相关疑难解决方法(0)

我的std :: string是utf-8编码所以很明显,str.length()返回错误的结果.

我发现了这些信息,但我不确定如何使用它来执行此操作:

以下字节序列用于表示字符.要使用的序列取决于字符的UCS代码编号:

   0x00000000 - 0x0000007F:
       0xxxxxxx

   0x00000080 - 0x000007FF:
       110xxxxx 10xxxxxx

   0x00000800 - 0x0000FFFF:
       1110xxxx 10xxxxxx 10xxxxxx

   0x00010000 - 0x001FFFFF:
       11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

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如何找到UTF-8编码的std :: string的实际长度？谢谢

我正在寻找如何在C++中打印,以便表格列宽度是固定的.目前我一直在使用的空间,做|和-,但只要数去两位数所有的走线变坏.

|---------|------------|-----------|
| NODE    |   ORDER    |   PARENT  |
|---------|------------|-----------|
|  0      |     0      |           |
|---------|------------|-----------|
|  1      |     7      |     7     |
|---------|------------|-----------|
|  2      |     1      |     0     |
|---------|------------|-----------|
|  3      |     5      |     5     |
|---------|------------|-----------|
|  4      |     3      |     6     |
|---------|------------|-----------|
|  5      |     4      |     4     |
|---------|------------|-----------|
|  6      |     2      |     2     |
|---------|------------|-----------|
|  7      |     6      |     4     |
|---------|------------|-----------|

我有以下代码要打印：

cout<<current->bookId<<"\t\t"<<current->bookName<<"\t\t"<<current->year<<"\t\t";
cout<<"Checked out by student "<<current->storedBy<<endl;

看起来像这样

BookId          BookName                Year            Status
1000            Machine Learning                1997            Checked out by student 21000000
1200            Data Mining             1991            Checked out by student 21000020
1400            C++ How to Program              2005            Checked out by student 21000020
1500            Pattern Recognition             2000            Checked out by student 21000000

我该怎么做才能做到这一点：

BookId          BookName                        Year            Status
1000            Machine Learning                1997            Checked out by student 21000000
1200            Data Mining                     1991            Checked out by student 21000020
1400            C++ How to Program              2005            Checked …

我在做图表时遇到问题。我希望在同一行中输出图表，而不更改代码，也不使其水平。我希望使用 for 循环来解决这个问题，因为我可以迭代所有内容，因为我有相同的元素。

代码显示如下：

# include <iostream>
using namespace std;

class InterestCalculator
{
protected:
    float principal_amount = 320.8;
    float interest_rate = 60.7;
    float interest = interest_rate/100 * principal_amount; 
public:
    void printInterest()
    {
    cout<<"Principal Amount: RM "<<principal_amount<<endl;
    cout<<"Interest Rate(%): "<<interest_rate<<endl;
    cout<<"Interest: RM"<<interest<<endl;
    }
};

class LoanCalculator : public InterestCalculator
{
private:
    int loan_term;
    int month;
    float month_payment;
public:

void displayVariable()
{
    cout<<"Enter loan amount (RM): ";
    cin>>principal_amount;
    cout<<"\n\nEnter annual interest rate(%): ";
    cin>>interest_rate;
    interest_rate = interest_rate / 100;
    cout<<"\n\nEnter …