#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <complex.h>
#ifdef complex
#undef complex
#endif
#ifdef I
#undef I
#endif


#if defined(_WIN64)
typedef long long BLASLONG;
typedef unsigned long long BLASULONG;
#else
typedef long BLASLONG;
typedef unsigned long BLASULONG;
#endif

/* generate a function to compute BMI status of a person based on their height and weight in SI units */       
int bmi(double height, double weight) {
    double bmi = weight / (height * height);
    if (bmi < 18.5) {
        return 0;
    } else if (bmi < 25.0) {
        return 1;
    } else if (bmi < 30.0) {
        return 2;
    } else {
        return 3;
    }
}

/* generate a function to collect height & weight in SI units from the user */
int collect_height_weight(double *height, double *weight) {
    printf("Enter height in meters: ");
    scanf("%lf", height);
    printf("Enter weight in kg: ");
    scanf("%lf", weight);
    return 0;
}

/* generate function to convert BMI status to human friendly format */
int status_readable(int status) {
    if (status == 0) {
        printf("Underweight\n");
    } else if (status == 1) {
        printf("Normal\n");
    } else if (status == 2) {
        printf("Overweight\n");
    } else if (status == 3) {
        printf("Obese\n");
    }
    return 0;
}

/* main function */
int main() {
    double height, weight;
    int status;
    collect_height_weight(&height, &weight);
    status = bmi(height, weight);
    status_readable(status);
    return 0;
}

/*
    $cc -o bmi bmi.c
    $./bmi
    Enter height in meters: 1.73
    Enter weight in kg: 66
    Normal
*/