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I made this program on C,and I have no idea of Java (new-yοung developer).Can you help me to "translate" it on Java?
#include<stdio.h>
#include<stdlib.h>
#include<graphics.h>
void printbin(int num)
{
int binnum;
binnum=num%2;
num=num/2;
if (num!=0) printbin(num);
printf("%d",binnum);
return;
system("pause");
}
int main(void)
{
int posnumber,binnum;
printf("Give a number : ");
scanf("%d",&posnumber);
printbin(posnumber);
printf("\n");
return 0;
}
You can learn from this code, hope this can help you:
//here is comments in java
package help;
import java.util.Scanner;
//this is the way how you can all the libraries in java so
/*
#include<stdio.h>
#include<stdlib.h>
#include<graphics.h>
*/
//here name of your class
public class Help {
//here name of your methode
public static void printbin(int num) {
int binnum;
binnum = num % 2;
num = num / 2;
if (num != 0) {
printbin(num);
}
System.out.println(binnum);
}
//here is the main methode in java
public static void main(String args[]) {
int posnumber, binnum;
Scanner scan = new Scanner(System.in);
System.out.println("Give a number : ");
posnumber = scan.nextInt();
System.out.println(posnumber);
}
}
Good luck, and good start with java :)
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I am new to java, why a, b,c initialization are wrong in the following code.
public static void main(String[] args) {
if (args.length < 2)
throw new IllegalArgumentException ("we need 2 argumeents");
else {
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
int c = a+b;
}
System.out.println(a + " + " + b + " = " + c);
}
Java works differently compared to JavaScript. Every {} block has an own variable scope. Variables defined inside a block are not visible outside.
public static void main(String[] args) {
{
int x=1;
System.out.println(x); // prints 1
}
{
int x=2;
System.out.println(x); // prints 2
}
// System.out.println(x); // error: cannot find symbol
}
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Basically I have to write a program that uses data that was inputted by the user and put it in a mathematical formula so it spits out an answer. The formula has to be created as a method. This is what I have so far. When I run the code it lets me input a number, but when I do that the program does not output anything and it just finishes running.
import java.util.Scanner;
public class Namek {
static int myMethod(int radius) {
return ((radius * radius) * (22/7));
}
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter Radius");
String radius = keyboard.nextLine();
}
private static void myMethod() {
}
You need to call the method passing the radius as parameter of the method. You can check https://www.tutorialspoint.com/java/java_methods.htm
,this link to see how to create and call methods with parameters.
I think what you wanted to do is the following:
import java.util.*;
public class Namek {
static int myMethod(int radius) {
return ((radius * radius) * (22/7));
}
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter Radius");
int radius = Integer.valueOf(keyboard.nextLine());
int area = myMethod(radius);
System.out.println(area);
}
}
Below is what you were trying to do I think
public class Formula {
static int myMethod(int radius) {
return ((radius * radius) * (22/7));
}
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter Radius");
int radius = Integer.valueOf(keyboard.nextLine());
float output = myMethod(radius);
System.out.println(output);
}
}
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Write a Java program with a recursive method that accepts a value i as input and computes the sum:
m(i) = 1/3 + 2/5 + 3/7 + 4/9 + 5/11 + ... + i/(2i + 1)
So far I have:
import java.util.Scanner;
public class Recursion {
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
System.out.println("Enter an i: ");
int i = sc.nextInt();
if (i == 0) {
System.out.println(0);
}
else {
System.out.println(i / (2 * i + 1) + (main(i-1)));
}
}
}
The code isn't compiling. Please help!!
Ok I think I finally understand what you're trying to do! The problem is you're actually trying to build a string! The method is doing what it should, your return just isn't really doing what it should.
import java.util.Scanner;
public class Recursion
{
private static String result = null;
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.println("Enter an i: ");
int i = sc.nextInt();
System.out.println(recursion(i));
}
public static String recursion(int i)
{
if(i != 0)
{
if(result == null)
{
result = (i + "/" + (2 * i + 1));
recursion(i - 1);
}
else
{
result = result.concat(" + ").concat(i + "/" + (2 * i + 1));
recursion(i - 1);
}
}
return result;
}
}
Please let me know if this does what you want it to!
You shouldn't use recursion on the main function. Just create a second function that isn't the main and it should work:
import java.util.Scanner;
public class Recursion {
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
System.out.println("Enter an i: ");
int i = sc.nextInt();
System.out.println(recursion(i));
}
public int recursion(int i){
if (i == 0) {
return 0;
}
else {
return (i / (2 * i + 1) + (recursion(i-1)));
}
}
}
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Here is my code. I got an error as ".class expected".
What should I do to rectify it.
import java.util.*;
class Atm2
{
public static void main (String args[])
{
Scanner in = new Scanner(System.in);
System.out.println("Enter the amount to be withdrawed");
int withdraw = in.nextInt();
System.out.println("Enter the amount in the account");
double acnt_balc = in.nextDouble();
if ((withdraw % 5 == 0) && (acnt_balc >= withdraw + 0.50))
double cur = acnt_balc - (withdraw + 0.50);
System.out.println(cur);
else
System.out.println(acnt_balc);
}
}
Try curly braces in the context of your if-else.
It should look like this:
if (isMoving) {
currentSpeed--;
} else {
System.err.println("The bicycle has already stopped!");
}
So you can see, that there is a if-block and a else-block. You have to say which code belongs to if and which belongs to else. You can do that with the braces.
Scanner requires you to import java.util.*;
I tried it works and also format properly , see below , it runs
import java.util.*;
class Atm2
{
public static void main (String args[])
{
Scanner in = new Scanner(System.in);
System.out.println("Enter the amount to be withdrawed");
int withdraw = in.nextInt();
System.out.println("Enter the amount in the account");
double acnt_balc = in.nextDouble();
if ((withdraw % 5 == 0) && (acnt_balc >=(withdraw + 0.50)))
{
double cur=(acnt_balc-(withdraw + 0.50));
System.out.println(cur);
}
else
{
System.out.println(acnt_balc);
}
}
}
Also make sure your Filename is the same as class name , in this case Atm2.java
The Scanner Class in present in the 'java.util' package , since you forgot to import it and used Scanner sc=new Scanner(); the compliler is complaining, and remember to compile use javac filename.java , to run use java filename
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I want to output 99 multiplication table not use the loop. Do not say only use 'system.out.print'.
public class NextDiGui {
public static void main(String[] args) {
row();
}
static int num1 =0, num2 =1;
public static void row(){
num1++;
if(num1<10){
col();
}
}
public static void col(){
if(num2<=num1){
System.out.print(num1+"*"+num2+"="+num1*num2+"\t");
num2++;
col();
}
else{
num2=1;
System.out.println();
row();
}
}
}