Java – checking if parseInt throws exception
public static boolean isParsable(String input) { try { Integer.parseInt(input); return true; } catch (final NumberFormatException e) { return false; } }
parseint
Why does parseInt(1/0, 19) return 18?
The result of 1/0 is Infinity. parseInt treats its first argument as a string which means first of all Infinity.toString() is called, producing the string “Infinity”. So it works the same as if you asked it to convert “Infinity” in base 19 to decimal. Here are the digits in base 19 along with their decimal … Read more
Remove leading zeros from a number in Javascript [duplicate]
We can use four methods for this conversion parseInt with radix 10 Number Constructor Unary Plus Operator Using mathematical functions (subtraction) const numString = “065”; //parseInt with radix=10 let number = parseInt(numString, 10); console.log(number); // Number constructor number = Number(numString); console.log(number); // unary plus operator number = +numString; console.log(number); // conversion using mathematical function (subtraction) … Read more
Parsing a Hexadecimal String to an Integer throws a NumberFormatException?
Will this help? Integer.parseInt(“00ff00”, 16) 16 means that you should interpret the string as 16-based (hexadecimal). By using 2 you can parse binary number, 8 stands for octal. 10 is default and parses decimal numbers. In your case Integer.parseInt(primary.getFullHex(), 16) won’t work due to 0x prefix prepended by getFullHex() – get rid of and you’ll … Read more
Is NaN equal to NaN?
Update 2 New to ECMAScript 6 is the Object.is() function. This is designed to be a further enhancement of the === check. One of the benefits of this new function is that Object.is(NaN, NaN) will now return true. If you’re able to utilize ECMAScript 6, then this would be the most readable and consistent solution … Read more
How to parseInt a string with leading 0
include the radix: parseInt(“09”, 10);
Why am I getting weird result using parseInt in node.js? (different result from chrome js console)
Undefined behavior occurs when the string being passed to parseInt has a leading 0, and you leave off the radix parameter. An integer that represents the radix of the above mentioned string. Always specify this parameter to eliminate reader confusion and to guarantee predictable behavior. Different implementations produce different results when a radix is not … Read more
Different between parseInt() and valueOf() in java?
Well, the API for Integer.valueOf(String) does indeed say that the String is interpreted exactly as if it were given to Integer.parseInt(String). However, valueOf(String) returns a new Integer() object whereas parseInt(String) returns a primitive int. If you want to enjoy the potential caching benefits of Integer.valueOf(int), you could also use this eyesore: Integer k = Integer.valueOf(Integer.parseInt(“123”)) … Read more
Why is JSON invalid if an integer begins with a leading zero?
A leading 0 indicates an octal number in JavaScript. An octal number cannot contain an 8; therefore, that number is invalid. Moreover, JSON doesn’t (officially) support octal numbers, so formally the JSON is invalid, even if the number would not contain an 8. Some parsers do support it though, which may lead to some confusion. … Read more
Java: parse int value from a char
Try Character.getNumericValue(char). String element = “el5”; int x = Character.getNumericValue(element.charAt(2)); System.out.println(“x=” + x); produces: x=5 The nice thing about getNumericValue(char) is that it also works with strings like “el٥” and “el५” where ٥ and ५ are the digits 5 in Eastern Arabic and Hindi/Sanskrit respectively.