使用功能 [英] using functions

问题描述

好了，现在我开始工作这部分了，如何使用已定义的函数使它工作呢?以及我应该使用哪些项目使其成为我在较早的帖子中尝试过的myfuncion，并且您可以看到它不起作用，所以我回到了基础知识上，现在需要帮助弄清楚如何实现和创建自己的函数来做这个计算.感谢您的帮助

Ok now I got this part working how should I make this to work using a defined function? and what items should I use to make it a myfuncion I haves tried by the earlier posts and as you can see it is not working so I went back to the basic and now need help figuring out how to implement and create my own function to do this calculation. thanks for the help

#include <iostream>
#include <string>
const int SQUARE = 1;
const int TRIANGLE = 2;
const int RECTANGLE = 3;
const int CIRCLE = 4;
using namespace std;
int main()
{
    // Declare Variable
    int choice;
    int width;
    int height;
    double base;
    int area;
    int distance;
        cout << "What is the area of a square, triangle, rectangle, or circle?" ;

    // Display Choice
        cout << SQUARE << " = Square:  " << endl;
        cout << TRIANGLE << " = Triangle:  " << endl;
        cout << RECTANGLE << " = Rectangle: " << endl;
        cout << CIRCLE << " = Circle:  "  << endl;
        cout << "Make your choice? ";
        cin >> choice ;

        // Display Proper feedback based on users choice
        switch (choice)
        {
            case SQUARE:
        // Get Square information
            cout << "Enter the width of the square: " << endl;
            cin >> width;
            cin >> width;
            area = width * width;
            cout << "The area of the square is: " << area << endl;
                break;
            case TRIANGLE:
        // Get Triangle information
                cout << "Enter the base: " << endl ;
                cin >> base;
                cout << "Enter the height: " << endl ;
                cin >> height;
                area = (base * 2) * height;
                cout << "The area of a triangle is " << area << endl;
                break;
            case RECTANGLE:
        //Get the Rectangle inforamtion
                cout <<"Enter the height: " << endl;
                cin >> height;
                cout << "Enter the width: " << endl;
                cin >> width;
                area = height * width;
                cout << "The area of a rectancle is: " << area << endl;
                break;
            case CIRCLE:
        //Get the circle circumference
                cout << "Enter the distance: " << endl;
                cin >> distance;
                area = distance * 3.14;
                cout << "The circumference of a circle is: " << area << endl;
                break;
        }
system("pause");
return 0;

}

推荐答案

您需要更好地了解如何使用if和else.请看下面的代码片段:

You need to better understand how to use if and else. Look at the code snippet below:

if (mychoice == square)
{
   // Work with square
}
else if (mychoice == rectangle)
{
   // Work with rectangle
}
else
{
   // Not a square nor a rectangle...
}

您有两次else (mychoice == XXX)，确定编译器可以理解该构造吗?

You have twice else (mychoice == XXX), are you sure your compiler can understand that construct?

else (mychoice == rectangle){ // AT THIS POINT THERE IS AN ERROR THAT SAYS EXPECTED ; WHY IS THAT?

如果我是C ++编译器，我会期望else; (mychoice == rectangle).你知道为什么吗?

欢呼声，
AR

OP:不，我不能解释这个问题

1.阅读文章控制结构
[ ^ ]从顶部到 迭代结构(循环) .

2.再次阅读:)寻找句子:如果(条件)statement1 else statement2 .

3.在您的代码中找到:

If I was a C++ compiler I would expect else; (mychoice == rectangle). Do you understand why?

cheers,
AR

OP: no I do not can you explain this

1. Read the article Control Structures
[^] from top to Iteration structures (loops).

2. Read it again :) looking for the sentence : if (condition) statement1 else statement2.

3. In your code find:

if (mychoice == square){			
    cout << "Enter the width: ";			
    cin >> width;			
    cout << width * 2; 		
}		
else (mychoice == rectangle)

4.从此代码中，在 if(条件)statement1 else statement2 中确定与 condition ， statement1 和 statement2 匹配的部分. >.

5. (mychoice == rectangle)是声明吗?

6.编译器在else之后找到丢失的语句，并建议;最简单，最短的语句.

您应该在else (mychoice == rectangle)中插入什么以使编译器满意?

4. From this code identify the parts matching condition, statement1, and statement2 in if (condition) statement1 else statement2.

5. Is (mychoice == rectangle) a statement?

6. The compiler finds a missing statement after else and suggests ; the simplest and shortest possible statement.

What should you insert in else (mychoice == rectangle) to make your compiler happy?

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