parseint

How to round off parseFloat results in Jquery/Javascript?

生来就可爱ヽ(ⅴ<●) 提交于 2019-12-08 16:06:15
问题 How would I round off a value from a textfield with a parseFloat result in it? This application basically sums up the value of all radio buttons when clicked and displays the sum in a textbox. The code below works perfectly if the radio button value is an integer, however if I want to have a floating point value on the radio button, the total value will have a 100.0000000679 when it should be 100 . Any tips would be very much appreciated. Thanks in advance. function calcscore(){ var score = 0

java.lang.NumberFormatException: For input string: “23 ” [duplicate]

谁都会走 提交于 2019-12-07 13:45:05
问题 This question already has answers here : What is a NumberFormatException and how can I fix it? [duplicate] (9 answers) Closed 3 years ago . I gave 23 (looks like a proper string) as input, but stil get NumberFormatException. Please point out where I went wrong. PS I was trying to solve "chef and strings problem" on codechef Relevent code: Scanner cin=new Scanner(System.in); cin.useDelimiter("\n"); String data=cin.next(); System.out.println(data); /* * @param Q no. of chef's requests */ String

将字符串转换为整数?

两盒软妹~` 提交于 2019-12-07 12:02:25
如何在JavaScript中将字符串转换为整数? #1楼 尝试parseInt。 var number = parseInt("10", 10); //number will have value of 10. #2楼 尝试parseInt函数: var number = parseInt("10"); 但有一个问题。 如果尝试使用parseInt函数转换“ 010”,它将检测为八进制数字,并返回数字8。因此,您需要指定一个基数(从2到36)。 在这种情况下,以10为底。 parseInt(string, radix) 例: var result = parseInt("010", 10) == 10; // Returns true var result = parseInt("010") == 10; // Returns false 请注意, parseInt 在解析任何有效内容后会忽略错误数据。 该GUID将解析为51: var result = parseInt('51e3daf6-b521-446a-9f5b-a1bb4d8bac36', 10) == 51; // Returns true #3楼 最简单的方法是使用本机 Number 函数: var x = Number("1000") 如果这对您不起作用,则有 parseInt , 一元plus ,

将字符串转换为整数?

北战南征 提交于 2019-12-07 11:56:44
如何在JavaScript中将字符串转换为整数? #1楼 尝试parseInt。 var number = parseInt("10", 10); //number will have value of 10. #2楼 尝试parseInt函数: var number = parseInt("10"); 但有一个问题。 如果尝试使用parseInt函数转换“ 010”,它将检测为八进制数字,并返回数字8。因此,您需要指定一个基数(从2到36)。 在这种情况下,以10为底。 parseInt(string, radix) 例: var result = parseInt("010", 10) == 10; // Returns true var result = parseInt("010") == 10; // Returns false 请注意, parseInt 在解析任何有效内容后会忽略错误数据。 该GUID将解析为51: var result = parseInt('51e3daf6-b521-446a-9f5b-a1bb4d8bac36', 10) == 51; // Returns true #3楼 最简单的方法是使用本机 Number 函数: var x = Number("1000") 如果这对您不起作用,则有 parseInt , 一元plus ,

How can I parse String to int with the default value? [duplicate]

≡放荡痞女 提交于 2019-12-07 07:43:08
问题 This question already has answers here : Good way to encapsulate Integer.parseInt() (23 answers) Closed 2 years ago . I need to parse a string user id into integer for that I used Integer.parseInt(String s) but it returns null/nil, if there string has/holds non-decimal/integer value and in that case, I need to assign default integer value as 0 . I tried this but it (? 0) seems not working and I don't know whether it is correct syntax or not. String userid = "user001"; int int_userid = Integer

将字符串转换为整数?

廉价感情. 提交于 2019-12-06 20:21:24
如何在JavaScript中将字符串转换为整数? #1楼 尝试parseInt。 var number = parseInt("10", 10); //number will have value of 10. #2楼 尝试parseInt函数: var number = parseInt("10"); 但有一个问题。 如果尝试使用parseInt函数转换“ 010”,它将检测为八进制数字,并返回数字8。因此,您需要指定一个基数(从2到36)。 在这种情况下,以10为底。 parseInt(string, radix) 例: var result = parseInt("010", 10) == 10; // Returns true var result = parseInt("010") == 10; // Returns false 请注意, parseInt 在解析任何有效内容后会忽略错误数据。 该GUID将解析为51: var result = parseInt('51e3daf6-b521-446a-9f5b-a1bb4d8bac36', 10) == 51; // Returns true #3楼 最简单的方法是使用本机 Number 函数: var x = Number("1000") 如果这对您不起作用,则有 parseInt , 一元plus ,

【面试题】['1', '2', '3'].map(parseInt)输出结果?

你。 提交于 2019-12-06 12:38:36
https://segmentfault.com/a/1190000020760308 array.map(function(currentValue,index,arr), thisValue) parseInt(string, radix) 表示要解析的数字的基数。该值介于 2 ~ 36 之间。 如果省略该参数或其值为 0,则数字将以 10 为基础来解析。如果它以 “0x” 或 “0X” 开头,将以 16 为基数。 如果该参数小于 2 或者大于 36,则 parseInt() 将返回 NaN。`在我们这道题中,很明显,它的返回值实际上就是: [ parseInt('1', 0), parseInt('2', 1), parseInt('3', 2) ] 从它的定义来看,由于第一个传入的第二个参数是0,所以它以10为基础来解析,所以返回数字 1 本身第二个传入的第二个参数是1,小于2,所以返回的NaN第三个传入的第二个参数是2,由于我们的二进制只有0、1,所以当我们传入字符串3时无法识别,所以还是返回的NaN 来源: https://www.cnblogs.com/dhjy123/p/11984349.html

parseInt changes the integer

帅比萌擦擦* 提交于 2019-12-06 10:39:00
I am trying to pull a number (721576481415319 78 ), which starts at the 21st character, out of the title of a page like so: parseInt(document.title.substring(21), 10); This returns the string as an integer of 721576481415319 80 . I can't seem to figure out why it is changing the last two numbers. Any help would be appreciated. Guy Lowe According to What is JavaScript's highest integer value that a Number can go to without losing precision? the max value of an integer is 9007199254740992. I tried your calculation on http://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_parseint and I can

java.lang.NumberFormatException: For input string: “23 ” [duplicate]

倖福魔咒の 提交于 2019-12-05 22:11:50
This question already has answers here : What is a NumberFormatException and how can I fix it? [duplicate] (9 answers) Closed 3 years ago . I gave 23 (looks like a proper string) as input, but stil get NumberFormatException. Please point out where I went wrong. PS I was trying to solve "chef and strings problem" on codechef Relevent code: Scanner cin=new Scanner(System.in); cin.useDelimiter("\n"); String data=cin.next(); System.out.println(data); /* * @param Q no. of chef's requests */ String tempStr=cin.next(); System.out.println(tempStr);; int Q = Integer.parseInt(tempStr); Output: sdfgsdg

js的类型转换

余生颓废 提交于 2019-12-05 20:20:54
js常见的类型转换有3种, 1. 转为string类型 2.转为boolean类型 3.转为number类型 这三种转换也是隐式转换中的所有转换类型 toString()转换为字符串 原始值转化为字符串 (2).toString() //”2″ (true).toString() //”true” (false).toString() //”false” (null).toString() //报错,没有toString这个属性 (undefined).toString() //报错,没有toString这个属性 引用值 转化为字符串 对象变成[object Object] ({}).toString() //”[object Object]” ({name:”lion”}).toString() //”[object Object]” function对象变成字符串的function (function(){}).toSring() //”function(){}” (function(){console.log(123)}).toString() //”function(){console.log(123)}” 将数组转换为字符串 (“[ 1,2,3 ]”).toString() //’1,2,3′ (“”).toString() //” ([1,[1,2],[1,2,3]])