我环顾四周，仍然找不到任何可以帮助我的东西！我编写了一个程序来使用它们的纬度和经度计算两个城市之间的距离，城市的详细信息保存在一个文件中，然后在我的程序中加载到 BST 中！到目前为止，一切正常，除了当我运行假设计算距离的代码时，我得到每个城市的相同答案！我不太确定为什么我在每个城市都得到相同的答案！请帮我指出正确的方向？
这是计算距离的代码
#include <cmath>
#define pi 3.14159265358979323846
string userResponse;
float globalLat1, globalLon1, globalLat2, globalLon2;
for(int j= 0; j < 2; j++){
string whatever;
if (j==0){
bool hasbeenfound = false;
do{
//ask the user to enter their first city of their choice
whatever = "first ";
cout << "Enter your " + whatever + "City" << endl;
cout << "-------------------" << endl;
cin >> userResponse;
cout << endl;
if (Cities->search(userResponse)) //check if the entered city already exist
{
hasbeenfound = true;
}
else{
cout << "City not Found" << endl;
cout << endl;
}
//globalCity1 = Cities->sRootName;
globalLat1 = Cities->sLatitude;
globalLon1 = Cities->sLongitude;
}
while(hasbeenfound == false); //while the entered city hasn't been found, repeat the process
}else
{
bool hasbeenfound = false;
do{
//ask the user to enter their second city of their choice
whatever = "second ";
cout << endl;
cout << "Enter your " + whatever + "City" << endl;
cout << "-------------------" << endl;
cin >> userResponse;
cout << endl;
if (Cities->search(userResponse)) //check if the entered city already exist
{
hasbeenfound = true;
}
else{
cout << "City not Found" << endl;
}
//globalCity2 = Cities->sRootName;
globalLat2 = Cities->sLatitude;
globalLon2 = Cities->sLongitude;
}
while(hasbeenfound == false); //while the entered city hasn't been found, repeat the process
}
}
// This function converts decimal degrees to radians
double deg2rad(double deg) {
return (deg * pi / 180);
};
// This function converts radians to decimal degrees
double rad2deg(double rad) {
return (rad * 180 / pi);
};
//distance calculations
cout << endl;
distan = sin(globalLat1)) * sin(deg2rad(globalLat2)) + cos(deg2rad(globalLat1)) * cos(deg2rad(globalLat2)) * cos(globalLon2 - globalLon1);
distan = rad2deg(distan);
distan = distan * 60 * 1.1515;
distan = (6371 * pi * distan)/180;
cout << "The Distance between the to cities is: " << distan << " kilometers" << endl;
