Question

我想要的是一个多行文本输入，并能够计算小写字母，大写字母，句号，逗号，空格，换行符和其他字符的数量。输入。

我试图在while循环中只使用一个带getline的字符串输入，每个标点符号类别都有一个运行计数。

我只是不知道如何实际计算每行中每种字符类型的数量。给定一个字符串，我如何计算每种类型的数量？

到目前为止，这是我的代码（显然不完整）：

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <cmath>
#include <string>

using namespace std;

int main(){
    cout << "This program takes any number of sentences as inputs. " << endl;
    cout << "It will count the number of lower-case letters and upper-case letters. " << endl;
    cout << "It will also count the number of periods, exclamation marks, spaces, end-lines, etc. " << endl;
    cout << " " << endl;
    cout << "Please type your text, pressing enter whenever you wish to end a line. " << endl;
    cout << "Use the EOF key (CTRL + Z on Windows) when you are finished. " << endl;

    string InputString; // This is the string that will be used iteratively, for each line.

    int NumberOfLowerCase = 0;
    int NumberOfUpperCase = 0;
    int NumberOfSpaces = 0;     // spaces
    int NumberOfTabs = 0;       // tabs
    int NumberOfPeriods = 0;    // periods
    int NumberOfCommas = 0;     // commas
    int NumberOfOtherChars = 0; // other characters
    int NumberOfEnters = 0;     // end of line, will be incremented each loop

    do {
        getline(cin, InputString);   // input
        cout << InputString << endl; // filler just to test the input 
        NumberOfLowerCase = NumberOfLowerCase + 0   // I don't know what I should be adding
                                                    // (obviously not zero, that's just a filler)
    } while (!cin.eof() && cin.good());

    system("pause");
    return 0;
}

Answer 1

如果您只想要唯一字符的数量，请使用set！您可以将所有角色都推入到集合中，然后只需检查集合的大小，您就可以开始了！

如果你真的想知道每个角色中有多少你可以使用map（实际上它使用了一套装置！）。使用地图，给定一些字符c，您可以执行

std::map<char, int> counter;
//do stuff...
counter[c]++; //increment the number of character c we've found
//do more stuff...
std::cout << "Found " << counter['A'] << " A's!" << std::endl;

Answer 2

请参阅these有用的功能。在这里你会做什么：

config/secrets.yml

Answer 3

这是我写得很快的一个非常简单的例子。当然有更好的方法，但这应该让你知道如何做到这一点。一个问题：您是直接从控制台读取文件还是从istream读取文件？

int lowerCase = 0;
int upperCase = 0;
int spaces = 0;     // spaces
int tabs = 0;       // tabs
int newLines = 0;   // end of line, will be incremented each loop
int periods = 0;    // periods
int commas = 0;     // commas
int otherChars = 0;

// read from istream, char by char
for (char ch; cin >> noskipws >> ch;) {
    // test which classification or char ch is and increment its count
    if (islower(ch))
        ++lowerCase;
    else if (isupper(ch))
        ++upperCase;
    else if (ch == ' ')
        ++spaces;
    else if (ch == '\t')
        ++tabs;
    else if (ch == '\n')
        ++newLines;
    else if (ch == '.')
        ++periods;
    else if (ch == ',')
        ++commas;
    else
        ++otherChars;
}

cout << "Number of characters of each type:\n";

cout << "lowerCase:\t" << lowerCase << '\n'
     << "upperCase:\t" << upperCase << '\n'
     << "spaces:\t\t" << spaces << '\n'
     << "tabs:\t\t" << tabs << '\n'
     << "periods:\t" << periods << '\n'
     << "commas:\t\t" << commas << '\n'
     << "newLines:\t" << newLines << '\n'
     << "otherChars:\t" << otherChars << '\n';

计算段落中字母类型数量的程序，C ++

3 个答案: