bigint

问题 In plain untyped Javascript, it's not so hard to write a function which can operate on either numbers or bigints, depending on the arguments which are passed in: const sumOfSquares = (a,b) => a*a + b*b; sumOfSquares(3, 4); // returns 25 sumOfSquares(3n, 4n); // returns 25n sumOfSquares(3n, 4); // throws a TypeError It seems like there ought to be a way to declare this function in typescript so that the compiler will enforce that the arguments will work together. I tried const sumOfSquares =

问题 BigInt and Number conversions When working with numbers in JavaScript there are two primitive types to choose from - BigInt and Number. One could expect implicit conversion from " smaller " type to " bigger " type which isn't a case in JavaScript. Expected When computing some combination of BigInt and Number user could expect implicit cast from Number to BigInt like in below example: const number = 16n + 32; // DOESN'T WORK // Expected: Evaluates to 48n Actual behavior Expressions operating

问题 It turns out (outer a bit of thought it's more obvious but whatever) that BigInt recently introduced to javascript has a limit: My question would be - is there a constant similar to Number.MAX_SAFE_INTEGER but for BigInt? This snippet of code: let a = 2n, step = 1; try{while(true) { console.log(step); a=a**2n; step++ }} catch(e){ console.log(e)} Shows that the limit is about (step = 32) - at least in Chrome. But I wonder what it this value as per spec. 回答1: It seems like there is no maximum

问题 So what it's supposed to do is be able to take in a const char* str change it to an int then have it be converted back into a string for the output. But it is also supposed to be able to add and subtract these together. I'm passing my first two tests but something is going on with my addition, its giving me a negative number close to the answer but not the right one. Shortened it up a bit. //For testing int main() { BigInt result; BigInt num1("999"); BigInt num2("4873"); BigInt num3("-739");

问题 Here is my request: axios.get(url) .then(res => { console.log(res.data) }) The output is { value: 156144277082605255 } But should be { value: 156144277082605250 } How to deal with Big Integers in this case? I tried to use json-bigint But since I am getting response.data from axios as object - it doesn't help. 回答1: My colleague answered the question: I had to transform my response.data into string. (you may wonder - why the useless function - just to redefine default behavior, which parses

问题 Rust has 128-bit integers, these are denoted with the data type i128 (and u128 for unsigned ints): let a: i128 = 170141183460469231731687303715884105727; How does Rust make these i128 values work on a 64-bit system; e.g. how does it do arithmetic on these? Since, as far as I know, the value cannot fit in one register of a x86-64 CPU, does the compiler somehow use 2 registers for one i128 value? Or are they instead using some kind of big integer struct to represent them? 回答1: All Rust's

问题 I want to add two numbers that have 12 bytes and to store the result in a 16 bytes var. How can i do this? section .data big_num1 dd 0x11111111, 0x22222222, 0x33333333 big_num2 dd 0xffffffff, 0x22222222, 0x33333333 section .bss result_4word resd 4 I think i can add the first 4 bytes number from number 1 with the other first 4 bytes from number 2 and so on.. but i don't know how to concatenate results in in my result variable. How should i do the carry,if it's needed? Is this solution the

问题 I want to add two numbers that have 12 bytes and to store the result in a 16 bytes var. How can i do this? section .data big_num1 dd 0x11111111, 0x22222222, 0x33333333 big_num2 dd 0xffffffff, 0x22222222, 0x33333333 section .bss result_4word resd 4 I think i can add the first 4 bytes number from number 1 with the other first 4 bytes from number 2 and so on.. but i don't know how to concatenate results in in my result variable. How should i do the carry,if it's needed? Is this solution the

问题 Im trying to write a program which get two 6-digit decimal numbers and show the addition of them, but in 16 bit 8086 i defined numbers as double word and put LO in WORD 1 and HO in word 2. similar to below code but i dont have any idea to do next, can any body suggest me algorithm for next operations? Thnx x dd(?) next_no: mov cl,2 mov ch,4 two_bit: getch sub al,30h mov bl,10 mul bl mov di,ax add word ptr x+2,di dec cl jnz two_bit fourbit: getch sub al,30h mov bl,10 mul bl mov di,ax add word

问题 I have a simple request but It seems to be harder than expected. I have to parse a bigint from a JSON stream. The value is 990000000069396215 . In my code, this value is declared in TypeScript like this: id_address: bigint . But this is not working, the value is truncated, and return nothing like 9900000000693962100 How can I simply manage this bigint in my code? 回答1: I guess you need to do something like this, export interface Address { id_address: string; } Then somewhere in your code where