addition

Addition is not working in JavaScript

由 寵の児 提交于 2019-11-26 10:35:55
I am trying to learn Javascript. Here I am confused with the following code. http://rendera.heroku.com/usercode/eae2b0f40cf503b36ee346f5c511b0e29fc82f9e When I put x+y in the function it is going wrong. For example 2+2=22 , 5+7=57 But / , * , - are working. Why is + not working? Please help me. Thanks a lot in advance One or both of the variables is a string instead of a number. This makes the + do string concatenation. '2' + 2 === '22'; // true 2 + 2 === 4; // true The other arithmetic operators / * - will perform a toNumber conversion on the string(s). '3' * '5' === 15; // true A quick way

What's the difference between array_merge and array + array?

由 邮差的信 提交于 2019-11-26 10:28:47
问题 A fairly simple question. What\'s the difference between: $merged = array_merge($array1, $array2); and $merged = $array1 + $array2; ? 回答1: The difference is: The + operator takes the union of the two arrays, whereas the array_merge function takes the union BUT the duplicate keys are overwritten). 回答2: Here's a simple illustrative test: $ar1 = [ 0 => '1-0', 'a' => '1-a', 'b' => '1-b' ]; $ar2 = [ 0 => '2-0', 1 => '2-1', 'b' => '2-b', 'c' => '2-c' ]; print_r($ar1+$ar2); print_r(array_merge($ar1,

What is the best way to add two numbers without using the + operator?

由 六眼飞鱼酱① 提交于 2019-11-26 09:01:35
问题 A friend and I are going back and forth with brain-teasers and I have no idea how to solve this one. My assumption is that it\'s possible with some bitwise operators, but not sure. 回答1: In C, with bitwise operators: #include<stdio.h> int add(int x, int y) { int a, b; do { a = x & y; b = x ^ y; x = a << 1; y = b; } while (a); return b; } int main( void ){ printf( "2 + 3 = %d", add(2,3)); return 0; } XOR ( x ^ y ) is addition without carry. (x & y) is the carry-out from each bit. (x & y) << 1

Concatenation with addition in it doesn&#39;t work as expected

由 房东的猫 提交于 2019-11-26 08:38:23
问题 Here is my PHP code with SQL query, but the output isn\'t as expected: $sql = \'INSERT INTO `event_footers` (`event_id`, `order`, `file_id`, `url`) VALUES \'; foreach($all_footers as $key => $val){ $sql .= \'(\'.(int)$data[\'event_id\'].\', \'.$key + 1 .\', \'.(int)$val[\'file_id\'].\', \"\'.addslashes($val[\'url\']).\'\"), \'; } $sql = rtrim($sql, \', \'); var_dump($sql); exit; AND I get sql query like this: `INSERT INTO `event_footers` (`event_id`, `order`, `file_id`, `url`) VALUES 1, 2135,

Adjust Single Value within Tensor — TensorFlow

由 北城以北 提交于 2019-11-26 06:35:29
问题 I feel embarrassed asking this, but how do you adjust a single value within a tensor? Suppose you want to add \'1\' to only one value within your tensor? Doing it by indexing doesn\'t work: TypeError: \'Tensor\' object does not support item assignment One approach would be to build an identically shaped tensor of 0\'s. And then adjusting a 1 at the position you want. Then you would add the two tensors together. Again this runs into the same problem as before. I\'ve read through the API docs

How to add an integer to each element in a list?

由 喜你入骨 提交于 2019-11-26 06:29:36
问题 If I have list=[1,2,3] and I want to add 1 to each element to get the output [2,3,4] , how would I do that? I assume I would use a for loop but not sure exactly how. 回答1: new_list = [x+1 for x in my_list] 回答2: >>> mylist = [1,2,3] >>> [x+1 for x in mylist] [2, 3, 4] >>> list-comprehensions python. 回答3: The other answers on list comprehension are probably the best bet for simple addition, but if you have a more complex function that you needed to apply to all the elements then map may be a

How to force addition instead of concatenation in javascript [duplicate]

由 别来无恙 提交于 2019-11-26 03:59:51
问题 This question already has an answer here: How to force JS to do math instead of putting two strings together 9 answers I\'m trying to add all of the calorie contents in my javascript like this: $(function() { var data = []; $( \"#draggable1\" ).draggable(); $( \"#draggable2\" ).draggable(); $( \"#draggable3\" ).draggable(); $(\"#droppable_box\").droppable({ drop: function(event, ui) { var currentId = $(ui.draggable).attr(\'id\'); var total = 0; data.push($(ui.draggable).attr(\'id\')); if

How we can add two date intervals in PHP

由 旧巷老猫 提交于 2019-11-26 02:24:56
问题 i want to add two date intervals to calculate the total duration in hours and minutes in fact i want to perform addittion as shown below: $a = new DateTime(\'14:25\'); $b = new DateTime(\'17:30\'); $interval1 = $a->diff($b); echo \"interval 1 : \" . $interval1->format(\"%H:%I\"); echo \"<br />\"; $c = new DateTime(\'08:00\'); $d = new DateTime(\'13:00\'); $interval2 = $c->diff($d); echo \"interval 2 : \" . $interval2->format(\"%H:%I\"); echo \"<br />\"; echo \"Total interval : \" . $interval1

Addition is not working in JavaScript

由 ↘锁芯ラ 提交于 2019-11-26 02:14:05
问题 I am trying to learn Javascript. Here I am confused with the following code. http://rendera.heroku.com/usercode/eae2b0f40cf503b36ee346f5c511b0e29fc82f9e When I put x+y in the function it is going wrong. For example 2+2=22 , 5+7=57 But / , * , - are working. Why is + not working? Please help me. Thanks a lot in advance 回答1: One or both of the variables is a string instead of a number. This makes the + do string concatenation. '2' + 2 === '22'; // true 2 + 2 === 4; // true The other arithmetic

In Java, is the result of the addition of two chars an int or a char?

由 感情迁移 提交于 2019-11-26 00:20:48
问题 When adding \'a\' + \'b\' it produces 195. Is the output datatype char or int ? 回答1: The result of adding Java chars, shorts, or bytes is an int : Java Language Specification on Binary Numeric Promotion: If any of the operands is of a reference type, unboxing conversion (§5.1.8) is performed. Then: If either operand is of type double, the other is converted to double. Otherwise, if either operand is of type float, the other is converted to float. Otherwise, if either operand is of type long,
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