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recently my teacher showed us how to make a summ methode but i cant remember it.I think i got it a bit ritght.But it tells me error unexpected token a
void main(){
summ(6, 7);
}
int summ(a, b){
a = int
b = int
return a+b }
It should be like this
static int summ(int a, int b)
{
return a+b;
}
Related
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I'm making a quick hangman game, and came across an IndexOutOfBoundsException and was wondering why. I don't see the problem/how this error would come about.
It happens at this line:
array[index]+=c;
Any feedback is appreciated.
import java.io.IOException;
import java.util.Scanner;
public class Driver {
public static void main(String[]args) throws IOException {
Scanner console = new Scanner (System.in);
String[] phrase={"television"};
String[] array= new String[phrase.length];
int body =6;
while(array!=phrase) {
char c=(char)System.in.read();
int index= console.nextInt();
array[index]+=c;
if(array[index].charAt(index)==phrase[index].charAt(index)){
System.out.println("the new array");
}
}
}
}
There are many Issues with the code. few of them are below.
you are creating array of size "phrase.length" which will be of size 1, when i enter 2 for "console.nextInt();" it will throw index out of bound.
Array Equality check is wrong, you need to do something like
if( Arrays.equals(array1, array2) )
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I'm new and would like to find and correct my errors. I got 2 errors while writing a java program to print prime nos. between 1 to 20.
code:
error:
; instead of ,
for (i=1;i<20;i++)
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I'm having an issue with multiple NullPointerExceptions, I'm getting one for my if statements within iterators and I can't figure out why
one of the problem blocks:
public int removeAllBooks(String author, String title){
Iterator<Book> itr=library.iterator();
int i=0;
while(itr.hasNext()){
Book book=itr.next();
if(b.getAuthor().equals(author)&&(b.getTitle().equals(title))){
itr.remove();
i++;
}
if(i>0){
return i;
}
}
return 0;
}
The NPE error points to my if-statement line for some reason.
Thanks.
What is b? Where is it declared/initialized? Your itr.next() is assigned to the book variable, not b.
You code should probably be :
Book book=itr.next();
if(book.getAuthor().equals(author)&&(book.getTitle().equals(title))){
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am writing a java program as below.
Void fun(int n){
for(int i=0;i<=n;i++){
fun(n-i);
}
System.out.println(“well done”);
}
I am getting error, missing return statement. I not used int or string method. It is void method na. why it asking return type, please help for this problem.
Void is a reference type.
void is a language primitive.
You don't need a return statement when your return type is void.
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Can you please help me make the following code work?
for(int a=0, b=0; a<101; b<102; a++; b++;) {
stuff
}
You got the initialization (first) part of the loop right.
The termination or condition (second) part of the loop should be evaluated to a boolean, so assuming you require an AND relation between the conditions on a and b, it becomes a<101 && b<102. You might want || (OR) instead, depending on your logic.
The increment (third) part of the loop should contain comma separated expressions (same as the initialization part which you already got right).
I also removed an extra ';' from the end.
for(int a=0, b=0; a<101 && b<102; a++, b++) { stuff }