Xcode8-程序执行不正确 [英] Xcode8 - Program is not executing correctly
问题描述
虽然使用Xcode8表示它正在运行，但是没有输出.
While using Xcode8 says that it is running but there is no output.
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
The length for the rectangle is 10.00
矩形的宽度是10.00
The width for the rectangel is 10.00
矩形的面积为100.00
The area for a rectangle is 100.00
圆的半径为10.00
The radius for a circle is 10.00
一个圆圈的面积是314.16
The area for a circle is 314.16
程序以退出代码0结束
想要的输出:
请输入矩形的长度:10
Please enter the rectangle's length: 10
请输入矩形的宽度:10
Please enter the rectangle's width: 10
矩形的长度为10.00
The length for the rectangle is 10.00
矩形的宽度是10.00
The width for the rectangel is 10.00
矩形的面积为100.00
The area for a rectangle is 100.00
圆的半径为10.00
The radius for a circle is 10.00
一个圆的面积是314.16
The area for a circle is 314.16
程序以退出代码0结束
#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;
}
推荐答案
将<<与cout一起使用时，它不会立即推送到屏幕.如您所示，发送输出的常见方法是endl.如果您不希望返回行，请使用flush.
When you use << with cout, it doesn't immediately push to the screen. A common way to send the output, as you've shown, is endl. If you don't want a line return, use flush.
cout << "Please enter the rectangle's length: " << flush;
Xcode 8.3似乎在同一行上有关于cin和cout的新规则.
Xcode 8.3 seems to have new rules about cin and cout on the same line.
这篇关于Xcode8-程序执行不正确的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
