c++ 当使用全局变量调用3次时，我的函数increment不会打印6 [duplicate]

6qqygrtg 于 2024-01-09 发布在其他

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What is a debugger and how can it help me diagnose problems?（2个答案）
5天前关闭。
我有一个标题叫做“counter. h”：

#ifndef REMAINDER_COUNTER_H
#define REMAINDER_COUNTER_H
extern int count;
int read();
int increment();
int decrement();
#endif //REMAINDER_COUNTER_H

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名为counter.cpp的c++文件：

int count;
int read(){
    return count;
}
int increment(){
    if (count < 5)
        count++;
    return count;
}
int decrement(){
    if (count > 0)
        count--;
    return count;
}

型
主文件名为“mainxc.cpp”：

#include <iostream>
#include "counter.h"
int main(){
    count = 2;
    for (int i = count; i <= 6; i+=2)
        increment();
    std::cout << read();
}

型
我尝试只使用函数read（）3次就得到6，但它不打印6，而是打印5。为什么？

c++

来源：https://stackoverflow.com/questions/77750067/my-function-increment-does-not-print-6-when-called-3-times-using-a-global-variab

1条答案

按热度按时间

hfwmuf9z1#

下面是一个类的例子：

#include <iostream>
// You have an invariant in your code 0 <= m_count <= 5
// in C++ that means : wrap it in a class (one of the main
// responsibility of classes is to safeguard invariants)
class counter_t
{
public:
    int increment()
    {
        if (m_count < 5) 
        {
            ++m_count;
        }
        return m_count;
    }
    int decrement()
    {
        if (m_count > 0) 
        {
            --m_count;
        }
        return m_count;
    }
    int get() // kind of convention to call readouts get (or get_count);
    {
        return m_count;
    }
private:
    int m_count{ 0 }; // Initializes m_count to 0
};
int main()
{
    counter_t counter;
    for(int n=0; n < 7; ++n) // convention is to use `<` instead of `<=`
    {
        counter.increment();
    }
    std::cout << counter.get();
    return 0;
}

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c++ 当使用全局变量调用3次时，我的函数increment不会打印6 [duplicate]

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