如何制作柱状图?

Question

我在做图表时遇到了一个问题。我想在不改变代码的情况下在同一行中输出图表，并且不使其水平。我希望使用for循环来解决这个问题，因为我可以遍历所有元素，因为我有相同的元素。

---

代码如下:

# 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<<"nnEnter annual interest rate(%): ";
cin>>interest_rate;
interest_rate = interest_rate / 100;
cout<<"nnEnter loan term in years: ";
cin>>loan_term;
month = loan_term*12;
month_payment = (principal_amount*interest_rate + principal_amount) / month;
cout<<endl<<endl;
}
void outputStatistics()
{
cout<<"MonthtPayment(RM)tPrincipal(RM)tInterest(RM)tBalance(RM)n";
for(int i = 1; i <=month; i++)
{
cout<<i<<endl;
}
for(int j = 0; j <=month; j++)
{
cout<<"t"<<month_payment<<endl;
}
}
};
int main()
{
LoanCalculator obj;
obj.displayVariable();
obj.outputStatistics();
return 0;
}

上述代码的输出:

Enter loan amount (RM): 120

Enter annual interest rate(%): 1.2

Enter loan term in years: 1

Month   Payment(RM)     Principal(RM)   Interest(RM)    Balance(RM)
1
2
3
4
5
6
7
8
9
10
11
12  
10.12
10.12
10.12
10.12
10.12
10.12
10.12
10.12
10.12
10.12
10.12
10.12
10.12
Process returned 0 (0x0)   execution time : 3.940 s
Press any key to continue.

期望输出:

Enter loan amount (RM): 120

Enter annual interest rate(%): 1.2

Enter loan term in years: 1

Month   Payment(RM)     Principal(RM)   Interest(RM)    Balance(RM)
1       10.12
2       10.12
3       10.12
4       10.12
5       10.12
6       10.12
7       10.12
8       10.12
9       10.12
10      10.12
11      10.12
12      10.12
Process returned 0 (0x0)   execution time : 3.940 s
Press any key to continue.

Answer 1

你不需要撤销endl，你只需要重新组织你的代码，以便你在正确的顺序做事情，就像这样

void outputStatistics()
{
cout<<"MonthtPayment(RM)tPrincipal(RM)tInterest(RM)tBalance(RM)n";
for(int i = 1; i <=month; i++)
{
// output one row at a time
cout<<i<<"t"<<month_payment<<endl;
}
}

此代码一次输出一行，您的代码先输出一列，后输出下一列。

Answer 2

另一个选择是使用setw操纵符，但更好的选择是对这个基于列的图表使用t。

setw更灵活，因为你可以改变空格数.

但t将间隔4个空格每次使用它，这就是为什么我提到t是为这个基于列的图表。