连字符替换为连字符c ++ [英] string repetition replaced by hyphen c++

问题描述

我是编码的初学者，正在尝试用连字符替换字符串中字母的所有重复的问题:即ABCDAKEA将变为ABCD-KE-.我使用了switch循环，它可以工作，但是我想要使其更短，并可能使用递归使其更有效.有任何想法吗?

I am a beginner at coding, and was trying this question that replaces all repetitions of a letter in a string with a hyphen: i.e ABCDAKEA will become ABCD-KE-.I used the switch loop and it works, but i want to make it shorter and maybe use recursion to make it more effective. Any ideas?

    #include<iostream>
    #include<string.h>
    using namespace std;
    int main()
    {
    char x[100];    
    int count[26]={0}; //initialised to zero
    cout<<"Enter string: ";
    cin>>x;
    for(int i=0; i<strlen(x); i++)
    {
    switch(x[i])
    {
    case 'a':
        {
        if((count[0]++)>1)
        x[i]='-';
        }
    case 'b':
        {
        if((count[1]++)>1)
        x[i]='-';
        }
    case 'c':
        {
        if((count[2]++)>1)
        x[i]='-';
        }
        //....and so on for all alphabets, ik not the cutest//
      }
      }

推荐答案

首先，请注意ASCII表中的英文大写字母在65-90的范围内.强制转换为大写字母static_cast<int>('A')将产生一个整数.如果大小写在65-90之间，我们知道这是一个大写字母.对于小写字母，范围是97-122.否则字符基本上不是字母.

First, notice English capital letters in ASCII table fall in this range 65-90. Casting a capital letter static_cast<int>('A') will yield an integer. If after casing the number is between 65-90, we know it is a capital letter. For small letters, the range is 97-122. Otherwise the character is not a letter basically.

选中创建布尔数组或向量并跟踪重复字母.简单的方法是

Check create an array or a vector of bool and track the repetitive letters. Simple approach is

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main()
{
    string str("ABCDAKEAK");
    vector<bool> vec(26,false);

    for(int i(0); i < str.size(); ++i){
        if(  !vec[static_cast<int>(str[i]) - 65]  ){
            cout << str[i];
            vec[static_cast<int>(str[i]) - 65] = true;
        }else{
            cout << "-";
        }   
    }
    cout << endl;

    return 0;
}

注意:我假设输入仅是字母，并且它们是大写字母.这个想法围绕通过布尔跟踪.

Note: I assume the input solely letters and they are capital. The idea is centered around tracking via bool.

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