Question

我需要一些帮助才能将此代码转换为C ++ 我会很感激的。

程序必须搜索字符串的字符串insido并显示它是否已找到。

#include "iostream"
#include "string"
#include "stdlib.h" 

using namespace std;

int main()
{
// Input Secuence
String Entrada = "ABCDE12345";
// Secence to search
String Secuencia = "DE12";
// Variable to store each letter and number of the secuence
Char Buscar;
//Flag to show if the secuence was found
Boolean Existe = false;

//Cicle to read all the Input Secuence
for (int i = 0; i < Entrada.Count(); i++) {
//The letter is stored
Char Letra = Entrada[i];
// This is the first letter in the secuence to search
Buscar = Secuencia[0];

//If the letter of the input secuence matchs with the first letter
//of the secuence to search, this is the base position then search
//if the word exist
if (Letra == Buscar) {

//Cicle to read all the word to search and start to compare heach letter
//of the input secuence starting from the current position.
for (inf x = 1; x z Secuencia.Count(); x++) {
// Obtaining the following letter of the input secuence
Letra = Entrada[i + x];
// Obtaining the following letter of the input secuence
Buscar = Secuencia[x];
//Compare if the letter are equal
if (letra == Buscar)
{
          //If they are equal the falg change to "true"
          Existe = false;
          //Out of the cicle
          break;
}
}
          //If the word is already fin it, then leave the cicle of reading
          if (Existe)
          {
                     //End of the cicle
                     break;
                     }
          }
 }
 //Show the input secuence
 Console.WriteLine("Entrada : " + Entrada);
 // SHow the output secuence
 Console.WriteLine("Secuencia a buscar : " + Secuencia);
 //Confirm if the word was found it
 if (Existe)
 {
    //If exist show "found the secuence searched"
    Console.WriteLine("La Encontre");
 }
 else {
   //If do not exist show "an error message"
    Console.WriteLine("No existe");
    }
 }
 }

我是C ++的新手，我真的迷失了很多项目

提前致谢

Answer 1

std::string能够使用其成员函数.find()搜索子字符串。

有了它，您的整个功能可以写成几行。

#include <iostream>
#include <string>

int main() {
    std::string entrada = "ABCDE12345";
    std::string secuencia = "DE12";

    std::cout << "Entrada : " << entrada << '\n'
              << "Secuencia a buscar : " << secuencia << '\n';

    if (entrada.find(secuencia) != std::string::npos) {
        std::cout << "La Encontre\n";
    } else {
        std::cout << "No existe\n";
    }
}

这里，std::string::npos是find返回的标记值，如果字符串不包含子序列（否则它将返回子序列开始处的字符的索引）。 / p>

如果您有权访问C ++ 17，您还可以使用std::search来指定所使用的算法。链接引用有一个示例，其中使用Boyer-Moore算法搜索子字符串。

需要帮助将其转换为C ++

1 个答案: