addition

问题 Edit: I have reformatted the post to be clearer. Why does this work: struct A {}; struct B { B(A){} }; void operator+(const B&, const B&) {} int main() { A a1, a2; a1 + a2; } and this does not? struct B { B(const char*){} }; void operator+(const B&, const B&) {} //error: invalid operands of types 'const char [6]' and 'const char [6]' to binary 'operator+'| int main() { "Hello" + "world"; } Essentially, in the first example a1 and a2 both convert to B objects through the implicit conversion

问题 I'm a novice Assembly x86 Learner, and i want to add two numbers (5+5) and print the result on the screen. here is my code: global _start section .text _start: mov eax, 5 mov ebx, 5 add eax, ebx push eax mov eax, 4 ; call the write syscall mov ebx, 1 ; STDOUT pop ecx ; Result mov edx, 0x1 int 0x80 ; Exit mov eax, 0x1 xor ebx, ebx int 0x80 Correct me please 回答1: Another approach to convert an unsigned integer to a string and write it: section .text global _start _start: mov eax, 1234567890 mov

问题 This question already has answers here : Difference between a+b and a.__add__(b) (1 answer) Python: __add__ and +, different behavior with float and integer (1 answer) Closed 16 days ago . I was expecting __add__ to work, but that's obviously not the case (in Python 3.8.0 at least): >>> 10 .__add__(5.5) NotImplemented >>> 10 .__radd__(5.5) NotImplemented The other way around works: >>> 5.5 .__add__(10) 15.5 >>> 5.5 .__radd__(10) 15.5 Why doesn't the first code work? Is there a good reason

问题 I'm looking for a routine, which help me to do any of operation on floating point numbers (it can be addition), but without using Floating Point Unit (FPU). I have to make a program, which compares time of doing operation without FPU and with FPU. Second part, with using FPU is done, but I can't find any good routine. 回答1: Not sure why people are all shocked about the complexity. Addition, subtraction and multiplication are not terribly difficult. You will need to split the numbers into sign,

问题 Ok so my requirement is fairly simple. I have a table like so. images | videos | reviews -------------------------------------------------- 0 | 2 | 1 4 | 5 | 0 11 | 1 | 4 0 | 1 | 7 I need to write a query that counts the rows in each column that is not equal to 0 , and also that gives the actual sum of the numbers in the columns. So the result will look something like this. Columns | Counts | Sum ---------------------------------------------------- images | 2 | 15 videos | 4 | 9 reviews | 3 |

问题 I have three dates as String objects in the format: dd:HH:mm:ss 00:1:9:14 00:3:10:4 00:3:39:49 How do I add these dates in Java to get the sum ( 00:7:59:07 )? Sample code: SimpleDateFormat sdf = new SimpleDateFormat("dd:HH:mm:ss"); Date d1 = sdf.parse("00:1:9:14"); Date d2 = sdf.parse("00:3:10:4"); Date d3 = sdf.parse("00:3:39:49"); System.out.println(d1); System.out.println(d2); System.out.println(d3); Date d = new Date(d1.getTime() + d2.getTime() + d3.getTime()); System.out.println(d);

问题 I need to create a method in C using bitwise operations which checks if x + y will overflow or not. I can only use a maximum of 20 of the following operations; ! ~ & ^ | + << >> Keep in mind I have to test for both negative and positive numbers. I've tried several times to make it work. Is my logic sound? I'm going by: if (x + y) is less than x, then it has overflowed. Based on that logic, I wrote this; int addOK(int x, int y) { int sum = x + y; int nx = ((~x) + 1); int check = (sum + nx)>>31

问题 I'm designing a data submission spreadsheet with 12 rows of data (currently row 22 to 33). Rows 34 to 42 are filled with text. I'd like to add a new row (row 34) below row 33 if more than 12 data sets are to be entered, with the same format as row 33, using a macro assigned to a button. That's easy, but if I need another new row (now row 35) below row 34, I need a code is flexible to do that; mine always adds the new line below row 33, not below the last row of the data entry set. How do I do

问题 I'm designing a data submission spreadsheet with 12 rows of data (currently row 22 to 33). Rows 34 to 42 are filled with text. I'd like to add a new row (row 34) below row 33 if more than 12 data sets are to be entered, with the same format as row 33, using a macro assigned to a button. That's easy, but if I need another new row (now row 35) below row 34, I need a code is flexible to do that; mine always adds the new line below row 33, not below the last row of the data entry set. How do I do

问题 I encountered this problem while trying to add the values of 6 different input, I noticed that if I add 3 of them it works, but if I add more than 3 values it doesn't work. When I add 3 values between them, everything seems to work correctly but, for example, if I add 4 values, the result is like the addition between a string and a number. May I have your help please? This is my HTML code for the imput tags: document.getElementById("b").onclick = function() { var x = document.getElementById(