C ++字符串到整数问题使用的atoi（str.c_str（）） [英] C++ String to Integer Issue Using atoi(str.c_str())

问题描述

我试图重新present一个变量在一个字符串转换为整数，我这样做使用的形式;

I am trying to represent a variable in the form of a string to a integer, I have done so using;

atoi(str.c_str()) 

该字符串最初从一个文本文件中获取并存储成;

The string is originally obtained from a text file and stored into a;

CharArrayPtr cmemblock;

，然后再psented作为一个字符串$ P $;

Which is then represented as a string;

    string str;

    for(int i = 0; i < numberofvalues; i++)
    {   
        str = cmemblock[i];
        int number = atoi(str.c_str());
        cout << number;


    }

如果我是改变COUT打印STR;

If I was to change the 'cout' to print str;

str = cmemblock[i];
int number = atoi(str.c_str());
cout << str;

数显示正确存储在文本文件中。

The number show correctly as stored in the text file

不过，我需要的输出是一个整数，这样我就可以重新present它在一个循环来搜索存储在阵列中的价值。因此，这是数字进场，这就是为什么我要求你的帮助，当原因;

However, I require the output to be an integer so that I could represent it in a loop to search for a value stored in a array. So this is where 'number' comes into play, which is the reason why I am asking for your help, when;

cout << number;

每当一个新行读它重新psented为$ P $'0'我将如何去删除此？如果你需要我的全code是在几个不同的.cpp文件和prevent有人复制我的工作，我只能通过电子邮件发送你的，我确定你已经猜到这是一个大学的任务的一部分。

Whenever a new line is read it is represented as '0' how would I go about removing this? If your require my full code it is in several different .cpp files and to prevent anyone copying my work I can only email it you, im sure you have already guessed it is part of a University Assignment.

使用会员Adosi code，我想出了这一点;

Using Member Adosi code I came up with this;

         std::string str;

    for(int i = 0; i < numberofvalues; i++)
    {   

        str = cmemblock[i];
        std::stol(str);
        int number = std::stoi(str);
        cout << number;


    }

我得到一个错误R6010。我这样做不对吗？

I get an error R6010. Have I done this wrong?

推荐答案

的std :: Stoi旅馆（STR）

使用它来代替的atoi

C ++ 11有这个和其他一些功能，如的std ::短距起降（）长材，的std :: STOF（） 的花车等。

C++11 has this and a few other functions such as std::stol() for longs, std::stof() for floats, etc.

HTTP：//en.cp$p$pference。 COM / W / CPP /串/ basic_string的/ STOL

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