#include <stdio.h>
#include <stdlib.h>
#include <time.h>

typedef struct {
    float x;    /* x */
    float y;    /* y */
} point;

point* random_point(){
    srand((unsigned) time(NULL));
    point* p = (point*)malloc(sizeof(point));
    float rnd;
    rnd = (rand() % 1001 - 500)/10.0;
    p->x = rnd;
    rnd = (rand() % 1001 - 500)/10.0;
    p->y = rnd;
    return p;
}

int main(void)
{
    point* p;
    p = random_point();
    printf("生成された座標： (%.1f,%.1f)\n", p->x, p->y);
    return 0;
}