computer-science

问题 I have this assignment in which i will show the prompt for it: Write a program that reads in a set of test score data from the user. (Test scores should be entered in decimal form to represent the percentage grade). Once the user has finished entering the test scores (entering -1 will signal the end of input), print out the number of tests entered, the average of the tests, and the standard deviation. Use the following formula (Welford’s method) to calculate the standard deviation: (Standard

问题 I'm having problem with substitution cipher that I can't figure out my code functions correctly but it prints extra exclamation mark at the end of my ciphertext here is my important part of the code int keylen = strlen(argv[1]); string key = argv[1]; printf("ciphertext: "); for (int i = 0; i < keylen; i++) { //if it is a lower character we remove the value of a //to make it the letters start form 0 if (islower(plaintext[i])) { int x = plaintext[i] - 'a'; printf("%c", tolower(key[x])); } //

问题 Locked . There are disputes about this question’s content being resolved at this time. It is not currently accepting new answers or interactions. Hello I need help with one of my Google foobar questions this is what I've got so far. package com.google.challenges; import java.math.BigInteger; public class Answer{ public static String answer (int[] xs){ BigInteger result = new BigInteger("1"); int xsLen = xs.length, pos = 0; int[] negatives = new int[xsLen]; if (xsLen == 1){ return Integer

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 days ago . I am trying to write a function, (codeWords t) , which traverses a Huffman tree (adds #\0 when it goes left, adds #\1 when it goes right...) and returns these values in pairs of the symbol at a leaf along with its associated encoding as a string over the characters #\0 and #\1 . Similar to what this or

问题 What are the relative strenghts and weaknesses of compiled and interpreted languages? Why? 回答1: Neither approach has a clear advantage over the other - if one approach was always better, chances are that we'd start using it everywhere! Generally speaking , compilers offer the following advantages: Because they can see all the code up-front, they can perform a number of analyses and optimizations when generating code that makes the final version of the code executed faster than just

问题 if you are to choose a random a 512-bit integer N that is not a multiple of 2, 3, or 5 What is the probability that N is prime? i don't know the algorithm behind this one... i'm trying to work on a project but this is the starting point.. :) 回答1: The number of primes less than n=2 512 is approximately n/log(n). The number of numbers you are considering is 4/15*n, so the probability you are looking for is 15/(4*log(n)), which is about 1 %. 回答2: Probability bounds You may use the following

问题 I can't seem to find a direct answer on this. Using several search engines gives me very vague results, or only answers half the question. So, to elaborate, when you write a program and it's compiled/interpreted, does the computer read each line sequentially in chronological order or does it skip around by default? Example: Using C-style source because it was the first thing that came to mind. printf("I'm the first line of your program! Yay!"); printf("I'm the second, woo!"); printf("And I'm

问题 I can't seem to find a direct answer on this. Using several search engines gives me very vague results, or only answers half the question. So, to elaborate, when you write a program and it's compiled/interpreted, does the computer read each line sequentially in chronological order or does it skip around by default? Example: Using C-style source because it was the first thing that came to mind. printf("I'm the first line of your program! Yay!"); printf("I'm the second, woo!"); printf("And I'm

问题 After some research about algorithms I found two terms which confuses me. I've read at least 20 papers and yet, there aren't any clear definition about either. I hope someone can help me tell the difference between heuristics and metaheuristics algorithms. And if possible, add the source of it. ps: I already know what the meaning is of the words, but I don't know what the exact difference is between them in computer science. thanks in advance 回答1: You could think of a heuristic like an

问题 I am not able to understand the difference between Instruction set and Instruction set architecture. I know what is an instruction set . Instruction set just defines the possible instructions we can give to the processor and how the instruction are give ( therefore the instruction format ) to the processor. Now what is Instruction set architecture ? I have looked up wikipedia, it has a page on instruction set and inside it, on the first line there is a link to instruction set architecture