C++創建一個半滿的矩形

Question

SO我已經創建，創建一個正方形或長方形的框架，我試圖得到它的正方形/長方形內輸出恆星的程序，所以它是半滿的，像這樣的：

******** 
** * * * 
* * * ** 
** * * * 
******** 

這裏是我到目前爲止的代碼：

void frameDisplay(int width, int height) { 
cout <<"What should the width be?\n"; 
cin >> width; 
cout <<"What should the height be?\n\n"; 
cin >> height; 
if(width < 2){ 
cout <<"Width must be greater than two.\n"; 
cout <<"What should the width be? \n"; 
cin >> width; 
}if(height < 2){ 
cout <<"Height must be greater than two.\n"; 
cout <<"What should the height be? \n"; 
cin >> height; 
} 
cout << string(width, '*') << endl; 
for(int j = 0; j < height - 2; ++j) 
cout << '*'<< string(width - 2, ' ')<< '*' << endl; 
cout << string(width, '*') << endl; 
} 
int main(){ 
    int width=0, height=0; 
    frameDisplay(width, height); 
} 

輸出：

What should the width be? 
5 
What should the height be? 

7 
***** 
* * 
* * 
* * 
* * 
* * 
***** 

Answer 1

我建議有點restruc的你的代碼的圖靈。

創建獨立的功能：

1. 接受用戶輸入。
2. 填寫框架數據在std::vector<std::vector<char>>。
3. 顯示幀數據。

然後從main調用它們。

#include <iostream> 
#include <vector> 
#include <utility> 

using namespace std; 

std::pair<int, int> getUserInput() 
{ 
    int width; 
    cout <<"What should the width be?\n"; 
    cin >> width; 

    int height; 
    cout <<"What should the height be?\n"; 
    cin >> height; 

    return std::make_pair(width, height); 
} 

void fillUpFrame(std::vector<std::vector<char>>& frameData) 
{ 
    // Add the logic to fill up the frame data. 
} 

對於displayFrame，如果你有一個C++編譯器11，可以使用：

void displayFrame(std::vector<std::vector<char>> const& frameData) 
{ 
    for (auto const& row : frameData) 
    { 
     for (auto cell : row) 
     { 
     cout << cell; 
     } 
     cout << endl; 
    } 
    cout << endl; 
} 

否則，使用：

void displayFrame(std::vector<std::vector<char>> const& frameData) 
{ 
    suze_t rows = frameData.size(); 
    for (size_t i = 0; i < rows; ++i) 
    { 
     size_t cols = frameData[i].size(); 
     for (size_t j = 0; j < cols; ++j) 
     { 
     int cell = frameData[i][j]; 
     cout << cell; 
     } 
     cout << endl; 
    } 
    cout << endl; 
} 

而且main：

int main(){ 

    // Get the user input. 
    std::pair<int, int> input = getUserInput(); 
    int width = input.first; 
    int height = input.second; 

    // Create a 2D vector to hold the data, with all the elements filled up 
    // with ' '. 
    std::vector<std::vector<char>> frameData(height, std::vector<char>(width, ' ')); 

    // Fill up the frame data. 
    fillUpFrame(frameData); 

    // Display the frame data 
    displayFrame(frameData); 

    return 0; 
}