Im still starting out in java - and any guidance would be great on this. I'm basically hoping to create an array, then assign values to that array in a for loop. The code I have at the moment is:
int i;
int[] testarray = new int[50];
for (i = 0; i <=50; i++) {
testarray[i]=i;
}
All i wanna do is make an array with each entry the number of the iteration (using this method) I know its really simple, but I feel as if I have missed something important during learning the basics! Thanks!
Everything is fine except the stop condition:
for (i = 0; i < 50; i++) {
Since your array is of size 50, and indices start at 0, the last index is 49.
You should reduce the scope of i, avoid hard-coding the length everywhere (don't repeat yourself principle), and respect the camelCase naming conventions:
int[] testArray = new int[50];
for (int i = 0; i < testArray.length; i++) {
testArray[i]=i;
}
Your array has 50 elements, and your loop goes over 51 elements (0 to 50).
Just change the code to:
int[] testarray = new int[50];
for (int i = 0; i < 50; i++) {
testarray[i] = i;
}
or better:
int[] testarray = new int[50];
for (int i = 0; i < testarray.length; i++) {
testarray[i] = i;
}
Use length of the array instead of hard-coding 50.
for (i = 0; i <testarray.length; i++)
//Create a function that takes two numbers as arguments (num, length) and returns
// an array of multiples of num until the array length reaches length.
package ArrayPractice;
public class Question1 {
//Creating array method
public int[] arrayofMultiples(int number, int demo) {
int[] testing = new int[demo];
int y = 1;
int z = number;
for (int i = 0; i < testing.length; i++) {
number = z * y;
testing[i] = number;
y++;
}
return testing;
}
public static void main(String[] args) {
Question1 question1 = new Question1();
// Creating an array to get the get values of array method
int[] t1 = question1.arrayofMultiples(17, 6);
for (int i : t1) {
System.out.println(i);
}
}
}
Program to input elements in an array in java using for loop
import java.util.*;
public class Main{
public static void main(String[]args){
Scanner a=new Scanner(System.in);
// code starts here
int length;
length=a.nextInt();
int [] arr = new int[length];
for(int i=0;i<length;i++){
arr[i]=a.nextInt();
}
for(int i=0;i<length;i++){
System.out.println(arr[i]);
}
}
}
