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Tired of Sudoku? C++ Programming is a great way to keep your
mind active and solve some calculations along the way. This
program determines the dimensions of a speaker enclosure based
on the volume the speaker needs. Plenty of STDs here (see code).
/* boxdimen3.cpp
This is a C++ program I completed on 27 April 2009.
The pgm computes the dimensions of a speaker box based on the volume required by
the speaker. The user inputs the volume in either cubic feet or cubic liters.
This pgm is an expanded version of a BASIC pgm found in David B Weems book "Designing,
Building, and Testing Your Own Speaker System" 4th ed, 1997, McGraw-Hill, Page 104. The
book had a printed copy of the C program, not a digital copy. The reader had to type in
the 38-line program. I chose to learn C++ and create this 300-line program.
*/
#include // needed for cout and cin
#include // needed to be able to use strings
#include // for pow(a, b) function (argument a raised to the power of argument b)
void DisplayConversionChoices(); // prototype for this function
int main() {
std::cout << "This program computes Speaker Box Dimensions. There are two sections: \n";
std::cout << " Section 1 provides various volume conversion calculations. \n";
std::cout << " Section 2 provides the dimensions for three speaker boxes (Normal, \n";
std::cout << " Fat, and Tall) based on the volume requirement you enter. \n";
std::cout << "\n"; // prints a blank line
float cu_ft_inp12; // four Calculation INPUT variables
float cu_in_inp3; //..
float cu_lt_inp45; //..
float cu_cm_inp6; //..
std::string conversion_from; // input of Cubic Feet, Cubic Liters, etc
std::string conversion_to; // output of Cubic Feet, Cubic Liters, etc
std::cout << "..............1. VOLUME CONVERSION SECTION..............\n";
DisplayConversionChoices();
char conversion_type = 0; // set to "0" to start with
char i_am_done = 'N'; // value used to end the while section
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
while (i_am_done == 'N') {
switch (conversion_type) {
case '1': // conversion_type = 1
conversion_from = "Cubic Feet";
conversion_to = "Cubic Liters.";
std::cout << "You chose type 1. Convert " << conversion_from << " to " << conversion_to << " \n";
std::cout << "\n"; // prints a blank line
std::cout << "Enter value for " << conversion_from << " and press Enter. ";
std::cin >> cu_ft_inp12;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
std::cout << "\n"; // prints a blank line
std::cout << " Here is the ANSWER: \n";
std::cout << " " << cu_ft_inp12 << " " << conversion_from << " equals "
<< ((cu_ft_inp12 * 28.31687)) << " " << conversion_to << " \n";
DisplayConversionChoices();
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
break;
case '2': // conversion_type = 2
conversion_from = "Cubic Feet";
conversion_to = "Cubic Inches.";
std::cout << "You chose type 2. Convert " << conversion_from << " to " << conversion_to << " \n";
std::cout << "\n"; // prints a blank line
std::cout << "Enter value for " << conversion_from << " and press Enter. ";
std::cin >> cu_ft_inp12;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
std::cout << "\n"; // prints a blank line
std::cout << " Here is the ANSWER: \n";
std::cout << " " << cu_ft_inp12 << " " << conversion_from << " equals "
<< ((cu_ft_inp12 * 1728)) << " " << conversion_to << " \n";
DisplayConversionChoices();
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
break;
case '3': // conversion_type = 3
conversion_from = "Cubic Inches";
conversion_to = "Cubic Feet.";
std::cout << "You chose type 3. Convert " << conversion_from << " to " << conversion_to << " \n";
// std::cout << "If this is not correct, press CTRL/c to exit and start over.\n";
std::cout << "\n"; // prints a blank line
std::cout << "Enter value for " << conversion_from << " and press Enter. ";
std::cin >> cu_in_inp3;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
std::cout << "\n"; // prints a blank line
std::cout << " Here is the ANSWER: \n";
std::cout << " " << cu_in_inp3 << " " << conversion_from << " equals "
<< ((cu_in_inp3 / 1728)) << " " << conversion_to << " \n";
DisplayConversionChoices();
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
break;
case '4': // conversion_type = 4
conversion_from = "Cubic Liters";
conversion_to = "Cubic Feet";
std::cout << "You chose type 4. Convert " << conversion_from << " to " << conversion_to << " \n";
std::cout << "\n"; // prints a blank line
std::cout << "Enter value for " << conversion_from << " and press Enter. ";
std::cin >> cu_lt_inp45;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
std::cout << "\n"; // prints a blank line
std::cout << " Here is the ANSWER: \n";
std::cout << " " << cu_lt_inp45 << " " << conversion_from << " equals "
<< ((cu_lt_inp45 * 0.035314638)) << " " << conversion_to << " \n";
DisplayConversionChoices();
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
break;
case '5': // conversion_type = 5
conversion_from = "Cubic Liters";
conversion_to = "Cubic Centimeters.";
std::cout << "You chose type 5. Convert " << conversion_from << " to " << conversion_to << " \n";
// std::cout << "If this is not correct, press CTRL/c to exit and start over.\n";
std::cout << "\n"; // prints a blank line
std::cout << "Enter value for " << conversion_from << " and press Enter. ";
std::cin >> cu_lt_inp45;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
std::cout << "\n"; // prints a blank line
std::cout << " Here is the ANSWER: \n";
std::cout << " " << cu_lt_inp45 << " " << conversion_from << " equals "
<< ((cu_lt_inp45 * 1000)) << " " << conversion_to << " \n";
DisplayConversionChoices();
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
break;
case '6': // conversion_type = 6
conversion_from = "Cubic Centimeters";
conversion_to = "Cubic Liters.";
std::cout << "You chose type 6. Convert " << conversion_from << " to " << conversion_to << " \n";
std::cout << "\n"; // prints a blank line
std::cout << "Enter value for " << conversion_from << " and press Enter. ";
std::cin >> cu_cm_inp6;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
std::cout << "\n"; // prints a blank line
std::cout << " Here is the ANSWER: \n";
std::cout << " " << cu_cm_inp6 << " " << conversion_from << " equals "
<< ((cu_cm_inp6 / 1000)) << " " << conversion_to << " \n";
DisplayConversionChoices();
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
break;
case '7': // conversion_type = 7
i_am_done = 'Y'; // user chose 7, no more conversions
std::cout << "You chose 7. DONE WITH CONVERSIONS [7]\n";
std::cout << "\n"; // prints a blank line
std::cout << "..............END OF VOLUME CONVERSION SECTION..............\n";
std::cout << "\n"; // prints a blank line
std::cout << " Press Enter to CONTINUE TO THE NEXT SECTION."; // pauses pgm
std::cin.get(); // continues upon Enter input
std::cout << "\n"; // prints a blank line
std::cout << "\n"; // prints a blank line
std::cout << "\n"; // prints a blank line
std::cout << "\n"; // prints a blank line
break;
default: // conversion_type DOES NOT EQUAL 1 THRU 7
std::cout << "\n"; // prints a blank line
std::cout << "INPUT ERROR: You did not enter a valid number (1-7).\n";
std::cout << " You entered: " << conversion_type << " \n";
std::cout << "\n"; // prints a blank line
std::cout << " Press Enter and then enter a valid number.\n"; // pauses pgm
std::cin.get(); // continues upon Enter input
DisplayConversionChoices();
std::cout << "Choose a NUMBER (1 to 7), and press Enter: ";
std::cin >> conversion_type;
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
break;
} // end of switch section
} // end of while section
char nbr_type; // C for cubic feet, L for cubic liter NEEDED?????
char nbr_type_set = 'N'; // Y/N switch
char vol_type = 'P'; // sets a value of "P"
std::string print_type;
std::string ruler_type;
std::cout << "..............2. SPEAKER DIMENSION SECTION..............\n";
std::cout << "\n"; // prints a blank line
while (nbr_type_set == 'N') {
std::cout << "You can enter the volume in cubic feet (C) or cubic liters (L).\n";
std::cout << "\n"; // prints a blank line
std::cout << "Make your choice by typing 'C' or 'L', and press Enter: ";
std::cin >> nbr_type;
std::cout << "\n"; // prints a blank line
switch (nbr_type) {
case 'C':
case 'c':
nbr_type_set = 'Y';
vol_type = 'C';
print_type = "cubic feet";
ruler_type = " inches. \n";
std::cout << "You have chosen to enter " << print_type << " for the volume required.\n";
std::cout << "\n"; // prints a blank line
break;
case 'L':
case 'l':
nbr_type_set = 'Y';
vol_type = 'L';
print_type = "cubic liters";
ruler_type = " centimeters. \n";
std::cout << "You have chosen to enter " << print_type << " for the volume required.\n";
std::cout << "\n"; // prints a blank line
break;
default:
std::cout << "You did not enter a 'C' (c) for cubic feet, or 'L' (l) for cubic liters.\n";
break;
} // end of switch for to choose "C" or "L"
} // end of while looking for either "C" or "L"
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
float volume_entered;
float depth_multiplier, height_multiplier;
/* the following two lines do not validate the input number.
1. std::cout << "Type the volume (in " << print_type << ") and press Enter: ";
2. std::cin >> volume_entered; // input of volume number taken here
The six code lines below validate the input number for the float variable.
An input of a letter or other non-number character would cause problems.
*/
std::cout << "Type the volume (in " << print_type << ") and press Enter: ";
while ((!(std::cin >> volume_entered)) ||
(volume_entered <= 0)) {
std::cin.clear();
std::cin.ignore(100, '\n');
std::cout << "Please enter a valid number using 0-9 and possibly a decimal point: ";
} // end of while
std::cout << "\n"; // prints a blank line
float cf_x1728eq_ci = 1728; // multiplier for cubic feet to cubic inches
float culiter_x1000eq_cucm = 1000; // multiplier for cubic liters to cubic centimeters
float cubic_inORcm;
if (vol_type == 'L') {
cubic_inORcm = volume_entered * culiter_x1000eq_cucm; // cu liter X 1000 = cu cm
} else {
cubic_inORcm = volume_entered * cf_x1728eq_ci; // cu ft X 1728 = cu in
}
std::cout << "Your input of " << volume_entered << " " << print_type << " was used to create the dimensions \n";
std::cout << "of three speaker boxes. Be ready to COPY DOWN the dimensions. \n";
std::cin.ignore(100, '\n'); // clears the input buffer of 100 chars
std::cout << " Press Enter to see the dimensions.\n"; // pauses pgm
std::cin.get(); // continues upon Enter input
std::cout << ".....NORMAL SPEAKER BOX............ \n";
std::cout << "Box Ratio is D=0.62:W=1:H=1.61 (almost 3:5:8)\n";
std::cout << "This is the Golden Ratio used since the Egyptian Pyramids \n";
float nor_width, nor_depth, nor_height;
nor_width = pow((cubic_inORcm), .3333); // this value was supplied by Weems
nor_depth = nor_width * .62;
nor_height = nor_width * 1.61; // more accurate than 1.62 in Weems book p.104
std::cout << " Width is " << nor_width << ruler_type;
std::cout << " Depth is " << nor_depth << ruler_type;
std::cout << " Height is " << nor_height << ruler_type;
std::cout << "\n"; // prints a blank line
std::cout << ".....FAT SPEAKER BOX........Ratio is D=4:W=5:H=6......\n";
float fat_width, fat_depth, fat_height;
fat_width = pow((cubic_inORcm), .335); // this value was supplied by Weems
fat_depth = fat_width * .8;
fat_height = fat_width * 1.2;
std::cout << " Width is " << fat_width << ruler_type;
std::cout << " Depth is " << fat_depth << ruler_type;
std::cout << " Height is " << fat_height << ruler_type;
std::cout << "\n"; // prints a blank line
std::cout << ".....TALL SPEAKER BOX.......Ratio is D=6:W=9:H=16......\n";
float tall_width, tall_depth, tall_height;
tall_width = pow((cubic_inORcm), .3267); // this value was supplied by Weems
tall_depth = tall_width * .67;
tall_height = tall_width * 1.8;
std::cout << " Width is " << tall_width << ruler_type;
std::cout << " Depth is " << tall_depth << ruler_type;
std::cout << " Height is " << tall_height << ruler_type;
std::cout << "******************************************************** \n";
std::cout << "* * \n";
std::cout << "* MAKE NOTE OF THE DIMENSIONS LISTED ABOVE * \n";
std::cout << "* * \n";
std::cout << "******************************************************** \n";
std::cout << "END OF THE PROGRAM. Press Enter to close. \n";
std::cin.get(); // continues upon Enter input
return 0; // the zero indicates no problems
} // end of main() function
void DisplayConversionChoices() {
std::cout << "\n"; // prints a blank line
std::cout << "These six different conversions are available: \n";
std::cout << " 1. Convert CUBIC FEET to CUBIC LITERS [1]\n";
std::cout << " 2. Convert CUBIC FEET to CUBIC INCHES [2]\n";
std::cout << " 3. Convert CUBIC INCHES to CUBIC FEET [3]\n";
std::cout << " 4. Convert CUBIC LITERS to CUBIC FEET [4]\n";
std::cout << " 5. Convert CUBIC LITERS to CUBIC CENTIMETERS [5]\n";
std::cout << " 6. Convert CUBIC CENTIMETERS to CUBIC LITERS [6]\n";
std::cout << " 7. DONE WITH CONVERSIONS [7]\n";
std::cout << "\n"; // prints a blank line
}
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