Question

#ifndef CALC_H
#define CALC_H


class calc
{
    double numb1;
    double numb2;
    public:
        calc();
        void FUN_SUM();
        void FUN_Subtraction();
        void FUN_Multiplication();
        void FUN_Division();
        void FUN_Power();
        void FUN_Squareroot();
        void FUN_Switch();
        void FUN_Loob();

};

#endif // CALC_H



#include "calc.h"
#include <iostream>
#include <cmath>
using namespace std;
calc::calc()
{
    numb1 = 0;
    numb2 = 0;
}
void calc::FUN_SUM()
{
     cout << "Enter number 1 " << endl;
    cin >> numb1;
    cout << "Enter number 2 " << endl;
    cin >> numb2;
    double Result_Of_Sum;
    Result_Of_Sum = numb1+numb2;
    cout << "The result of Sum = " << Result_Of_Sum << endl;


}

void calc::FUN_Subtraction()
{
     cout << "Enter number 1 " << endl;
 cin >> numb1;
 cout << "Enter number 2 " << endl;
 cin >> numb2;
 double Result_Of_Subtraction;
 Result_Of_Subtraction = numb1 - numb2;
 cout << "The result of Subtraction = " << Result_Of_Subtraction << endl;
}
void calc::FUN_Multiplication()
{
     cout << "Enter number 1 " << endl;
    cin >> numb1;
    cout << "Enter number 2 " << endl;
    cin >> numb2;
    double Result_Of_Multiplication;
    Result_Of_Multiplication = numb1*numb2;
    cout << "The result of Multiplication = " << Result_Of_Multiplication << endl;

}

void calc::FUN_Division()
{
    cout << "Enter number 1 " << endl;
    cin >> numb1;
    cout << "Enter number 2 " << endl;
    cin >> numb2;
    double Result_Of_Division ;
    Result_Of_Division = numb1/numb2;
    cout << "The result of Division = " << Result_Of_Division << endl;
}

void calc::FUN_Power()
{
    cout << "Enter number 1 " << endl;
cin >> numb1;
cout << "Enter number 2 " << endl;
cin >> numb2;
double Result_Of_Power;
Result_Of_Power = pow(numb1,numb2);
cout << "The result of Power = " << Result_Of_Power << endl;
}

void calc::FUN_Squareroot()
{
    cout << "Enter the tow number you want Square root \n";
    cin >> numb1;

    double Result_Of_Square_root;
    Result_Of_Square_root = sqrt(numb1);
    cout << "The result of Square root = " << Result_Of_Square_root << endl;
}
void calc::FUN_Switch()
{
 int S;
    cout << "Enter the number you operator do you want do it  " << endl;
    cout << "1- Addition" << endl;
    cout << "2- Subtraction" << endl;
    cout << "3- Multiplication" << endl;
    cout << "4- Division" << endl;
    cout << "5- Power" << endl;
     cout << "6- Square Root" << endl;
      cout << "7- Exit" << endl;
    cin >> S;

    switch (S)
    {
    case 1:

        FUN_SUM();
        break;

    case 2:

        FUN_Subtraction();
        break;

    case 3:

        FUN_Multiplication();
        break;

    case 4:

        FUN_Division();
        break;

    case 5:

        FUN_Power();
        break;

    case 6:

        FUN_Squareroot();
        break;

    default :
        break;

    }
}

void calc::FUN_Loob()
{
     char L;

    do
    {

        FUN_Switch();

 cout << "Do you want do another operator ( 'y' or 'n'?) \n";
        cin >> L;
if (L== 'y' || L=='Y' || L=='n' || L=='N')

    continue;
else
    cout << "you are enter roang later\n";

    }

    while (L == 'Y' || L == 'y' );

}


#include <iostream>
#include "calc.h"
using namespace std;

int main()
{
  cout << "Welcome to my simple Calculator\n";
calc simple_calc;

simple_calc.FUN_Loob();
cout << "\n Tank you for use my App :) :) " << endl;

return 0; 
}

我的问题是如何使用常规计算器

例如1 + 9 * 8-1 + 5我想我的程序是这样的，但我不知道如何？ :( :(

Answer 1

编写计算器并非易事，因为涉及的内容更多：

运营商优先
分组
评估表达

运营商优先
运算符优先级是操作的分组，例如在加法和减法之前执行所有乘法和除法。计算器程序应该处理优先级而不括号（分组）。

<强>组合
更高级的计算器将允许使用括号对表达式进行分组。计算器应该能够评估最内层的表达并向外工作。

评估表达式
这意味着允许超过1位数字，以及数字和符号之间的空格。此外，一旦表达式解析，就需要对其进行评估。计算器应根据操作（由用户指定）调用适当的函数。

我建议您允许用户输入表达式，并且您的程序将其作为字符串读取。然后，您的程序将解析字符串，然后评估表达式。

在网络和StackOverflow中搜索＆＃34; c ++计算器＆＃34;例如。

使用许多算术运算符c ++计算很多值

1 个答案: