Unit converter calculator help

This is a discussion on Unit converter calculator help within the C++ Programming forums, part of the General Programming Boards category; Come on, this is perfect for a switch. Everyone recommended a switch too. Multiple ifs is only needed for multiple ...

  1. #16
    C++まいる!Cをこわせ! Elysia's Avatar
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    Come on, this is perfect for a switch. Everyone recommended a switch too.
    Multiple ifs is only needed for multiple conditions or if you are trying to do a switch on which the type is a string (or with a cases that aren't constant values).
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  2. #17
    Unregistered User Yarin's Avatar
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    I'm just thinking how long it'll take to code. I figured it'd be easier to link to functions through ifs rather than do the equasions in a big main() switch.
    A class that doesn't overload all operators just isn't finished yet. -- SmugCeePlusPlusWeenie
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  3. #18
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    By skeleton I mean saying "Use a switch statement to direct the user's input choice to calculate the value of the conversion" or "I would set up a function table, although it is somewhat more complicated, so If-then statements would work as a back-up". I need to know how to do this myself, but i totally appreciate all of the help. Thanks again everyone

  4. #19
    C++まいる!Cをこわせ! Elysia's Avatar
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    Code:
    	bool bAbort = false;
    	switch (option)
    	{
    		case 1: Length(true); break;
    		case 2: Weight(true); break;
    		case 3: Length(false); break;
    		case 4: Weight(false); break;
    		default: bAbort = true; break;
    	}
    Doesn't look terrible to me.
    And btw, why use TRUE/FALSE when we can use true/false?
    Welcome to C++, Yarin

    Quote Originally Posted by ravens199 View Post
    By skeleton I mean saying "Use a switch statement to direct the user's input choice to calculate the value of the conversion" or "I would set up a function table, although it is somewhat more complicated, so If-then statements would work as a back-up". I need to know how to do this myself, but i totally appreciate all of the help. Thanks again everyone
    I think you have the answer to your question, and a little help on your way too
    Last edited by Elysia; 01-13-2008 at 04:31 PM.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  5. #20
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    Muchos Grassy-ass

  6. #21
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    switch statements are SOP for this kind of question. I think the teacher likely had in mind a switch rather than an if-else.

  7. #22
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    I think a switch seems the best, because if I add 5 more options, i can just add 5 more cases to the switch and not have to worry about changing all of the if statements

  8. #23
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    OK, need help looping this switch statement

    OK, so I wrote the program the way Elysia suggested, and it works great. Now, after the number is converted, i want to ask the user if they want to convert another value. If they type 'y' or 'Y', it prompts them again. 'n' or 'N' ends the program. Any suggestions are welcome, thanks. Here is my code:

    Code:
    #include "stdafx.h"
    #include <iostream>
    #include <iomanip>
    #include <fstream>
    #include <string>
    using namespace std;
    
    int main()
    {
    	double num1, meters, feet, kilos, pounds, liters, gallons, kms, miles;
    	int option;
    
    		cout << "Please select the conversion type you want to perform:" << endl;
    		cout << "1. Convert feet to meters" << endl;
    		cout << "2. Convert meters to feet" << endl;
    		cout << "3. Convert lbs. to kilograms" << endl;
    		cout << "4. Convert kilograms to lbs." << endl;
    		cout << "5. Convert gallons to liters" << endl;
    		cout << "6. Convert liters to gallons" << endl;
    		cout << "7. Convert square miles to square kilometers" << endl;
    		cout << "8. Convert square kilometers to square miles" << endl << endl;
    		
    		cin >> option;
    
    		switch(option)
    		{
    			case 1:
    				cout << endl << "Enter the number of feet to convert to meters:" << endl;
    				cin >> num1;
    				meters = num1 * 0.3048;
    				cout << num1 << " feet is equal to " << meters << " meters." << endl;
    				break;
    			
    			case 2: 
    				cout << endl << "Enter the number of meters to convert to feet:" << endl;
    				cin >> num1;
    				feet = num1 * 3.2808399;
    				cout << num1 << " meters is equal to " << feet << " feet." << endl;
    				break;
    
    			case 3:
    				cout << endl << "Enter the number of pounds to convert to kilograms:" << endl;
    				cin >> num1;
    				kilos = num1 * 0.45359237;
    				cout << num1 << " lbs. is equal to " << kilos << " kilograms." << endl;
    				break;
    
    			case 4:
    				cout << endl << "Enter the number of kilograms to convert to pounds:" << endl;
    				cin >> num1;
    				pounds = num1 * 2.20462262;
    				cout << num1 << " kilograms is equal to " << pounds << " lbs." << endl;
    				break;
    
    			case 5:
    				cout << endl << "Enter the number of gallons to convert to liters:" << endl;
    				cin >> num1;
    				liters = num1 * 3.7854118;
    				cout << num1 << " gallons is equal to " << liters << " liters." << endl;
    				break;
    
    			case 6:
    				cout << endl << "Enter the number of liters to convert to gallons:" << endl;
    				cin >> num1;
    				gallons = num1 * 0.264172051;
    				cout << num1 << " liters is equal to " << gallons << " gallons." << endl;
    				break;
    
    			case 7:
    				cout << endl << "Enter the number of square miles to convert into square kilometers:" << endl;
    				cin >> num1;
    				kms = num1 * 2.58998811;
    				cout << num1 << " square miles is equal to " << kms << " square kilometers." << endl;
    				break;
    
    			case 8:
    				cout << endl << "Enter the number of square kilometers to convert into square miles:" << endl;
    				cin >> num1;
    				miles = num1 * 0.386102159;
    				cout << num1 << " square kilometers is equal to " << miles << " square miles." << endl;
    				break;
    
    			default:
    				break;
    		}
    			
     return 0;
    }

  9. #24
    C++ Witch laserlight's Avatar
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    The new question in this thread is now at Need help looping this switch statement.
    Last edited by laserlight; 01-13-2008 at 08:32 PM.
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