Xcode8 - 程序未正确执行

在使用Xcode8时说它正在运行但没有输出。

输出：

10

请输入矩形的长度：

10

请输入矩形的宽度：

矩形的长度为 10.00

矩形的宽度为 10.00

矩形的面积为 100.00

圆的半径为 10.00

圆的面积是 314.16

程序以退出代码结束：0

想要的输出：

请输入矩形的长度：10

请输入矩形的宽度：10

矩形的长度为 10.00

矩形的宽度为 10.00

矩形的面积为 100.00

圆的半径为 10.00

圆的面积是 314.16

程序以退出代码结束：0

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
// Function prototypes
double getLength(); // Function that receives the length
double getWidth(); // Function that receives the width
double getArea(double); //Function calculates area for circle
double getArea(double,double); // Function calculates area for rectangle
void displayData(double,double,double,double, double);
// displayData function is used to display values
int main() {
    // Declares variables
    double length, width, circleArea, rectangleArea;
    length = getLength(); // Stores length
    width = getWidth(); // Stores width
    circleArea = getArea(width); // Stores area of circle
    rectangleArea = getArea(width, length); // Stores are of rectangle
    // Displays the length, width, area of circle, and rectangle area
    displayData(length, width, rectangleArea, width, circleArea);
    return 0;
}
/* This function asks the user to enter the rectangle's length and
 then returns that values as a double */
double getLength() {
    double length;
    cout << "Please enter the rectangle's length: ";
    cin >> length; // User input is stored in variable length
    cout << "n";
    /* While loop doesn't let user input a
    negative value or a value of zero for 
    the length of the rectangle. */
    while (length <= 0) {
        if (length < 0) { //if statement used when a negative value is entered for length
            cout << "INVALID INPUT!" << endl; // Error message
            cout << "Please enter a positive value for the Length of the Rectangle: ";
            // Asks the user to enter the length again
            cin >> length; // Stores value of length
            if (length > 0) {
                cout << "n";
            }
        }
        if (length == 0) { // If statement used when a value of zero is entered for length
            cout << "INVALID INPUT!" << endl;//error message
            cout << "Please enter a positive value for the Length of the Rectangle: ";
            // Asks the user to enter the length again
            cin >> length;// Stores the value of length
            if (length > 0) {
                cout << "n";
            }
        }
    }
    return length;
}
/* This function asks the user to enter the rectangle's width and
 then returns that values as a double */
double getWidth() {
    double width;
    cout << "Please enter the rectangle's width: ";
    cin >> width; // User input is stored in variable width
    cout << "n";
    /* While loop doesn't let user input a
     negative value or a value of zero for the
     width of the rectangle. */
    while (width <= 0) {
        if (width < 0) { // If statement used when a negative value is entered for width
            cout << "INVALID INPUT!" << endl; // Error message
            cout << "Please enter a positive value for the Width of the Rectangle: ";
            // Asks the user to enter the width again
            cin >> width; //Stores the value of width in the variable, width
            if (width > 0) {
                cout << "n";
            }
        }
        if (width == 0) { // If statement used when a value of zero is entered for width
            cout << "INVALID INPUT!" << endl; // Error message
            cout << "Please enter a positive value for the Width of the Rectangle: ";
            // Asks the user to enter the width again
            cin >> width; // Stores the value of width in the variable, width
            if (width > 0)
            {
                cout << "n";
            }
        }
    }

    return width;
}
double getArea(double radius) {
    const double PI = 3.14159;
    double circleArea;
    circleArea = PI * pow(radius, 2); // Formula for the area of a circle
    return circleArea;
}
/* This function accepts the rectangle's length and width as arguments and returns
 the rectangle's area. The area is calculated by multiplying the length by the
 width. */
double getArea(double length, double width) {
    double rectangleArea;
    rectangleArea = length * width; // Formula for the area of a rectangle
    return rectangleArea;
}
/* This function accepts the rectangle's length, width, and area as arguments
 and displays them in an appropriate message on the screen */
void displayData(double l, double w, double ra, double r, double ca) {
    cout << setprecision(2) << fixed;
    cout << "The length for the rectangle is " << l << endl;
    cout << "The width for the rectangle is " << w << endl;
    cout << "The area for a rectangle is " << ra << endl << endl;
    cout << "The radius for the circle is " << r << endl;
    cout << "The area for the circle is " << ca << endl;
}

cout << "Please enter the rectangle's length: " << flush;