用的结构体为啥不对呀，输出直接nan了，求大佬们调调

#include<bits/stdc++.h>
using namespace std;
struct zb{
    int x,y;
};
int main(){
    struct zb dian[3];
    float d[3],sum=0;
    for(int i=0;i<3;i++){
        cin>>dian[i].x>>dian[i].y;
    }
    d[0]=sqrt((dian[0].x-dian[1].x)^2+(dian[0].y-dian[1].y)^2);
    d[1]=sqrt(((dian[0].x-dian[2].x)^2)+((dian[0].y-dian[2].y)^2));
    d[2]=sqrt(((dian[1].x-dian[2].x)^2)+((dian[1].y-dian[2].y)^2));
    for(int j=0;j<3;j++){
        sum=sum+d[j];
    }
    printf("%.2lf",sum);
    return 0;
}