【发布时间】:2014-11-18 05:29:42
【问题描述】:
// program that split a string and stock words in a vector array
#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main()
{
cout << "substring using vector test\n" << endl;
bool reste(1);
vector<string> mots; // our vector 'word' mots is french vector
size_t found(-1); // init at - 1 because i need to wirte +1 to start at 0
int prevFound(-1); // same explanation, prevFound meaning previous found
string chaine ("let's test this piece of code");
do
{
found = chaine.find(" ",found+1); // looking for the first space encountered
if (found!=string::npos) // if a space is found..
{
cout << "\nSpace found at: " << found << '\n'; // position of the first space
mots.push_back(chaine.substr(prevFound+1,found-prevFound)); // add a 'case' in vector and substract the word //
prevFound = found; // stock the actual pos in the previous for the next loop
}
if (found==string::npos) // if no space is remaining, extract last word
{
cout << "\nlast word\n\n" << endl;
mots.push_back(chaine.substr(prevFound+1,found-prevFound));
reste = 0;
}
}while (reste);
cout << "\nraw sentence : " << chaine << endl;
unsigned int taille = mots.size(); // taille meaning size
cout << "number of words" << taille << "\n" << endl;
for (int i(0); i<=taille; i++) // loop showing the extracted words
{
cout << mots[i] << '\n';
}
return 0;
}
感谢您的宝贵时间。 我试图用我的母语翻译我的大部分代码,我可能与我的解释无关。 我已经在网上学习 c++ 两个星期了,请原谅。
我只是想知道为什么我的代码编译和执行但最后崩溃了,我的代码在静态数组中运行良好。 也许我需要一个固定的容器? 如果是,有人可以用 std::set 更正我的代码吗? 提前致谢。
【问题讨论】:
-
你的最后一个循环循环了一个太多的索引,所以你访问
mots越界了。 -
因为在 if (found==string::npos) found-prevFound 的情况下,“npos 是一个静态成员常量值,对于 size_t 类型的元素具有最大可能值”对于 substr 的长度参数到 big nr
标签: c++ string vector split substring