#include<stdio.h>

typedef struct{
        int x;
        int y;
}       point;

typedef struct{
        point UL;
        point DR;
} box;

#if 0
int onko_sisalla(const box *loota, const point *piste)
/* Palauttaa 0 jos sis„ll„ */
{
   if (loota->UL.x <= piste->x && piste->x <= loota->DR.x  &&
       loota->UL.y <= piste->y && piste->y <= loota->DR.y ) return 1;
   return 0;
}

#else
int onko_sisalla(const box *loota, const point *piste)
/* Palauttaa 0 jos sis„ll„ */
{
   if ( piste->x    < loota->UL.x ) return 0;
   if ( loota->DR.x < piste->x    ) return 0;
   if ( piste->y    < loota->UL.y ) return 0;
   if ( loota->DR.y < loota->UL.y ) return 0;
   return 1;
}
#endif

/*  FILE *f;  if ( f = fopen('kissa.txt',"rt") && fgets(f,s,10) ) */

int main(void){
    box bx= { {20,20},{40,40} };
    point p = {21,19};
    if ( onko_sisalla(&bx,&p) ) printf("On sisalla");
    return 0;
}