edaBit-coding-challenges/Body-Mass-Index/code.cpp

/*  Body Mass Index (BMI) is found by taking your weight
 *  in kilograms and dividing by the square of your height in meters. 
 *  The BMI categories are:
 *  Underweight: <18.5
 *  Normal weight: 18.5–24.9
 *  Overweight: 25–29.9
 *  Obesity: BMI of 30 or greater
 *  Create a function that will accept weight and height
 *  (in kilos, pounds, meters, or inches) and return the BMI 
 *  and the associated category. Round the BMI to nearest tenth.
 *  1 inch = .0254 meter
 *  1 pound = 0.453592 kilo
 */
#include <cmath>
#include <iomanip>
std::string BMI(std::string weight, std::string height) {
	//  stoi weight & height to isolate integers
	float w = std::stof(weight /*size_t* idx = 0, int base = 10*/);
	float h = std::stof(height);
	//  find pounds or feet to determine if a conversion needs to happen
	if(std::string::npos != weight.find("pounds")){
		w = w *  0.453592;
	}
	if(std::string::npos != height.find("inches")){
		h = h * .0254;
	}
	//  bmi is weight in kilograms and dividing by the square of your height in meters
	std::string bmi = std::to_string(round(10*(w/(h*h)))/10);
	// find decimal point position
	int pos = bmi.find(".");
	// substring decimal location  + 1
	bmi = bmi.substr(0,pos+2);
	float bmiFloat = round(10*(w/(h*h)))/10;
	if(18.5>bmiFloat){
		return bmi + " Underweight";
	}
	if(24.9>=bmiFloat){
		return bmi + " Normal weight";	
	}
	if(29.9>=bmiFloat){
		return bmi + " Overweight";
	}
	if(30<=bmiFloat){
		return bmi + " Obesity";
	}
	
}