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why this function is not working in Kotlin [closed]

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I'm trying to make a function that removes all spaces in the given string. This is my code:
fun nonSpaceString(s: String): String {
var result = " "
for (index in 0..s.length-1) {
if (s[index] != ' ') {
result += s[index]
}
}
return result
}
fun main(){
nonSpaceString("abc d e")
}
But the result is holding "a" and then holding "ab" but the end result holds nothing. Does anyone know what I'm doing wrong here?

You have initialized the result with a space character. So the result starts with a space that may confuse you. Apart from that, your function is working fine.
Additionally, you can use the replace function to remove all spaces from a string
"abc d e".replace("\\s+".toRegex(), "")

Why am I not getting Output? Can anyone help me? [closed]

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I have declared a variable of type long and I want to print the statements if the given variable lies between the range specified -
class Sample {
public static void main(String[] args) {
long n = 3454546L;
if (-2147483648L<=n && n>=2147483647L) {
System.out.println("* int");
System.out.println("* long");
}
}
}
This is the code.

Because your logic is is n >= -2147483648L true and n >= 2147483647L false so overall false?
Think you wanted
-2147483648L<= n && n<=2147483647L

Your second part being n>=2147483647L is not matching, thus you have false and will not go into the statements, i guess it should be n<=2147483647L?

I want my loop to end at the given number in java [closed]

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I want to key in a value(int) as a parameter and make a loop from zero until it reaches that number.
Scanner s = new Scanner(System.in);
int m=0;
int a;
a=s.nextInt();
while(a<=10) {
System.out.println(m); m++;
}

while loop must be like this:
while(m<=a) {
...
}

In while condition you need to add m<=10 not a.

reading char by char from a stringbuilder [closed]

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I'm writing a little application that receives instructions in a StringBuilder filled with "(" and ")", for every ( the application sums 1, for every ( it decreases 1. I know it's a bit weird but it's a puzzle and it had to be done like that.
I'm having problems reading the content from the stringbuilder, Eclipse is complaining that it cannot access the specified index with charAt, what am I doing wrong?
I already checked and StringBuilder instructions is valid and properly filled with ( and ), no nulls or other symbols.
public void walker(StringBuilder instructions){
for(int i=0; i<instructions.length();i++){
if(instructions.charAt(0)==")"){
//do something
}
else(){
//do other thing
}
}

To use a Char in Java you use ' not "
so it should be :
public void walker(StringBuilder instructions){
for(int i=0; i<instructions.length();i++){
if(instructions.charAt(0)==')'){ //<-- note the change of " to '
//do something
}
else{
//do other thing
}
}
}
Edit 1:
The above solves the complication problem however
as #cricket noted, it should be charAt(i) for correctness of the code

I am getting a "not a statement" error on a for each loop [closed]

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The problem seems to be in the increment, but I need it to decrease by 2. The "length" variable is for the length of a series of numbers
public int longMethodName()
{
int length = cardNumber.length();
longMethodName = 0
for(int i=length-1; i<0; i-2)
{
int cardNumberInt = Integer.parseInt(cardNumber.charAt(i));
int tempVar = cardNumberInt*2;
longMethodName = longMethodName + tempVar;
}
return longMethodName;
}

You need to change it to i=i-2 or i-=2 to decrement by 2.
You might be trying to emulate the i++/i-- syntax, which is simply shorthand for i = i+1 or i=i-1. However, that syntax only works for change by 1 (formally speaking ++ and -- are unary operators ), so i-2 won't work directly.
You also need to fix the other errors, as detailed in the other answer.

1.) longMethodName = 0 // Semicolon missing
2.) i-2, need to change to i = i-2
3.) Integer.parseInt(), cardNumber.charAt(i)returns char which is not allowed

You can also use i-=2 so you don't have to write i a second time ;-)