// Using array<T,N> to create Body Mass Index (BMI) table

// BMI = weight/(height*height)

// weight in kilograms, height in meters

import <iostream>;

import <format>;

import <array>; // For array<T,N>

int main()

{

const unsigned min_wt {100}; // Minimum weight in table (in pounds)

const unsigned max_wt {250}; // Maximum weight in table

const unsigned wt_step {10};

const size_t wt_count {1 + (max_wt - min_wt) / wt_step};

const unsigned min_ht {48}; // Minimum height in table (inches)

const unsigned max_ht {84}; // Maximum height in table

const unsigned ht_step {2};

const size_t ht_count { 1 + (max_ht - min_ht) / ht_step };

const double lbs_per_kg {2.2}; // Pounds per kilogram

const double ins_per_m {39.37}; // Inches per meter

std::array<unsigned, wt_count> weight_lbs {};

std::array<unsigned, ht_count> height_ins {};

// Create weights from 100lbs in steps of 10lbs

for (unsigned i{}, w{ min_wt }; i < wt_count; w += wt_step, ++i)

{

weight_lbs[i] = w;

}

// Create heights from 48 inches in steps of 2 inches

for (unsigned i{}, h{ min_ht }; h <= max_ht; h += ht_step)

{

height_ins.at(i++) = h;

}

// Output table headings

std::cout << std::format("{:>8}", '|');

for (auto w : weight_lbs)

std::cout << std::format("{:^6}|", w);

std::cout << std::endl;

// Output line below headings

for (unsigned i{1}; i < wt_count; ++i)

std::cout << "--------";

std::cout << std::endl;

const unsigned int inches_per_foot {12U};

for (auto h : height_ins)

{

const unsigned feet{ h / inches_per_foot };

const unsigned inches{ h % inches_per_foot };

std::cout << std::format("{:2}'{:2}\" |", feet, inches);

const double h_m{ h / ins_per_m }; // Height in meter

for (auto w : weight_lbs)

{

const double w_kg = w / lbs_per_kg; // Weight in kilogram

const double bmi = w_kg / (h_m * h_m);

std::cout << std::format(" {:2.1f} |", bmi);

}

std::cout << std::endl;

}

// Output line below table

for (size_t i {1}; i < wt_count; ++i)

std::cout << "--------";

std::cout << "\nBMI from 18.5 to 24.9 is normal" << std::endl;

}