Chapter 2 Exercises

//Chapter 2 exercises
//This program runs exercises 2.16 - 2.20, 2.28 and 2.30 in order
#include <iostream>
using namespace std;

double num1{0.0}, num2{0.0}, num3{0.0};

//exercise 2.16
//This program performs basic arithmetic operations on two numbers
int arithmetic(double num1, double num2){
    cout << "Exercise 2.16\n" "Please input two numbers to calculate: " << endl;
    cin >> num1 >> num2;
    cout << num1 << " + " << num2 << " = " << num1 + num2 << endl;
    cout << num1 << " x " << num2 << " = " << num1 * num2 << endl;
    cout << num1 << " - " << num2 << " = " << num1 - num2 << endl;
    cout << num1 << " / " << num2 << " = " << num1 / num2 << endl;

}

//Exercise 2.17
//This program displays "1 2 3 4" in three different ways
int displayNumbers(){
    cout << "Exercise 2.17\n" "1 2 3 4" << endl;
    cout << "1 " << "2 " << "3 " << "4" << endl;
    cout << "1 ";
    cout << "2 ";
    cout << "3 ";
    cout << "4" << endl;
}

//Exercise 2.18
//This program accepts two numbers and shows the user
//which is larger or if they are equal
int largerOrEqual(double num1, double num2) {
    cout << "Exercise 2.18\n" "Please enter two numbers to compare:" << endl;
    cin >> num1 >> num2;
    if (num1 == num2){
        cout << "These numbers are equal" << endl;
    }
    if(num1 > num2){
        cout << num1 << " is larger";
    }
    if (num1 < num2){
        cout << num2 << " is larger";
    }

}

//Exercise 2.19
//This program performs basic arithmetic, and comparison on three numbers
int compareAndCalculate(double num1, double num2, double num3) {
    cout << "Exercise 2.19\n" "Input three different integers: " << endl;
    cin >> num1 >> num2 >> num3;
    cout << "Sum is " << num1 + num2 + num3 << endl;
    cout << "Average is " << (num1 + num2 + num3) / 3 << endl;
    cout << "Product is " << num1 * num2 * num3 << endl;

    if (num1 > num2 && num2 > num3){
        cout << "Largest is " << num1 << endl;
        cout << "Smallest is " << num3 << endl;
    }
    if (num1 > num3 && num3 > num2) {
        cout << "Largest is " << num1 << endl;
        cout << "Smallest is " << num2 << endl;
    }
    if (num2 > num1 && num1 > num3) {
        cout << "Largest is " << num2 << endl;
        cout << "Smallest is " << num3 << endl;
    }
    if (num2 > num3 && num3 > num1) {
        cout << "Largest is " << num2 << endl;
        cout << "Smallest is " << num1 << endl;
    }
    if (num3 > num2 && num2 > num1) {
        cout << "Largest is " << num3 << endl;
        cout << "Smallest is " << num1 << endl;
    }
    if (num3 > num1 && num1 > num2) {
        cout << "Largest is " << num3 << endl;
        cout << "Smallest is " << num2 << endl;
    }
}

//Exercise 2.20
//This program accepts a radius of a circle
//and prints the diameter, circumference, and area
int circleDimensions() {
    int radius{};
    cout << "Exercise 2.20\n" "Please input the radius of your circle: " << endl;
    cin >> radius;
    cout << "Diameter is " << radius * 2 << endl;
    cout << "Circumference is " << 2 * 3.14159 * radius << endl;
    cout << "Area is " << 3.14159 * radius * radius << endl;

}

//Exercise 2.28
//This program accepts a five digit number and prints that number with spaces
int splitFiveDigits(int num1) {
    cout << "Exercise 2.28\n" "Please input a five digit number: " << endl;
    cin >> num1 ;
    cout << num1 / 10000 << " " << num1 % 10000 / 1000 << " "
    << num1 % 10000 % 1000 / 100 << " " << num1 % 10000 % 1000 % 100 / 10
    << " " << num1 % 10000 % 1000 % 100 % 10 << endl;

}
//Exercise 2.30
//This program accepts weight and height, and calculates BMI
int BMI(){
    double height{}, weight{};
    cout << "Exercise 2.30\n" "Please input your height in inches and weight in pounds: " << endl;
    cin >> height >> weight;
    cout << "Your BMI is " << (weight * 703) / (height * height) << endl;
    cout << "\n" "BMI VALUES\n"
    "Underweight:\t less than 18.5\n"
    "Normal:\t\t between 18.5 and 24.9\n"
    "Overweight:\t between 25 and 29.9\n"
    "Obese:\t\t 30 or greater" << endl;
}

int main() {
    arithmetic(num1, num2);
    cout << "\n";
    displayNumbers();
    cout << "\n";
    largerOrEqual(num1, num2);
    cout << "\n" << endl;
    compareAndCalculate(num1, num2, num3);
    cout << "\n";
    circleDimensions();
    cout << "\n";
    splitFiveDigits(num1);
    cout << "\n";
    BMI();
}