类型转换 - 如何将C++ string 类型的每一位字符转换成int（并不是将整个string转换成int）？

string str ="123456";如何把str的每一位str[i]转换成数字？ 已经尝试：用int(str[i])只能得到ascii码。用atoi(str.c_str())也只能将整个stri...

From [C++discussion group] 2017-04-17 12:58:45 0  2  883

这个使用牛顿迭代法求立方根的程序哪里错了？

运行结果不正确，不知道为什么，希望能够得到指教。#include <iostream> #include <math.h> using namespace ...

From [C++discussion group] 2016-11-16 13:54:58 0  2  882

c++ - Type conversion between const int * and int * const

const int *: The pointer itself is mutable, and the value it points to is immutable int * const: The pointer i...

From [C++discussion group] 2017-05-16 13:31:16 0  1  881

How to apply C++ separated compilation?

C++ Primer's introduction to separated compilation is very simple, so I wanted to try how to use it. Run the f...

From [C++discussion group] 2017-06-20 10:06:13 0  1  879

c++ - Unnamed namespace cannot be placed in .h

Unnamed namespaces cannot be placed in .h. Can you give an example why this is not allowed? I haven't found an...

From [C++discussion group] 2017-05-16 13:21:09 0  1  879

c++ - cocos2d cannot be downloaded? Help! ! !

Recently I want to learn cocos2d game development, and I want to use the lua language. I don’t know what the r...

From [C++discussion group] 2017-06-13 09:22:55 0  1  877

c++11 - 这段 C++ 代码究竟创建了多少个对象？

{代码...} 我的理解是应该创建了四个对象，其中一个是临时对象，由combine(stu1, stu2)函数返回时创建。类的构造函数执行打印一行字符串的功能，通过有多少行字符串可以推出执行了多少次构造函数，代码在运行时...

From [C++discussion group] 2017-04-17 13:05:32 0  3  876

c语言 - bmp图像如何用c/c++处理?

求代码，用c/c++进行bmp图像的处理，处理内容包括旋转，灰度图，二值图等等。

From [C++discussion group] 2017-04-17 13:09:18 0  10  875

c++ - 为什么memcpy(calendar, cal, sizeof(CALENDAR))这里输出是错误的啊，搞不懂了

不知道是什么原因 {代码...} 输出是这样的

From [C++discussion group] 2017-04-17 12:03:19 0  2  875

Unit testing - some issues related to code organization in c++ testing

I am a novice C++ programmer. I used JavaScript most of the time. Now due to homework needs, I am writing a pr...

From [C++discussion group] 2017-05-31 10:38:53 0  1  871

Image processing - C++ freeimage uses online examples to invert the image, and a very strange result appears.

I have recently been using the C++ image processing library freeimage. I encountered a problem here. The cause...

From [C++discussion group] 2017-05-16 13:21:19 0  1  871

服务器端 - 采用nginx做web服务器，C++开发应用程序 出现拒绝连接请求？

想尝试用C++开发后台应用程序，通过nginx转发。一切按照http://blog.csdn.net/allenlinrui/article/details/19419721 这个博客上的教程，改装的库都装了，测试例程都...

From [C++discussion group] 2017-04-17 13:41:37 0  3  871

java - How to design a class in this case? Are there any design patterns?

A kind of data passing through the hardware device uses a special format. The first paragraph is the id, and t...

From [C++discussion group] 2017-06-17 09:15:50 0  5  870

c++ - read-only variable is not assignable问题

不知道该如何叙述这个问题，请看代码： {代码...} 应该是set内部的问题吧？求高人解释，非常感谢...

From [C++discussion group] 2017-04-17 14:25:34 0  3  869

How to implement bind yourself?

{Code...} I don’t understand the code in the middle. How is it implemented with part 3? Who can write a simple...

From [C++discussion group] 2017-06-15 09:23:57 0  1  867