C++ 如何拆分方程式的字符串

我是新来的，所以如果我犯了错误，请原谅我

我需要一个将字符串拆分为字符的程序。我的意思是如果用户写下“你好”这个程序应该是

“a[]={'H'，'e'，'l'，'l'，'o'}”

或者类似的东西。C++真的有可能吗？我要用它来计算方程式。如果您有更好的主意（没有

ax^2+bx+c

），请告诉我。谢谢你的帮助。祝您愉快。

从字符串中提取字符并将其存储到字符数组中 简单方法（使用字符串索引）：

不要忘记使用

delete

释放内存，该内存是使用

new

操作符分配给字符数组的，如下所示：

delete [] charArray; 删除[]字符； 否则，程序中可能会出现内存泄漏

要从字符串中提取整数字符并将其存储到整数数组中，请执行以下操作： 以下程序应能帮助您：

#include<iostream>

using namespace std;
// Using the namespace std to use string.

int main(int argc, char** argv) {
    string input;
    cout << "Enter a string: ";
    cin>>input;     // To read the input from the user.
    
    int strLength = input.length(); // To compute the length of the string.
    char * charArray = new char[strLength]; //Dynamic memory allocation
    int loopVar = 0;

    /**
     * The following for loop converts the string into an array.
    */
    for (const char* iterativeVar = input.c_str(); *iterativeVar; iterativeVar++) {
        charArray[loopVar] = *iterativeVar;
        ++loopVar;
    }

    cout << endl << "The elements of the character array are as follows: {";
    for (int i = 0; i < strLength; i++) {
        if (i != strLength - 1) {
            cout << "\'" << charArray[i] << "\', ";
        } else {
            cout << "\'" << charArray[i] << "\'}";
        }   
    }

    delete [] charArray;
    return 0;
}

#include<iostream>

using namespace std;
// Using the namespace std to use string.

int main(int argc, char** argv) {
    string input;
    cout << "Enter a number: ";
    cin>>input;     // To read the input from the user.
    
    int strLength = input.length(); // To compute the length of the string.
    int * intArray = new int[strLength]; //Dynamic memory allocation
    int loopVar = 0;

    /**
     * The following for loop converts the string into an array.
    */
    for (const char* iterativeVar = input.c_str(); *iterativeVar; iterativeVar++) {
        intArray[loopVar] = (*iterativeVar-'0');
        ++loopVar;
    }

    cout << endl << "The elements of the integer array are as follows: {";
    for (int i = 0; i < strLength; i++) {
        if (i != strLength - 1) {
            cout << intArray[i] << ", ";
        } else {
            cout <<intArray[i]<<"}";
        }   
    }

    delete [] intArray;
    return 0;
}

#包括
使用名称空间std；
//使用名称空间std来使用字符串。
int main（int argc，字符**argv）{
字符串输入；
cout>input；//从用户处读取输入。
int strLength=input.length（）；//计算字符串的长度。
int*intArray=newint[strLength]；//动态内存分配
int-loopVar=0；
/**
*下面的for循环将字符串转换为数组。
*/
for（const char*iterativeVar=input.c_str（）；*iterativeVar；iterativeVar++）{
intArray[loopVar]=（*iterativeVar-'0'）；
++loopVar；
}
不能仅仅将字符串存储到
char
数组中吗？您不必做任何特殊的事情来将字符串“拆分”为char。
string s=“Hello”；std:：不能谢谢您。这对我帮助很大。
Enter a string: Hello

The elements of the character array are as follows: {'H', 'e', 'l', 'l', 'o'}
RUN SUCCESSFUL (total time: 2s)
newmain.cpp: In function 'int main(int, char**)':
newmain.cpp:23:42: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]
     for (char* iterativeVar = input.c_str(); *iterativeVar; iterativeVar++) {
delete [] charArray;
#include<iostream>

using namespace std;
// Using the namespace std to use string.

int main(int argc, char** argv) {
    string input;
    cout << "Enter a number: ";
    cin>>input;     // To read the input from the user.
    
    int strLength = input.length(); // To compute the length of the string.
    int * intArray = new int[strLength]; //Dynamic memory allocation
    int loopVar = 0;

    /**
     * The following for loop converts the string into an array.
    */
    for (const char* iterativeVar = input.c_str(); *iterativeVar; iterativeVar++) {
        intArray[loopVar] = (*iterativeVar-'0');
        ++loopVar;
    }

    cout << endl << "The elements of the integer array are as follows: {";
    for (int i = 0; i < strLength; i++) {
        if (i != strLength - 1) {
            cout << intArray[i] << ", ";
        } else {
            cout <<intArray[i]<<"}";
        }   
    }

    delete [] intArray;
    return 0;
}

Enter a number: 123456789

The elements of the integer array are as follows: {1, 2, 3, 4, 5, 6, 7, 8, 9}
RUN SUCCESSFUL (total time: 4s)