vector_len

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <malloc.h>
#include<math.h>
struct vector_type
{
    double x_start = 0, y_start = 0, x_end = 0, y_end = 0, length = 0;
};

double get_length_x(double x_s, double x_en)
{
    return x_en - x_s;
}

double get_length_y(double y_s, double y_en)
{
    return y_en - y_s;
}

double get_length(double x, double y)
{
    return sqrt(x*x + y*y);
}

int main()
{
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    int num;
    double temp_len_X, temp_len_Y;
    scanf("%d", &num);
    struct vector_type *vector_arr = (struct vector_type*)malloc(sizeof(struct vector_type) * num);
    for (int i = 0; i < num; i++)
    {
        scanf("%lf%lf%lf%lf", &vector_arr[i].x_start, &vector_arr[i].y_start, &vector_arr[i].x_end, &vector_arr[i].y_end);
        temp_len_X = get_length_x(vector_arr[i].x_start, vector_arr[i].x_end);
        temp_len_Y = get_length_y(vector_arr[i].y_start, vector_arr[i].y_end);
        vector_arr[i].length = get_length(temp_len_X, temp_len_Y);
        printf("%lf", vector_arr[i].length);
    }

    return 0;
}