我真的很喜欢这个程序的帮助，因为我无法弄清楚该怎么做。我尝试在网上搜索可以指向正确方向的答案或其他东西，但这对我来说有点困难，因为我只是在学习如何编码。我将不胜感激！
你要写一个程序，帮助圣诞老人处理他的精灵所做的工作。您将使用名为elves.dat的数据文件。每个精灵都会有一条线。该行将包含精灵的名字和精灵制作的玩具数量。您将从文件中读取并将值放在并行数组中。你不知道有多少精灵，所以你必须阅读直到文件结束和计数。您将需要第三个并行的字符串数组来记录每个精灵的评级。您应该声明具有50个组件容量的阵列。
程序应该读入数组。它应该查看每个精灵制作的玩具数量，并在平行阵列中记录评级。下表确定了评级。然后程序应该在整齐的标记列中并排打印出阵列。它应该打印出精灵制造的玩具总数，制造超过500件玩具的精灵数量，制造最多玩具的精灵的名字，以及制造玩具最少的精灵的名字。每个计算都应该有自己的功能。应该在进行计算的函数中输出NO。所有输出都应在一个输出功能中完成。请记住始终将数组中包含数组的元素数传递给函数。
玩具制造........评级
500或更多：***** 5星
在300到499之间：*** 3星
介于200和299之间：* 1星
200以下： - 无
这里是elves.dat中的信息：
Smiley 662
Curley 88
Clementine 335
Jasper 105
Lucinda 775
Brunhilda 103
Florence 441
Oskar 820
Snowflake 990
Bernard 690
Punch 298
Chuckie 10
Frosty 102
Snowman 311
April 830
Merry 299
Sunshine 331
Buddy 1234
Carol 271
Misty 111
Harold 52
Henry 292
Twinkle 308
Starlight 703
Burr 112
Angelica 444
Bluenose 689
Harry 254
Twinkle 259
Stardust 121
Greensleeves 453
Noel 312
Happy 209
Yukon 534
Snowcap 190
Northpole 598
这是我的代码，我觉得我有一个非常基本的理解，但我知道我甚至没有接近！我很感激任何帮助，我真的需要它。
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int main() {
ifstream inFile;
inFile.open("elves.dat");
string elfName[50];
int ToysMade[50];
int count = 0;
int i;
//Read file until you've reached the end
while (!inFile.eof()){
inFile >> elfName;
inFile >> ToysMade;
count++;}
cout << "Elf: " << elfName <<endl;
cout << "Toys made: " << ToysMade <<endl;
inFile.close();
return 0;
}
答案 0 :(得分：0)
根据您的说法：这就是我设计程序的方式。我甚至可以通过使用struct或class使其看起来更简单，但我收集到的你在训练过程中并不是那么远。即使这可能比被问到的要先进一点。你提到了parallel arrays。而不是arrays我使用std::vectors代替它。您可以轻松地将vectors替换为常规arrays，但是由于我正在使用处理容器的library函数，因此执行计算的函数会发生变化。使用raw arrays，你必须做一堆for＆amp; while loops和comparison同时对bounds checks arrays #include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <iostream>
#include <iomanip>
#include <fstream>
// Typedefs
typedef std::vector<std::string> Strings;
typedef std::vector<unsigned> Values;
unsigned countToys( const Values& toys );
void determineRatings( const Values& toys, Values& ratings );
unsigned count5StarElves( const Values& toys );
std::string getBestElf( const Strings& elves, const Values& toys );
std::string getWorstElf( const Strings& elves, const Values& toys );
void displayStats( const unsigned numElves, const unsigned fiveStarElves,
const Strings& elves, const Values& toys, const Values& ratings,
const std::string& bestElf, const std::string& worstElf );
int main() {
// Create Containers Giving 50 available spots.
Strings elves;
elves.resize( 50 );
Values ratings;
ratings.resize( 50 );
Values toysMade;
toysMade.resize( 50 );
// Create, Open, Read From File & Close It
unsigned numElves = 0;
std::ifstream file;
file.open( "elves.dat" );
while ( file >> elves[numElves] >> toysMade[numElves] ) {
numElves++; // Need this to resize containers.
}
file.close();
// Adjust containers to fit number of elves.
const std::size_t newSize = numElves;
elves.resize( newSize );
ratings.resize( newSize );
toysMade.resize( newSize );
// Get The Stats -- Counting the total number of elves is called within the display function.
determineRatings( toysMade, ratings );
unsigned fiveStarElves = count5StarElves( ratings );
std::string bestElf = getBestElf( elves, toysMade );
std::string worstElf = getWorstElf( elves, toysMade );
// Display The Results
displayStats( numElves, fiveStarElves, elves, toysMade, ratings, bestElf, worstElf );
std::cout << "\nPress any key and enter to quit." << std::endl;
char c;
std::cin >> c;
return 0;
}
unsigned countToys( const Values& toys ) {
unsigned total = std::accumulate( toys.begin(), toys.end(), 0 );
return total;
}
void determineRatings( const Values& toys, Values& ratings ) {
for ( unsigned i = 0; i < toys.size(); i++ ) {
if ( toys[i] >= 500 ) {
ratings[i] = 5;
}
if ( toys[i] < 500 && toys[i] >= 300 ) {
ratings[i] = 3;
}
if ( toys[i] < 300 && toys[i] >= 200 ) {
ratings[i] = 1;
}
if ( toys[i] < 200 ) {
ratings[i] = 0;
}
}
};
unsigned count5StarElves( const Values& ratings ) {
unsigned fiveStartCount = 0;
for ( auto val : ratings ) {
if ( val == 5 ) {
fiveStartCount++;
}
}
return fiveStartCount;
}
std::string getBestElf( const Strings& elves, const Values& toys ) {
auto it = std::max_element( toys.begin(), toys.end() );
if ( it == toys.end() ) {
return "";
}
// for random access containers with O(1) - constant
return elves[it - toys.begin()];
// If using non-random containers use the following with O(n) - linear
// return std::distance(toys.begin(), it );
}
std::string getWorstElf( const Strings& elves, const Values& toys ) {
auto it = std::min_element( toys.begin(), toys.end() );
if ( it == toys.end() ) {
return "";
}
// for random access containers with O(1) - constant
return elves[it - toys.begin()];
// If using non-random containers use the following with O(n) - linear
// return std::distance(toys.begin(), it);
}
void displayStats( const unsigned numElves, const unsigned fiveStarElves,
const Strings& elves, const Values& toys, const Values& ratings,
const std::string& bestElf, const std::string& worstElf ) {
std::cout << "***********************************************\n";
std::cout << "* Welcome To Santa's Workshop: *\n";
std::cout << "* We have " << numElves << " working elves. *\n";
std::cout << "* Our Elves made a total of " << countToys( toys ) << " toys today. *\n";
std::cout << "***********************************************\n\n";
std::cout << "Here are their stats:\n";
std::cout << "===============================================\n";
// Calculate the longest name for proper screen output formatting.
std::size_t maxLength = 0;
for ( const auto name : elves ) {
if ( name.length() > maxLength ) {
maxLength = name.length();
}
}
std::cout << std::left << std::setw( maxLength + '\t' ) << "Elf Name:" << std::setfill( ' ' ) << "Toys Made:\t\tRating:\n" << std::endl;
for ( unsigned i = 0; i < numElves; i++ ) {
std::cout << std::left << std::setw( maxLength + '\t' ) << elves[i] << std::left << std::setfill( ' ' )
<< std::setw( 4 ) << std::left << toys[i] << std::left
<< "\t\t" << ratings[i] << " stars" << std::endl;
}
std::cout << "\n\n";
// Additional Stats:
std::cout << "There are " << fiveStarElves << " 5 Star Elves!\n";
std::cout << "The Best Elf is: " << bestElf << std::endl;
std::cout << "The Worst Elf is: " << worstElf << std::endl;
}
进行检查。您的整体计划看起来与此类似。
Smiley 662
Curley 88
Clementine 335
Jasper 105
Lucinda 775
Brunhilda 103
Florence 441
Oskar 820
Snowflake 990
Bernard 690
Punch 298
Chuckie 10
Frosty 102
Snowman 311
April 830
Merry 299
Sunshine 331
Buddy 1234
Carol 271
Misty 111
Harold 52
Henry 292
Twinkle 308
Starlight 703
Burr 112
Angelica 444
Bluenose 689
Harry 254
Twinkle 259
Stardust 121
Greensleeves 453
Noel 312
Happy 209
Yukon 534
Snowcap 190
Northpole 598
<强> elves.dat
displayStats() 编辑 - 如果您想在显示功能中做一些有点花哨的事情。将void displayStats( const unsigned numElves, const unsigned fiveStarElves,
const Strings& elves, const Values& toys, const Values& ratings,
const std::string& bestElf, const std::string& worstElf ) {
std::cout << "***********************************************\n";
std::cout << "* Welcome To Santa's Workshop: *\n";
std::cout << "* We have " << numElves << " working elves. *\n";
std::cout << "* Our Elves made a total of " << countToys( toys ) << " toys today. *\n";
std::cout << "***********************************************\n\n";
std::cout << "Here are their stats:\n";
std::cout << "===============================================\n";
// Calculate the longest name for proper screen output formatting.
std::size_t maxLength = 0;
for ( const auto name : elves ) {
if ( name.length() > maxLength ) {
maxLength = name.length();
}
}
std::cout << std::left << std::setw( maxLength + '\t' ) << "Elf Name:" << std::setfill( ' ' ) << "Toys Made:\t\tRating:\n" << std::endl;
// A little bit of magic: (not really) just pretty
Strings stars;
std::string str;
for each (auto star in ratings) {
if ( star == 0 ) {
str = std::string( "" );
}
if ( star == 1 ) {
str = std::string( "*" );
}
if ( star == 3 ) {
str = std::string( "***" );
}
if ( star == 5 ) {
str = std::string( "*****" );
}
stars.push_back( str );
}
for ( unsigned i = 0; i < numElves; i++ ) {
std::cout << std::left << std::setw( maxLength + '\t' ) << elves[i] << std::left << std::setfill( ' ' )
<< std::setw( 4 ) << std::left << toys[i] << std::left
<< "\t\t" << stars[i] /*ratings[i] << " stars"*/ << std::endl;
}
std::cout << "\n\n";
// Additional Stats:
std::cout << "There are " << fiveStarElves << " 5 Star Elves!\n";
std::cout << "The Best Elf is: " << bestElf << std::endl;
std::cout << "The Worst Elf is: " << worstElf << std::endl;
}
功能更改为：
'hedge_value'