问题描述
人们提到我的问题不够明确，所以希望能让每个人都更容易重组它。
以下代码用于打印一个函数，该函数创建一个由'*'组成的箭头，例如：
1 .__ *
2 ._ * * *
3. * * * * *
4 .__ *
5 .__ *
6 .__ *
但是，我的箭头必须根据用户输入计算。箭头的参数必须采用：箭头的宽度，尾部的宽度，箭头从尾部到点的长度以及用于绘制箭头的字符（在本例中为*）
请查看代码，然后在下面我将发布我在尝试进入调试模式时收到的错误。随着人们的建议，我会更新代码。另请注意我不是C ++的专家，这是我的第一个任务。所以，如果你能为我拼出一切，就像你想要在初学者时解释一样。谢谢
People are mentioning that my question isn't clear enough so hopefully to make it easier for everyone I'm going to restructure it.
The code below is designed to print a function that creates an arrow made out of '*' for example:
1.__*
2._* * *
3.* * * * *
4.__ *
5.__ *
6.__ *
However, my arrow must be calculated from user input. The arguments of the arrow must take: The width of the arrow head, the width of the tail, length of the arrow from tail to point and the character used to draw the arrow (in this case '*')
Please take a look at the code, and then below I will post the errors I'm receiving when I try entering debug mode. I will update the code as I go along with peoples advice. Also please note I'm not an expert with C++, this is really my first task. So if you could please spell everything out for me as you would want it explained when you were a beginner. Thank you
// program to run an arrow function
// Author: Douglas Tyler
// Date: 30.10.2014
// Edited: 06.11.2014
#include <iostream>
#include <sstream>
using namespace std;
void draw_arrow(int width, int tail, int length, char draw){
for (int i = 1; i <= width; i += 2){ //print Head width
for (int j = 0; j<(width - i) / 2; j++) //print Tail width
std::cout << " "; // print space
for (int j = 0; j<(length - i) / 2; j++); // print length
std::cout << " "; // print space
for (int j = 0; j std::cout << draw;
std::cout << "\n";
}
//print tail
for (int i = 0; i < width / 2; i++){
for (int j = 0; j<(width - tail) / 2; j++)
std::cout << " ";
for (int j = 0; j<tail;> std::cout << draw;
std::cout << std::endl;
}
}
int main() // main function
{
cout << "Welcome to printArrow" << endl;
cin >> " " >> endl;
int width_of_arrow = 0;
int width_of_tail = -1;
int length_of_arrow = 0;
char drawing_char = '\0';
std::string input;
std::cout << "Please input the Width of the Arrow head: "; // ask the user to input arrow head width information
std::getline(std::cin, input);
std::stringstream(input) >> width_of_arrow;
std::cout << "Please input the Width of the Tail: 1";
std::getline(std::cin, input);
std::stringstream(input) >> width_of_tail;
if (width_of_tail == -1) width_of_tail = 1;
std::cout << "Please input the length of the Arrow: ";
std::getline(std::cin, input);
std::stringstream(input) >> length_of_arrow;
if (length_of_arrow == -2) length_of_tail = 2;
std::cout << "Input Drawing Character: *";
std::getline(std::cin, input);
drawing_char = input[0];
if (drawing_char == '\0') drawing_char = '*';
draw_arrow(width_of_arrow, width_of_tail, length_of_arrow, drawing_char);
return 0;
}
错误1错误C2086：'std :: string input'：重新定义
错误2错误C2065：'length_of_arrow' ：未声明的标识符
错误3错误C2065：'length_of_arrow'：未声明的标识符
错误4错误C2065：'length_of_arrow'：未声明的标识符
错误5智能感知：标识符length_of_arrow未定义
这对你们中的一些人来说可能看起来很简单，但对我来说不是这样，所以我感谢你的理解。谢谢你任何帮助你可以给
Error 1 error C2086: 'std::string input' : redefinition
Error 2 error C2065: 'length_of_arrow' : undeclared identifier
Error 3 error C2065: 'length_of_arrow' : undeclared identifier
Error 4 error C2065: 'length_of_arrow' : undeclared identifier
Error 5 IntelliSense: identifier "length_of_arrow" is undefined"
This may seem simple to some of you but it isn't to me so I appreciate you being understanding. Thank you for any help you can give
推荐答案
void draw_arrow(int width, int tail, char draw, int length){
Line 62: draw_arrow(width_of_arrow, width_of_tail, drawing_char);
对我来说显而易见。
Seems obvious to me.
// program to run an arrow function
// Author: Douglas Tyler
// Date: 30.10.2014
// Edited: 06.11.2014
#include <iostream>
using namespace std;
void draw_arrow(int width, int tail, int length, char draw)
{
for (int i = 1; i <= width; i += 2)
{
//print Head width
for (int j = 0; j < (width - i) / 2; j++) //print Tail width
cout << " "; // print space
for (int j = 0; j < (length - i) / 2; j++) // print length
cout << " "; // print space
for (int j = 0; j < (width - i) / 2; j++) // not sure what you want here
cout << draw;
cout << endl;
}
//print tail
for (int i = 0; i < width / 2; i++)
{
for (int j = 0; j < (width - tail) / 2; j++)
cout << " ";
for (int j = 0; j < tail;) // not sure about this either
cout << draw;
cout << endl;
}
}
int main() // main function
{
int width_of_arrow = 0;
int width_of_tail = -1;
int length_of_arrow = 0;
char drawing_char = '\0';
cout << "Welcome to printArrow" << endl;
cout << "Please input the Width of the Arrow head: "; // ask the user to input arrow head width information
cin >> width_of_arrow;
std::cout << "Please input the Width of the Tail: 1 ";
cin >> width_of_tail;
if (width_of_tail == -1)
width_of_tail = 1;
cout << "Please input the length of the Arrow: 2 ";
cin >> length_of_arrow;
if (length_of_arrow == -2)
length_of_arrow = 2;
cout << "Input Drawing Character: * ";
cin >> drawing_char;
if (drawing_char == '\0')
drawing_char = '*';
draw_arrow(width_of_arrow, width_of_tail, length_of_arrow, drawing_char);
return 0;
}
</iostream>
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