全部点错，为什么啊？

#include<iostream>
#include<cmath>
using namespace std;
int dis(int e, int d);

int main()
{
    double x1, x2, x3, y4, y2, y3;
    cin >> x1 >> y4;
    cin >> x2 >> y2;
    cin >> x3 >> y3;
    double X1 = abs(x1 - x2);
    double X2 = abs(x1 - x3);
    double X3 = abs(x2 - x3);
    double Y1 = abs(y4 - y2);
    double Y2 = abs(y4 - y3);
    double Y3 = abs(y2 - y3);
    double c1, c2, c3, c4;
    c1 = dis(X1, Y1);
    c2 = dis(X2, Y2);
    c3 = dis(X3, Y3);

    c4 = c1 + c2 + c3;

    printf("%.2lf", c4);

    return 0;
}
int dis(int e,int d)
{
    int c;
    c = sqrt((e * e) + (d * d));

        return c;
}