This program asks to list out all the possible years which are leap years from 2014 to 2114, which I did correctly in the program shown below and the years to be listed with a space in each with 10 in every row. Once 10 years are listed, you go to the next. line. The only problem which I notice is that there are 3 empty lines between every 10 rows of years. How can I alter the program so there are no spaces between these rows.
public class fiveTwoSeven {
public static void main(String[] args)
{
int year2 = 2114;
int count = 0;
for (int year1 = 2014; year1 <= year2; year1++)
{
if (year1 % 4 == 0 && !(year1 % 100 == 0))
{
System.out.print(year1 + " ");
count++;
}
if (count % 10 == 0 && !(count == 0))
{
System.out.println();
}
}
}
}
Just change your second if condition block to this:
if (count % 10 == 0 && !(count == 0))
{
System.out.println();
count = 0;
}
It is creating problem when count is 10 or 20 or 30 or ....
I am giving explanation for 10...
From 2014, according to your logic 10th leap year is 2052. So after printing 2052, you are printing a new line. And for 2053, 2054 and 2055, your count is still 10. So second if block is printing another new line for each one.
Try it:
if (count % 10 == 0 && !(count == 0))
{
System.out.println();
count = 0;
}
Or
int year2 = 2114;
int count = 0;
for (int year1 = 2014; year1 <= year2; year1++)
{
if (year1 % 4 == 0 && !(year1 % 100 == 0))
{
count++;
System.out.print(year1 + " ");
if(count % 10 == 0 && !(count == 0)) {
System.out.println();
count = 0;
}
}
}
Output:
Note:
You just need to reset the value of count after it reaches to 10 so that cursor goes to the next line.
You should only println() in your if block (since that is when you output leap years). More importantly, your algorithm has a bug. Years that are multiples of 400 are leap years (2000 and 2400 are both leap years). I suggest you save the leap year as a local boolean. Something like,
public static void main(String[] args) {
int count = 0, year1 = 2014, year2 = 2114;
for (; year1 <= year2; year1++) {
boolean leapYear = false;
if (year1 % 4 == 0) {
if (year1 % 100 != 0) {
leapYear = true;
} else if (year1 % 400 == 0) {
leapYear = true;
}
}
if (leapYear) {
System.out.print(year1 + " ");
count++;
if (count % 10 == 0) {
System.out.println();
}
}
}
}
Related
My do-while loop is supposed to print out numbers from 1 - 106 (including 1 and 106)
whats supposed to happen:
multiples of 3 are supposed to print out Big,
multiples of 5 are supposed to print out Mean,
multiples of 7 are supposed to print out Bugs,
multiples of 3 and 5 are supposed to print out BigMean,
multiples of 3 and 7 are supposed to print out BigBugs,
multiples of 5 and 7 are supposed to print out MeanBugs,
multiples of 3, 5 and 7 are supposed to print out BigMeanBugs.
What actually happens:
my do-while loop only runs the first "if" statement. Any help?
My code:
public static void main(String [] args){
int i = 0;
do{
++i;
if(i %3 == 0){
System.out.print("Big, ");
if(i %5 ==0){
System.out.print("Mean, ");
}
if(i %7 ==0){
System.out.print("Bugs, ");
}
if((i %3 == 0) && (i %5 == 0)){
System.out.print("BigMean, ");
}
if((i %3 == 0) && (i %7 == 0)){
System.out.print("BigBugs, ");
}
}else if((i %5 == 0) && (i %7 == 0)){
System.out.print("MeanBugs, ");
}else if((i %3 == 0) && (i %5 == 0) && (i %7 ==0)){
System.out.print("BigMeanBugs, ");
}else{
System.out.print(i + " ");
}
}while(i<=106);
}//closing main
As I could see your problem is probably that your if-statements are inside of first if-statement, so maybe you want this:
public class BigMeanBugsDoWhileLoop
{
public static void main(String [] args)
{
int i = 0;
do
{
++i;
boolean bug = false;
String result = "";
if(i %3 == 0)
{
result += "Big";
bug = true;
}
if(i %5 ==0)
{
result += "Mean";
bug = true;
}
if(i %7 ==0)
{
result += "Bugs";
bug = true;
}
if(!bug)
{
System.out.println(i + "");
}
else
{
System.out.println(result);
}
}while(i<106);
}//closing main
} // closing class
You don't need other if-statements because you don't use break so other expressions will be evaluated before next iteration.
First, if something is divisible by 3 and 7 it is divisible by 21.
Second, if you reverse the order, you will catch divisible by 3 and 5 before divisible by 3 or 5 separately (assuming that is what you want). If you do it the other way you may print the values prematurely or miss them altogether before checking the other possible factors. This behavior is also dependent on if vs if/else if statements.
I have limited the printout to 25 to avoid a long list. Modify as you see fit.
public class BigMeanBugsDoWhileLoop {
public static void main(String[] args) {
int i = 1;
do {
String bugType = "";
if (i % 105 == 0) {
bugType = "BigMeanBugs"; // 3 5 7
} else if (i % 35 == 0) {
bugType = "MeanBugs"; // 5 7
} else if (i % 21 == 0) {
bugType = "BigBugs"; // 3 7
} else if (i % 15 == 0) {
bugType = "BigMean"; // 3 5
} else if (i % 7 == 0) {
bugType = "Bugs"; // 7
} else if (i % 5 == 0) {
bugType = "Mean"; // 5
} else if (i % 3 == 0) {
bugType = "Big"; // 3
}
System.out.println(bugType.isEmpty() ? i : bugType);
i++;
} while (i <= 25);
}// closing main
} // closing class
Prints this.
1
2
Big
4
Mean
Big
Bugs
8
Big
Mean
11
Big
13
Bugs
BigMean
16
17
Big
19
Mean
BigBugs
22
23
Big
Mean
You have to increment the value of i in the end of loop
public static void main(String [] args){
int i = 1;
do{
if(i %3 == 0){
System.out.print("Big, ");
if(i %5 ==0){
System.out.print("Mean, ");
}
if(i %7 ==0){
System.out.print("Bugs, ");
}
if((i %3 == 0) && (i %5 == 0)){
System.out.print("BigMean, ");
}
if((i %3 == 0) && (i %7 == 0)){
System.out.print("BigBugs, ");
}
}else if((i %5 == 0) && (i %7 == 0)){
System.out.print("MeanBugs, ");
}else if((i %3 == 0) && (i %5 == 0) && (i %7 ==0)){
System.out.print("BigMeanBugs, ");
}else{
System.out.print(i + " ");
}
i++;
}while(i<=106);
}//closing main
} // closing class
I am a Java student and I am having trouble with nesting the conditional statement of this program
Exercise CozaLozaWoza (Loop & Condition): Write a program called
CozaLozaWoza which prints the numbers 1 to 110, 11 numbers per line.
The program shall print "Coza" in place of the numbers which are
multiples of 3, "Loza" for multiples of 5, "Woza" for multiples of 7,
"CozaLoza" for multiples of 3 and 5, and so on. The output shall look
like:
1 2 Coza 4 Loza Coza Woza 8 Coza Loza 11
Coza 13 Woza CozaLoza 16 17 Coza 19 Loza CozaWoza 22
23 Coza Loza 26 Coza Woza 29 CozaLoza 31 32 Coza
......
I manage to do this
public class CozaLozaWoza {
public static void main(String[] args) {
for (int x = 1; x <= 110; x +=1) {
if (x % 3 == 0) {
System.out.print(" Coza");
}else if (x % 5 == 0) {
System.out.print(" Loza");
}else if (x % 7 == 0) {
System.out.print(" Woza");
}else if (x % 3 != 0 && x % 5 != 0 && x % 7 != 0) {
System.out.print(" " + x);
}
if (x % 11 == 0) {
System.out.println();
}
}
}
}
I can't merge the last if statement, can anyone help me? thank you
The if statements should be independent of each other, since more than one statement can be true for the same number (for example "CozaLoza" for multiples of 3 and 5).
for (int x = 1; x <= 110; x +=1) {
boolean regular = true;
System.out.print (" ");
if (x % 3 == 0) {
System.out.print("Coza");
regular = false;
}
if (x % 5 == 0) {
System.out.print("Loza");
regular = false;
}
if (x % 7 == 0) {
System.out.print("Woza");
regular = false;
}
if (regular) {
System.out.print(x);
}
if (x % 11 == 0) {
System.out.println();
}
}
package homePrac;
public class LOZAMOZACOZA
{
public static void main (String []args)
{
int max = 110;
for (int i=1; i<=max; i++)
{
if (i%3==0)
System.out.print("Coza");
else if (i%5==0)
System.out.print ("Woza");
else if (i%7==0)
System.out.print("CozaLoza");
else if (i%3!=0 || i%5!=0 || i%7!=0)
System.out.print(i);
if(i%11==0)
System.out.println("");
}
}
}
Please help with formatting my output.
I have been asked to "Write a program that displays all the leap years, ten per line, in the twenty-first century (from 2001 to 2100), separated by exactly one space".
Although I get the right results, it's not in the required format.
Thanks in advance
public class Leapyear {
public static void main(String[] args) {
//declare variabls;
int year;
int count=1;
int yearsperline = 10;
//loop
for(year=2001;2001<=2100;year++){
if((year%4==0 && year%100!=0) || (year%400==0))
System.out.print(year+",");
if ( year ==2100)
break;
while (count%10==0)
System.out.println();
}
}
}
You can write something like this:
//declare variables;
final int YEARS_PER_LINE = 10;
final int START_YEAR = 2001;
//loop
for(int year = START_YEAR; year <= 2100; year++){
System.out.print(year);
if((year - START_YEAR) % YEARS_PER_LINE == (YEARS_PER_LINE - 1)) {
System.out.println();
} else {
System.out.print(",");
}
}
Try this one:
public class LeapYear
{
public static void main(String[] args)
{
// declare variables
final int startYear = 2001;
final int endYear = 2100;
final int yearsPerLine = 10;
// loop
for (int year = startYear, count = 0; year <= endYear; year++)
{
if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
{
if (count % yearsPerLine != 0)
System.out.print(" ");
else if (count > 0 && count % yearsPerLine == 0)
System.out.println();
System.out.print(year);
++count;
}
}
}
}
int startFromYear = 2001;
int stopAtYear = 2100;
int count = 0;
for(int i = startFromYear; i <= stopAtYear; i++){
if((i % 4 == 0 && i % 100 != 0)||(i % 400 == 0)){
System.out.print(i + " ");
count++;
if(count % 10 ==0)
System.out.println();
}
}
100% correct! and easy to understand.
public class LeapYears
{
public static void main(String[] args)
{
int count = 0;
for(int i = 2001; i <= 2100; i++)
{
if ((i % 4 == 0 && i % 100 != 0)||(i % 400 == 0))
{
count++;
//if count is 10 then start a new line.
if(count % 10 == 0)
{
System.out.println(i);
}
//if count is smaller 10 then in the same line
else
{
System.out.print(i + " ");
}
}
}
}
}
Here's my code so far
public class DivisibleBy5and6
{
public static void main (String []args)
{
for (int i = 100; i <= 200; i++)
{
boolean num = (i % 5 == 0 || i % 6 == 0) && !(i % 5 == 0 && i % 6 == 0);
if (num == true)
System.out.println(i + " is divisible");
}
}
}
Like stated previously how can I get the output to print out 10 items per line separated by a space?
How about:
int count = 0;
for (int i = 100; i <= 200; i++) {
boolean num = (i % 5 == 0 || i % 6 == 0) && !(i % 5 == 0 && i % 6 == 0);
if (num == true) {
count++;
System.out.print(i + " is divisible ");
if(count >= 10) {
System.out.println();
count -= 10;
}
}
}
I am writing a simple java program to find the smallest number which is divisible by all the numbers from 1 to 20.
I have written the following code:
package smallmultiple;
public class SmallMultiple {
public static void main(String[] args) {
int sml = 0;
outerloop:
for (int i = 40; i < 100000; i++) {
int j=1;
do {
if(i%j==0)
j++;
} while(j<21);
if(j==20) {
sml=i;
break outerloop;
}
}
System.out.println(sml);
}
}
It is not giving any error but it is not giving any output.
You can try this which is a bit faster than yours solution:-
for(int i = 190; ; i += 190) {
if(i % 3 == 0
&& i % 4 == 0
&& i % 6 == 0
&& i % 7 == 0
&& i % 8 == 0
&& i % 9 == 0
&& i % 11 == 0
&& i % 12 == 0
&& i % 13 == 0
&& i % 14 == 0
&& i % 15 == 0
&& i % 16 == 0
&& i % 17 == 0
&& i % 18 == 0
&& i % 20 == 0) {
System.out.println(i);
break;
}
}
You can also check out this article.
You are incrementing j only if i is perfectly divisible by j. Shouldn't you break or exit the do.. while loop of atleast one number is not divisible? Not doing so is causing infinite loop I believe. It should be something like
if(i%j==0) {
j++;
}
else {
break;
}
its simple. Let me explain your loop. First, i = 40 and j = 1, its ok. Then j++.Next i = 40 and j = 2, its still correctly. Then j++ again. Now i = 40, j = 3 and i%j !=0 => j cannot ++ and j still equal 3. And you see, j = 3 is still satisfy your loop ( j < 21) then it loop and loop forever. This is the reason why you cant get any output. You can use your IDE debugging to find this mistake. Sorry my English not good.
In java, to respect the object oriented best practise, it's not advised to user labels, try this :
public class NumberTool {
public static void main(String[] args) {
System.out.println("Smallest number is : " + getSmallestNumberDividedByOneToTwnety());
}
public static int getSmallestNumberDividedByOneToTwnety() {
for ( int i = 40; i <= 2147483647; i++) {
if (isNumberDivdedByOneToTwenty(i)) {
return i;
}
}
return 0;
}
public static boolean isNumberDivdedByOneToTwenty(int numberToTest) {
for (int i = 1; i <= 20; i++) {
if (numberToTest % i != 0) {
return false;
}
}
return true;
}
}
Output is:
Smallest number is : 232792560