = 1; j <= i; j++)
{
System.out.print(i);
}
System.out.print("\n");
}
Producing a triangle the opposite way
1
22
333
4444
55555
What do i need to do to my code to make it face the right way?
You need 3 for loops:
Upper-level loop for the actual number to be repeated and printed
first inner level for printing the spaces
second inner level for to print the number repeatedly
at the end of the Upper-level loop print new line
Code:
public void printReversedTriangle(int num)
{
for(int i=0; i<=num; i++)
{
for(int j=num-i; j>0; j--)
{
System.out.print(" ");
}
for(int z=0; z<i; z++)
{
System.out.print(i);
}
System.out.println();
}
}
Output:
1
22
333
4444
55555
666666
I came across this problem in my AP CS class. I think you may be starting to learn how to program so heres what I'd do without giving you the answer.
Use a loop which removes the number of spaces each iteration. The first time through you would want to print four spaces then print 1 one time(probably done in a separate loop).
Next time through one less space, but print i one more time.
You need to print some spaces. There is a relation between the number of spaces you need and the number (i) you're printing. You can print X number of spaces using :
for (int k = 0; k < numSpaces; k++)
{
System.out.print(" ");
}
So in your code:
int i, j;
for(i = 1; i <= 5; i++)
{
// Determine number of spaces needed
// print spaces
for(j = 1; j <= i; j++)
{
System.out.print(i);
}
System.out.print("\n");
}
use this code ,
int i, j,z;
boolean repeat = false;
for (i = 1; i <= 5; i++) {
repeat = true;
for (j = 1; j <= i; j++) {
if(repeat){
z = i;
repeat = false;
while(z<5){
System.out.print(" ");
z++;
}
}
System.out.print(i);
}
{
System.out.print("\n");
}
}
You can use this:
int i, j;
int size = 5;
for (i = 1; i <= size; i++) {
if (i < size) System.out.printf("%"+(size-i)+"s", " ");
for (j = 1; j <= i; j++) {
System.out.print(i);
}
System.out.print("\n");
}
This line:
if (i < size) System.out.printf("%"+(size-i)+"s", " ");
Is going to print the left spaces.
It uses the old printf with a fixed sized string like 5 characters: %5s
Try it here: http://ideone.com/jAQk67
i'm having trouble sometimes as well when it's about formatting on console...
...i usually extract that problem into a separate method...
all about how to create the numbers and spacing has been posted already, so this might be overkill ^^
/**
* creates a String of the inputted number with leading spaces
* #param number the number to be formatted
* #param length the length of the returned string
* #return a String of the number with the size length
*/
static String formatNumber(int number, int length){
String numberFormatted = ""+number; //start with the number
do{
numberFormatted = " "+numberFormatted; //add spaces in front of
}while(numberFormatted.length()<length); //until it reaches desired length
return formattedNumber;
}
that example can be easily modified to be used even for Strings or whatever ^^
Use three loops and it will produce your required output:
for (int i=1;i<6 ;i++ )
{
for(int j=5;j>i;j--)
{
System.out.print(" ");
}
for(int k=0;k<i;k++)
{
System.out.print(i);
}
System.out.print("\n");
}
Your code does not produce the opposite, because the opposite would mean that you have spaces but on the right side. The right side of your output is simply empty, making you think you have the opposite. You need to include spaces in order to form the shape you want.
Try this:
public class Test{
public static void main (String [] args){
for(int line = 1; line <= 5; line++){
//i decreases with every loop since number of spaces
//is decreasing
for(int i =-1*line +5; i>=1; i--){
System.out.print(" ");
}
//j increases with every loop since number of numbers
//is decreasing
for(int j = 1; j <= line; j++){
System.out.print(line);
}
//End of loop, start a new line
System.out.println();
}
}
}
You approached the problem correctly, by starting with the number of lines. Next you have to make a relation between the number of lines (the first for loop) and the for loops inside. When you want to do that remember this formula:
Rate of change*line + X = number of elements on line
You calculate rate of change by seeing how the number of elements change after each line. For example on the first line you have 4 spaces, on the second line you have 3 spaces. You do 3 - 4 = -1, in other words with each line you move to, the number of spaces is decreasing by 1. Now pick a line, let's say second line. By using the formula you will have
-1(rate of change) * 2(line) + X = 3(how many spaces you have on the line you picked).
You get X = 5, and there you go you have your formula which you can use in your code as you can see on line 4 in the for loop.
for(int i = -1 * line +5; i >= 1; i--)
You do the same for the amount of numbers on each line, but since rate of change is 1 i.e with every line the amount of numbers is increasing by 1, X will be 0 since the number of elements is equal to the line number.
for(int j = 1; j <= line; j++){
I have a fairly simple question regarding Java. I am currently learning Java and one of the homework questions has me stumped. The goal is to create a triangle with the little figure. I believe I have the idea down however, I cannot get the whole figure of the guy to move to the right.
The code I have so far is:
public class LittleGuy {
public static final int NUMBER_OF_GUYS = 5; // determines the number of guys.
public static void main(String[] args) {
for (int line = 1; line <= NUMBER_OF_GUYS; line++){
for (int j = 1; j <= (-5 * line + 25); j++){// uses the algorithm.
System.out.print(" ");
}
guy();
}
}
public static void guy(){
System.out.print(" o ******\n /|\\ *\n / \\ *");
System.out.println();
}
}
Basically, the body and the head aren't supposed to be separated. I'm having trouble keeping them together. I am assuming that it is a fairly simple fix I am either unaware of or completely over looking. Any information or thought would be greatly appreciated. Thanks again.
You are only printing out the spaces before the first line of your little guy, inside the guy() method, you are still printing the rest of the guy on the first line.
I'd suggest making a printSpaces(int numSpaces) method which prints numSpaces spaces, and changing the guy method to take the number of spaces to print at the beginning of each line.
public class LittleGuy {
public static final int NUMBER_OF_GUYS = 5; // determines the number of guys.
public static void main(String[] args) {
for (int line = 1; line <= NUMBER_OF_GUYS; line++){
int counter=0;
for (int j = 1; j <= (-5 * line + 25); j++){// uses the algorithm.
System.out.print(" ");
counter++;
}
guy(counter);
}
}
public static void guy(int count){
System.out.print(" o ******");
System.out.print("\n");
for(int i=0;i<count;i++)
System.out.print(" ");
System.out.print("/|\\ *");
System.out.print("\n");
for(int i=0;i<count;i++)
System.out.print(" ");
System.out.print("/ \\ *");
System.out.println();
}
}
The problem was : In the guy() method you use \n to print the guy. But it will not take care of the white-spaces you printed in-order to achieve your algorithm (inside the for loop).
How it was solved : place a counter in the for loop to count how many white-spaces were printed and use that counter in the guy() method to print required white-spaces.