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@jesushilarioh
jesushilarioh committed Feb 10, 2019
1 parent 4992665 commit 58bc7e8
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40 changes: 16 additions & 24 deletions Chapter-4-Making-Decisions/Review Questions and Exercises/Programming Challenges/18.cpp
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Expand Up @@ -20,35 +20,32 @@
* calories or fat grams were incorrectly entered.
*
* Jesus Hilario Hernandez
* February 20, 2018
* February 10, 2019
*
********************************************************************/
#include <iostream>
using namespace std;
int main()
{
// Varibles
float cal_from_fat,
float calories_from_fat,
fat_grams,
per_of_cal,
total_cal;
percentage_of_calories,
total_calories;

// Ask for the number of calories & fat grams in food
cout << "\nEnter number of calories: ";
cin >> total_cal;
cin >> total_calories;

if (total_cal > 0)
if (total_calories > 0)
{
cout << "Enter number of fat grams: ";
cin >> fat_grams;

if (fat_grams > 0)
{
// Calculate
cal_from_fat = fat_grams * 9;
per_of_cal = (cal_from_fat / total_cal) * 100;

if (cal_from_fat > total_cal)
calories_from_fat = fat_grams * 9;
percentage_of_calories = (calories_from_fat / total_calories) * 100; // .45 == 45

if (calories_from_fat > total_calories)
{
cout << "\nCalories from fat cannot be greater\n";
cout << "then the total number of calories." << endl;
Expand All @@ -58,30 +55,25 @@ int main()
}
else
{
// Display the % of calories from fat
cout << "Total calories = " << total_cal << " cal"<< endl;
cout << "Total calories = " << total_calories << " cal"<< endl;
cout << "Total fat grams = " << fat_grams << " g" << endl;
cout << "Total calories from fat = " << cal_from_fat << " cal from fat"<< endl;
cout << "Total percentage of calories from fat = " << per_of_cal << '%' << endl;
cout << "Total calories from fat = " << calories_from_fat << " cal from fat"<< endl;
cout << "Total percentage of calories from fat = " << percentage_of_calories << '%' << endl;
cout << endl;
}
}
else
{
// Explain error and try again
cout << "We're sorry. Total fat grams must be more than 0.\n";
cout << "We're sorry. Fat grams must be more than 0.\n";
cout << "Please rerun the progarm and try again." << endl;
}
}
else
{
// Explain error and try again
cout << "We're sorry. Total calories must be more than 0.\n";
cout << "Please rerun the progarm and try again." << endl;
}


// If calories from fat are less than 30%, display "food is low in fat"

// Terminate program
return 0;
}
}
13 changes: 5 additions & 8 deletions Chapter-4-Making-Decisions/Review Questions and Exercises/Programming Challenges/19.cpp
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Expand Up @@ -17,13 +17,11 @@
using namespace std;
int main()
{
// Variables
double wavelength;
// Ask for wavelength (in meters)
cout << "/nEnter wavelength (in meters): ";
cin >> wavelength;

// Display the type of wave according to chart
cout << "\nEnter wavelength (in meters): ";
cin >> wavelength; // .0001

if (wavelength >= 1E-2)
cout << "Radio Waves" << endl;
else if (wavelength <= 1E-2 && wavelength >= 1E-3)
Expand All @@ -39,8 +37,7 @@ int main()
else if (wavelength <= 1E-11)
cout << "Gamma Rays" << endl;

// Format line break
cout << endl;
// Terminate program

return 0;
}
}
50 changes: 27 additions & 23 deletions Chapter-4-Making-Decisions/Review Questions and Exercises/Programming Challenges/20.cpp
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Expand Up @@ -23,76 +23,80 @@
* distances less than 0.
*
* Jesus Hilario Hernandez
* February 21, 2018
* February 21, 2019
*
********************************************************************/
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
// Variables
int user_select;
const int AIR_FEET_PER_SECOND = 1100,
WATER_FEET_PER_SECOND = 4900,
STEEL_FEET_PER_SECOND = 16400,
MINIMUM_DISTANCE = 0;

int user_menu_choice;

float length_of_travel,
amount_of_time;

// Display menu
// Ask user to select from menu
cout << "===================" << endl;
cout << " Choose one: " << endl;
cout << "-------------------" << endl;
cout << " 1. Air " << endl;
cout << " 2. Water " << endl;
cout << " 3. Steel " << endl;
cout << "===================" << endl;
cin >> user_select;
cin >> user_menu_choice;

// Decision statement
switch (user_select)
switch (user_menu_choice)
{
case 1:
case 2:
case 3:
// Ask user to enter the distance sound wave will travel
cout << "\nHow far will the sound wave travel? ";
cin >> length_of_travel;

// If less that 0, error check
if (length_of_travel < 0)
if (length_of_travel < MINIMUM_DISTANCE)
{
cout << "\nWe're sorry. Distance must be more than 0.\n";
cout << "\nError. Distance must be more than 0.\n";
cout << "Rerun the program and try again.\n" << endl;
}
else
{
if (user_select == 1)
// Valid
if (user_menu_choice == 1)
{
amount_of_time = length_of_travel / 1100;
amount_of_time = length_of_travel /
AIR_FEET_PER_SECOND;
cout << "In air ";

}
else if (user_select == 2)
else if (user_menu_choice == 2)
{
amount_of_time = length_of_travel / 4900;
amount_of_time = length_of_travel /
WATER_FEET_PER_SECOND;
cout << "In water ";
}
else if (user_select == 3)
else if (user_menu_choice == 3)
{
amount_of_time = length_of_travel / 16400;
amount_of_time = length_of_travel /
STEEL_FEET_PER_SECOND;
cout << "In steel ";
}

// Display amount of time it will take
cout << setprecision(4) << fixed;
cout << "the sound wave will take " << amount_of_time;
cout << " seconds to travel." << endl << endl;
}
break;

default:
cout << "\nWe're sorry. Choose a number between 1 and 3." << endl;
cout << "Rerun the program and try again.\n" << endl;
break;
}

// Terminate program

return 0;
}
}
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