math

问题 I'm just starting out in C++ (literally my second day) and I've been assigned to calculate the ranges of the varying data types, signed and unsigned. The problem is, the way my school works I won't get to the Math portion where he teaches us the formula for another couple months. He said to get the information from someone who has done the math course already however all of them said they're going to work on this from home where they have their notes. So now I'm left in the dark with google

问题 I'm just starting out in C++ (literally my second day) and I've been assigned to calculate the ranges of the varying data types, signed and unsigned. The problem is, the way my school works I won't get to the Math portion where he teaches us the formula for another couple months. He said to get the information from someone who has done the math course already however all of them said they're going to work on this from home where they have their notes. So now I'm left in the dark with google

问题 I have a multidimensional associative array with a type property. It looks like this: $data = array( array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "B"), array( "name" => "SomeName", "type" => "B"), array( "name" => "SomeName", "type" => "B"), array( "name" => "SomeName", "type"

问题 I have a multidimensional associative array with a type property. It looks like this: $data = array( array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "A"), array( "name" => "SomeName", "type" => "B"), array( "name" => "SomeName", "type" => "B"), array( "name" => "SomeName", "type" => "B"), array( "name" => "SomeName", "type"

问题 So I have some code which basically reads: int foo = bar * (percentage / 100); Where foo represents the percentage of bar. So, if bar was 100 and percentage was 20, we would expect 20/100 = 0.2 so 100 * 0.2 = 20... but that's not what happens. Every time, without fail foo = 0. I figured 'maybe it's not a whole number' so I tried: float foo = bar * (percentage / 100); foo still = 0. Any help would be appreciated, as I've never been great at math, but I'm pretty sure I'm not wrong on this bit

问题 So I have some code which basically reads: int foo = bar * (percentage / 100); Where foo represents the percentage of bar. So, if bar was 100 and percentage was 20, we would expect 20/100 = 0.2 so 100 * 0.2 = 20... but that's not what happens. Every time, without fail foo = 0. I figured 'maybe it's not a whole number' so I tried: float foo = bar * (percentage / 100); foo still = 0. Any help would be appreciated, as I've never been great at math, but I'm pretty sure I'm not wrong on this bit

问题 This question already has answers here : Dynamically arrange some elements around a circle (5 answers) Rotate objects around circle using CSS? (5 answers) Closed 5 months ago . I have a container element with 3 children, all with border-radius set to make them circles. Approx: <div id="rotator"> <div id="a">a</div> <div id="b">b</div> <div id="c">c</div> </div> #rotator { position: relative } #rotator div { position: absolute; border-radius: 50%; } #rotator div#a { top: -20%; left: 30%; }

问题 I am wondering if there is a general formula of some sort that can take a single incrementing integer, and run it through a modulus sort of thing to shift it to a random place, so as you increment the counter, its output value jumps around and appears random, yet no value is ever hit twice. Assuming some limit on the set of numbers like 16-bit integers (65536 integers), or 32-bit integers, etc.. Perhaps there is a way to spiral numbers down somehow, I don't know. The sequence would be

问题 I'm using two different variable to divide in the calculation with the variable from int and double . These work fine when I use something like: int cost cost = 40; cost = (cost / 400) * 20 * 2; For this the method works fine and I get the right result which is 4 , but when I use the variable cost and put it in the header instead, like: #define cost 40 int total_cost; total_cost = (cost / 400) * 20 * 2; this always results in 0 for me and I don't know why. Even if I use printf with %d or %f

问题 I'm using two different variable to divide in the calculation with the variable from int and double . These work fine when I use something like: int cost cost = 40; cost = (cost / 400) * 20 * 2; For this the method works fine and I get the right result which is 4 , but when I use the variable cost and put it in the header instead, like: #define cost 40 int total_cost; total_cost = (cost / 400) * 20 * 2; this always results in 0 for me and I don't know why. Even if I use printf with %d or %f