当使用 std::CIN 输入结构时，它会出错

我想制作一个代码来计算三角形点坐标的三角形面积

当用户输入例如 1 的数字时，它会写入 -1.5458E+037

我尝试了一些小调整，例如使用std::但根本没有工作

TBH 我是 C++ 的新手，所以我可能没有得到一些东西，我要求彻底解释一些事情

#include<iostream>
#include<math.h>
//#define str string
//using namespace std
int inputStarted=1;//being used in inputCo function
struct cords{
float x;
float y;
};
float distance(cords a,cords b){
float distanceX;
float distanceY;
distanceX= (a.x-b.x)*(a.x-b.x);
distanceY= (a.y-b.y)*(a.y-b.y);
return sqrt(distanceX+distanceY);
}
void area(cords A, cords B, cords C){
float ab =distance(A,B); 
float ac =distance(A,C);
float bc =distance(B,C);
float S=(ab+ac+bc)/2;
float Area=sqrt(S*(S-ab)*(S-ac)*(S-bc));
std::cout<<Area;
}
void printCords(cords a){
std::cout<<std::endl<<std::endl<<"x - "<<a.x<<std::endl<<std::endl<<"y - "<<a.y<<std::endl<<std::endl;
}
void inputCo(cords a){
if(inputStarted==1){
std::cout<<"input your 1-st point's X position/coordinate  -  ";// = 1
std::cin>>a.x;
std::cout<<"input your 1-st point's Y position/coordinate  -  ";// = 4
std::cin>>a.y;
std::cout<<std::endl;
}
if(inputStarted==2){
std::cout<<"input your 2-nd point's X position/coordinate  -  ";// = 5
std::cin>>a.x;
std::cout<<"input your 2-nd point's Y position/coordinate  -  ";// = 8
std::cin>>a.y;
std::cout<<std::endl;
}
if(inputStarted==3){
std::cout<<"input your 3-rd point's X position/coordinate  -  ";// = 3
std::cin>>a.x;
std::cout<<"input your 3-rd point's Y position/coordinate  -  ";// = 6
std::cin>>a.y;
std::cout<<std::endl;
}
inputStarted++;
}
int main(){
cords A;
cords B;
cords C;
inputCo(A);
inputCo(B);
inputCo(C);
printCords(A);
printCords(B);
printCords(C);
area(A,B,C);    
}```