Can anyone offer any help please? Trying to learn C++, I'm stuck on this problem
For this assignment you will write a program to subtract large unsigned integers. Your program should prompt and read in two large unsigned integers. The two large integers should be stored arrays, one array for each integer. The integers should be stored with one digit per location in the two arrays. The first integer should be no smaller than the second. Your program should subtract the second integer from the first. The result should be stored in an array, again one digit per location in the array. Your program should then output the difference. Your program should be able to handle integers with up to 80 digits each. You should not use any concepts from object oriented programming. In particular please do not use any classes (or struct) or any class methods. The one exception is that you may use the iostream class method cin.get(). Test data: 10000000000000000000000000000000000 - 9 1111111111111111111111111111111111 - 10000010001 123456789123456789123456789 - 99999 9999999999 - 9999999999
Implement the standard subtraction algorithm you learned in middle school basically.
Nathan Murphy
at first i thought the problem was you had to read it as a long long or something and didnt know how to separate the digits but then i realized you need to accept input per character anyway and you just cant write an algorithm which is second grade math
this is worrying. i mean, if you had at least said where you were stuck i'd give you a few pointers but it sounds like you havent even tried
>The integers should be stored with one digit per location
That's retarded as fuck.
Cameron Myers
you can use modulo operator to get each digit out of each integer. is that basically all you're asking? or do you also not know how to do everything else?
Gavin White
>You should not use any concepts from object oriented programming. In >particular please do not use any classes (or struct) or any class methods. The >one exception is that you may use the iostream class method cin.get().
Then why even use C++ if you can't even use std::string?
Solution: cpp.sh/6brpe
Gabriel Sullivan
Fixed version: cpp.sh/7yeni A cleaner c++ version: cpp.sh/6gesc
Andrew Campbell
10^80 will overflow an int64_t.
Jeremiah Lee
...
Ian Murphy
>he actually struggles with 2nd grade subtraction Can't tell if you're a biofag LARPing as a dumb CS major meme or a fa/g/got who's about to drop out from freshman becausa all you can do is Lisp fizzbuzz.
Noah Lewis
CS majors really are this stupid.
Leo Green
>A cleaner c++ version: cpp.sh/6gesc
If you're going to over do it, go all the way and use classes and provide all the operations.
cpp.sh/9fw7
Ethan Cooper
I don't even understand why this string isn't converted to some integer format, operated on, and the result is converted back into a string for output. Do not write arithmetic operations for strings. Wasting cycles.
I also don't get why you are calling it an array and not a string.
Jacob Harris
>I don't even understand why this string isn't converted to some integer format
Integers are finite precision. 32/64/128bit numbers can only store 9/19/38 digits and OP's professor wants 80. The point is to implement your own simplified version of boost::multiprecision::cpp_int.
>I also don't get why you are calling it an array and not a string.
Because OP's professor doesn't want him to.
Dylan Price
>>provide all the operations >no conversion back to ints
Your class is worthless if you can't get numbers back out
>explicit operator unsigned long long() const{ >>unsigned long long n=0; >>for(const auto& digit : num){ >>>n*=10; >>>n+=char_to_num(digit); >>} >>return n; >}
Josiah Anderson
...
Gabriel Wilson
My uni requires all CS to take a choice of two: Calc 3, linear algebra, or diffy q
Colton Turner
its sounds like an entry level programming course ie. introduction to programming
yes, it is a retarded, inefficient data representation, but they aren't exactly writing a high performance arbitrary length integral math library, its only to serve as an example to them, mainly as a way so they can implement an elementary school algorithm
i imagine its purely for the sake of this assignment, and while they could just use C, it wouldn't help at all. personally i think schools/unis should start by teaching C programming so students get a good handle on procedural programming, as well as the c standard library, before migrating over to C++
this is what my university did and it worked great in my opinion
Zachary Sanders
>i imagine its purely for the sake of this assignment, and while they could just use C, it wouldn't help at all. personally i think schools/unis should start by teaching C programming so students get a good handle on procedural programming, as well as the c standard library, before migrating over to C++
C++ standard library is better. Why fuck around with cstring and char* when you have std::string
Owen Diaz
Anywhere but in the US you can't do CS without at the very least calc 1 (calc 3 for reputable schools). Try again.
Christian Gray
>implying calculus 3 is impressive >implying cs majors retain a working knowledge of calculus after they barely pass the course
kek
Liam Jones
Oh I'm sorry. You probably live in Detroit, so you're comparing American calc 3 to civilized real analysis which contains calc 3, topology, integration and summability theory and asymptotical analysis.
Matthew Martin
post syllabus or gtfo
Lucas Davis
I don't know if the people who post this picture are memeing or they're just actual idiots. That's the Veeky Forums dilemma I guess.
Isaiah Cook
addition by subduction
Dylan Powell
in country you can't do comp sci if you haven't done clac 2 and linear algebra
Justin Brooks
>Don't use one of the most powerful tools in the language >Waste memory by using 1 array cell for a digit Brainlet fucking problem >What is 2nd grade subtraction Brainlet fucking thread. Seriously man, just read this en.wikipedia.org/wiki/Subtraction and learn what cpp arrays are and you're set. Stop embarassing yourself and DIY.
Nicholas Morales
>You can major in CS without taking linear algebra
Grayson Gray
Yeah.. I don't even understand how this is considered a problem at all. ASCII already represents numbers in a sequence. There is zero work to this.
Gavin Mitchell
This. Wtf. What a shit institution.
>I once thought that I would have to compete with people from Britain in the workforce
Wyatt Cruz
See
Jace Ross
First two years, while you physishits were busy wrapping your head around muh small variation of x >Complex numbers and trigonometry >Integral calculus >Linear diff eqs >Sequences >Continuous functions, differentiable functions >Asymptotical analysis (you know, the fundamental thing that nobody here knows because muh l'hospital's rule) >Naive set theory >General algebra >Number theory >Polynomials >Linear algebra in finite and infinite dimensions >Inner product spaces >Numerical series >Combinatorics and discrete probability theory >Countability >Sequences and series of functions >Improper integrals and parameter integrals >Summability theory and integrability theory >Normed vector spaces and Banach spaces >Topology in metric spaces >Compacity >Power series >Partial derivatives >Differentials >Point mechanics >Rotating solid mechanics >Charged particle mechanics >Schrodinger's equation >Electromagnetism (integral and local laws) >Vector calculus >Maxwell's equations >Circuit analysis >Optics >Thermodynamics (1st and 2nd laws, state changes, statistics) >Chemistry (thermodynamics, acids, redox, kinetics) >Signal processing >Logic and program proofs >Tree and graph theory >Numerical methods >Dynamic programming >Language theory and finite state automata There. That's the bare minimum to enroll for CS in a civilized country after doing two years of these at 44+ hours per week.
inb4 physics boi rationalizes his uneducated situation by pretending he did more at freshman and I don't remember 1% of that
