在不使用向量的情况下将字符串拆分为C ++中的数组

问题描述

我正在尝试使用C ++中的vector将用空格分隔的字符串插入到字符串 without 中.例如:

I am trying to insert a string separated by spaces into an array of strings without using vector in C++. For example:

using namespace std;
int main() {
    string line = "test one two three.";
    string arr[4];

    //codes here to put each word in string line into string array arr
    for(int i = 0; i < 4; i++) {
        cout << arr[i] << endl;
    }
}

我希望输出为:

test
one
two
three.

我知道在C ++中还有其他问题要问字符串>数组，但是找不到满足我条件的答案:不使用向量将字符串拆分成数组.

I know there are already other questions asking string > array in C++, but I could not find any answer satisfying my conditions: splitting a string into an array WITHOUT using vector.

推荐答案

可以使用 std::stringstream 类(其构造函数将字符串作为参数).构建完成后，您可以在其上使用>>运算符(就像在基于常规文件的流上一样)，该运算符将从中提取或 tokenize 单词:

It is possible to turn the string into a stream by using the std::stringstream class (its constructor takes a string as parameter). Once it's built, you can use the >> operator on it (like on regular file based streams), which will extract, or tokenize word from it:

#include <iostream>
#include <sstream>

using namespace std;

int main(){
    string line = "test one two three.";
    string arr[4];
    int i = 0;
    stringstream ssin(line);
    while (ssin.good() && i < 4){
        ssin >> arr[i];
        ++i;
    }
    for(i = 0; i < 4; i++){
        cout << arr[i] << endl;
    }
}

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