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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.

While infinite (Restriction) loop is not working properly [closed]

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as one of my first java projects, I want to build a mortgage calc.
I was trying to restrict the duration that the user can pick using this code
Scanner numOfPayments = new Scanner(System.in);
while (true) {
System.out.print("Enter number of payments (the number of Years you will be paying the loan):");
short numOfPayments2 = numOfPayments.nextShort();
if (numOfPayments2 >= 1 && numOfPayments3 <= 30) {
numOfPayments3 = (short) (numOfPayments2 * 12);
break;
}
System.out.println("Enter a valid number of years(Between 1 and 30)");
}
It worked with restricting other values, but not for this one.
Thanks in advance

Thanks for #azro for the answer
I should just change numOfPayments3 to numOfPayments2 inside the If statement

String is unable to print when I use charAt() [closed]

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Closed 3 years ago.
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I want to find the palindrome of a string.
public static void main(String[] args)
{
String s1 = "eye",s2="";
for(int i = s1.length()-1;i<=0;--i)
{
s2 =s2+String.valueOf(s1.charAt(i));
}
System.out.println(s1);
System.out.println(s2);
}
}
I expected the output
eye
eye
but, s2 isn't printing.

You have the wrong condition in the for loop. The correct condition should be i>=0.
Remember that as long as this condition is true, the for loop will run. Your original condition, i<=0 is false at the very beginning, when i is 2, so the for loop never starts.
A less important problem is that you should not concatenate strings in a for loop, and should use a StringBuilder instead. See this.

Variable declaration not allowed. But there is no scope overlap [closed]

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Closed 6 years ago.
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When I fill an array of characters I get an error.
List<Character> letters = new ArrayList<>();
int i = 0;
if (i == 0) {
Character str = 'a';
letters.add(str);
} else if (i == 1)
Character str = 'b'; //Variable declaration not allowed here
letters.add(str);
}
Why does this error message appear? Cases i==0 and i==1 are mutually
exclusive. Why compiler doesn't allow me to decare str the second time?

Scope in not overlapping, this is correct. You are forgetting an opening curly bracket at else if line. This is just a typo that looks like
} else if (i == 1){ fixes a problem.
Your situation is distinctly different from JAVA Variable declaration not allowed here

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 ;-)