[1][I write a simple program in dart to print multiplication table but the output was not I Except][1]
void main{
int num=10;
for(var i=1;i<=10;++i){
print('$num*$i=$num');
}
}
this was my code
Finally I found the answer
var num = 10;
for (var i = 1; i < 10; i++) {
print("$num * $i = ${num * i}");
}
any other ways to print multiplication table in dart using for loop
You forget to add the parenthesis in the main function which acted like a function declaration.
And you also missed to multiply the result of the multiplication by i.
The correct code is :
void main(){
int num=10;
for(var i=1;i<=10;++i){
print('$num*$i=${num*i}');
}
}
instead of this:
void main{
int num=10;
for(var i=1;i<=10;++i){
print('$num*$i=$num');
}
}
void main()
{
int num =20;
for(int i=1;i<=10;i++)
{
print("num* $i = ${num*2}");
}
}
Related
#include<iostream>
using namespace std;
void quickSort(int input[], int start, int end)
{
// your code goes here
}
void quickSort(int input[], int size)
{
quickSort(input, 0, size - 1);
}
*/
void swap(int* a,int* b){
int temp=*a;
*a=*b;
*b=temp;
}
int count(int input[],int start,int end ){
static int c=0;
if(start==end)
return c;
if(input[start]>input[end])
c++;
return count(input,start,end-1);
}
int partionArray(int input[],int start,int end ){
int c=count(input,start,end);
int pi=c+start;
swap(&input[start],&input[pi]);
int i=start;
int j=end;
while(i<pi&&j>pi)
{
if(input[i]<input[pi])
{
i++;
}
else if(input[j]>=input[pi])
{
j--;
}
else
{
swap(&input[i],&input[j]);
i++;
j--;
}
}
return pi;
}
void qs(int input[],int start, int end){
if(start>=end)
return;
int pi=partionArray(input,start,end);
qs(input,start,pi-1);
qs(input,pi+1,end);
}
void quickSort(int input[], int size) {
qs(input,0,size-1);
}
int main(){
int n;
cin >> n;
int *input = new int[n];
for(int i = 0; i < n; i++) {
cin >> input[i];
}
quickSort(input, n);
for(int i = 0; i < n; i++) {
cout << input[i] << " ";
}
delete [] input;
}
Sort an array A using Quick Sort. Using reccursion is the question.
Input format :
Line 1 : Integer n i.e. Array size
Line 2 : Array elements (separated by space)
Output format :
Array elements in increasing order (separated by space)
Constraints :
1 <= n <= 10^3
What did i do wrong in this code pls can any one explain?Is every thing right with this code?
How can I write a code that finds capital words in a given string in dart
for example
String name ='deryaKimlonLeo'
//output='KL'
Hmmm try this using pattern if you only want to get only the big letter then try this
String name ='deryaKimlonLeo';
print(name.replaceAll(RegExp(r'[a-z]'),""));
//Output you wanted will be
// KL
try this on dart pad it works
A basic way of doing this is like
void main() {
String name = 'deryaKimlonLeo';
String result = '';
for (int i = 0; i < name.length; i++) {
if (name.codeUnitAt(i) <= 90 && name.codeUnitAt(i) >= 65) {
result += name[i];
}
}
print(result);
}
More about ASCII and codeUnitAt.
sample code:
void main() {
String test = "SDFSDdsfdDFDS";
for (int i = 0; i < test.length; i++) {
if (test[i].compareTo('A') >= 0 && test[i].compareTo('Z') <= 0)
print(test[i]);
}
}
I've faced with the problem and been trying to solve it for almost an hour. I'm sharing this just in case anyone may face with the same problem. To explain the question and answer more clearly here is an example:
1) Let's say you create some button objects dynamically and add pile them up in a List:
private void CreateButtons(int length)
{
for (int i = 0; i < length; i++)
{
var newButton = Instantiate(buttonPrefab);
buttonList.Add(newButton);
}
}
2) Then you want to assign same function to different buttons but with different parameters:
Here is the assigned method:
private void Test(int a)
{
print(a);
}
And here is the assigning loop:
private void AssignClickEvents()
{
for (int i = 0; i < buttonList.Count; i++)
{
buttonList[i].GetComponent<Button>().onClick.AddListener(() => { Test(i); });
}
}
The problem with the above code is that when a button is clicked it won't give you 0,1,2... etc. All buttons will give you the same value which is last assigned value of loop parameter 'i'. Check answer for solution:
I don't know the exact reason behind this but to get things work you need to use a local variable for function parameter. Here is the code:
private void AssignClickEvents()
{
for (int i = 0; i < buttonList.Count; i++)
{
int a = i;
buttonList[i].GetComponent<Button>().onClick.AddListener(() => { Test(a); });
}
}
I hope it helps!
I'm creating two classes called stop watch and random numbers, which I have already done, but I needed to create a test program that would measure the execution time of sorting 100,000 numbers using selection sort. I know how to create a selection sort, I just don't know how to take the random numbers class and put it together with the selection sort, I get the error message "incompatible types random numbers cannot be converted to int" I hope someone can help me.
My random numbers class
import java.util.Random;
public class randomnumbers {
Random ran1 = new Random();
private int size;
public randomnumbers(){
size = 100000;
}
public int getSize(){
return size;
}
public void setSize(int newSize){
size = newSize;
}
public int [] createArray(int [] size){
for (int i = 0; i < size.length; i++){
size[i] = ran1.nextInt();
}
return size;
}
public static void printArray (int [] array){
for (int i = 0; i < array.length; i++){
if (i < 0){
System.out.println(array[i] + " ");
}
}
}
}
My test Program
public static void main (String [] args){
// Create a StopWatch object
StopWatch timer = new StopWatch();
//create random numbers
randomnumbers numbers = new randomnumbers();
//Create the size of the array
numbers.getSize();
// Invoke the start method in StopWatch class
timer.start();
//sort random numbers
selectionSort();
// Invoke the stop method in StopWatch class
timer.stop();
// Display the execution time
System.out.println("The execution time for sorting 100,000 " +
"numbers using selection sort: " + timer.getElapsedTime() +
" milliseconds");
}
// selectionSort performs a selection sort on an array
public static void selectionSort(int[] array) {
for (int i = 0; i < array.length - 1; i++) {
int min = array[i];
int minIndex = i;
for (int j = i + 1; j < array.length; j++) {
if (array[j] < min) {
min = array[j];
minIndex = j;
}
}
if (i != minIndex) {
array[minIndex] = array[i];
array[i] = min;
}
}
}
}
Where exactly are you getting "incompatible types random numbers cannot be converted to int" error?
There are multiple issues with the code:
Unconventional naming
size field is in randomnumbers class is used as actual array size in constructor but in createArray it's overshadowed with a parameter of the same name but different type and meaning.
You are not passing any array to selectionSort in Main. This is where I get compile error on your code.
printArray has if (i < 0) condition that is false for all ran1.nextInt() numbers so it will not print anything.
Feeding selectionSort with numbers.createArray(new int[numbers.getSize()]) compiles and ends up sorting the array.
I am coding a Fibonacci sequence in Eclipse and this is my code-
public class FibonacciAlgorithm {
private int a = 0;
private int b = 1;
public FibonacciAlgorithm() {
}
public int increment() {
int temp = b;
b = a + b;
a = temp;
return value;
}
public int getValue() {
return b;
}
}
It is showing an error in the return value; line saying value cannot be resolved to a variable. I don't see any other errors.
Where is value defined? You return something that was not defined anywhere.
You don't have a "value" defined, this is your error. I don't remember the thing exactly, but I think you don't need a and b, I found this in my code archive, hope it helps.
public class Fibonacci
{
public static long fibo(int n)
{
if (n <= 1) return n;
else return fibo(n - 1) + fibo(n - 2);
}
public static void main() {
int count = 5; // change accordingly, bind to input etc.
int N = Integer.parseInt(count);
for (int i = 1; i <= N; i++)
System.out.println(i + ": " + fibo(i));
}
}
In case you want to stay with your own code, try returning "b" as value.
Your method is returning an int variable so you would have to define and return value as an int
I am not sure what you trying to do.
If you have "getValue" method I think "increment" method should be void.
When you want current Fibonacci value use "getValue" method.
public class FibonacciAlgorithm {
private int a = 0;
private int b = 1;
public FibonacciAlgorithm() {
}
public void increment() {
int temp = b;
b = a + b;
a = temp;
}
public int getValue() {
return b;
}