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Really need help with the interactive Calculator program, or will be dead

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Join Date: Sep 2007

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tendyhk

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Really need help with the interactive Calculator program, or will be dead

Sep 1st, 2007

got my first HW on the first day of class, have no idea of what to do, please help me!!!!
The HW question is this

write a program that will act as an interactive calculator capable of handling very large (larger than the largest long integer) nonnegative integers. this calculator need perform only the operations of addidtion and multiplication

in this program, each input line is of the form

num1 op num2

and should produce output such as

num1
op num2
-------------
num3

where num1 and num2 are(possibly very large) nonnegative integers, op is the single character + or *, and num3 is the integer that result fromt he desired calculation.

Program 1

Write the interactive calculator described in Programming Problem 5 on page 64 of the text.

· Do not use classes. Do use an appropriate typedef for your long numbers.

· Do use fixed-length arrays to store the digits of the long numbers the program manipulates.

· Ignore the optional part of the problem.

· Assume there is at least one space between each number and the operator symbol. Of course there will not be spaces between the digits in a number (i.e. 123, not 1 2 3).

· Do not implement multiplication. If the operator symbol is *, have the output indicate that multiplication is not yet implemented.

· Be sure to follow the guidelines given in the programming standards document on this course website.

Just to be clear, input to the program should look like this:

000655123897667676422 + 21346615433431

or like this:

564557655123897667676422 * 77621346615433431

Of course, in the second case, the program just says that it can't yet handle multiplication.

what I had though is to use 4 array, 3 that hold the numbers, and one that hold the sign, but I dont know how to write an array plus another array and save it to another array. plese help, here's the code that I had try

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#include <iostream>
#include <cstring>
using namespace std;
 
int main()
{
	const int arraysize=30;	//an array of could hold up to 30 characters
	typedef char string;	//defind string as char data type
	string num1[arraysize]; //array to store first set of numbers
	string sign[arraysize];	//array to store the operation sign
	string num2[arraysize];	//array to store second set of numbers
	string num3[arraysize];	//array to store the answer
 
	cin>>num1>>sign>>num2;
	num3=int(num1-'2')+int(num2-'1');
 
	cout<<num1<<endl<<sign<<num2<<endl<<--------<<num3<<endl;
 
 
 
	return 0;
 
}
#include <iostream>
#include <cstring>
using namespace std;

int main()
{
	const int arraysize=30;	//an array of could hold up to 30 characters
	typedef char string;	//defind string as char data type
	string num1[arraysize]; //array to store first set of numbers
	string sign[arraysize];	//array to store the operation sign
	string num2[arraysize];	//array to store second set of numbers
	string num3[arraysize];	//array to store the answer

	cin>>num1>>sign>>num2;
	num3=int(num1-'2')+int(num2-'1');

	cout<<num1<<endl<<sign<<num2<<endl<<--------<<num3<<endl;



	return 0;

}

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iamthwee

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 1st, 2007

I think you need to plan how to do this on paper to get ideas.

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Nichito

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 2nd, 2007

don't expect any problem-solving from us if you dont try it first... and actualli iamthwee is right... you should plan how you're gonna work it before you code anything... if not it's just blindfolded bat swinging...

-->sometimes i wanna take my toaster in a bath<--

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Salem

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 2nd, 2007

> got my first HW on the first day of class
> Write the interactive calculator described in Programming Problem 5 on page 64 of the text.
I find these statements to be inconsistent.

How does this work then?
It's the first day of the advanced class, but you haven't bothered with the beginners class. As such, you're already way out of your depth.

It's the 5th day of the class (hence problem 5), but it's the first one you could be bothered to turn up for.

If "or will be dead" means you'll be kicked off the course, then that is perhaps a good thing. It will allow you to find your true path, and everyone else on the course will benefit from the extra attention the tutor can give, which would otherwise be wasted on you.

The problem is simple enough, but I wouldn't say that it's in the "first day of the beginners class" range of problems.

> 000655123897667676422 + 21346615433431
Before you write the code, do you know how to do this on paper?

> Be sure to follow the guidelines given in the programming standards document on this course website.
How are we supposed to make it look like your own work, when we don' t even know what these are

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Nichito

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 2nd, 2007

there's this very interesting language called NOLAE... if you can write a program in that code, you certainly can do it in any programming language...

also you should be able to draw flow charts...

-->sometimes i wanna take my toaster in a bath<--

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ft3ssgeek

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 3rd, 2007

Dare I ask about NOLAE???

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Nichito

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 3rd, 2007

i don't know if that's what its called in english... (should've made sure first...

), but its the language base for every other languages, where commands are written in plain english... i.e:

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integer num;
read num;
num=>num*num;
write num;

hope i explained myself clearly...

-->sometimes i wanna take my toaster in a bath<--

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ft3ssgeek

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 3rd, 2007

pseudocode?

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tendyhk

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Re: Really need help with the interactive Calculator program, or will be dead

Sep 3rd, 2007

here is my updated code, I dont know how to convert int back to char and store in the string, can any one help me? and how to do the carry in the array? please help me

 Help with Code Tags 
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#include <iostream>
#include <cstdlib>
#include <cstring>
using namespace std;
 
 
int main()
{
	const int arraysize=30;	//an array of could hold up to 30 characters
	typedef char string;	//defind string as char data type
	string num1[arraysize]; //array to store first set of numbers
	string sign[arraysize];	//array to store the operation sign
	string num2[arraysize];	//array to store second set of numbers
	string num3[arraysize];	//array to store the answer
 
	char null='\0';
	int num1size=0;
	int num2size=0;
 
 
 
	char mul='*';			//This use to compare the sign store in the sign array
 
	cin>>num1>>sign>>num2;
 
	if(sign[0]==mul)		//compare sign arry, if sign is multiplication then program terminate
	{
		cout<<"The Program can not yet handle multiplication"<<endl;
		return 0;
	}
	else					//addition begin to run if sign equal to +
	{
 
		while(null!=num1[num1size])	//calculate the size of arry num1
		{
			num1size++;
		}
		num1size--;
		while(null!=num2[num2size])	//calculate the size of array num2
		{
			num2size++;
		}
		num2size--;
 
 
		int answer=int(num1[num1size]-'0')+int(num2[num2size]-'0');
		itoa(answer,num3,num1size);
 
 
	cout<<num1[num1size]
		<<endl
		<<strlen(num1)
		<<answer
		<<endl
		<<"--------"
		<<endl;
 
	}
 
	return 0;
 
}
#include <iostream>
#include <cstdlib>
#include <cstring>
using namespace std;


int main()
{
	const int arraysize=30;	//an array of could hold up to 30 characters
	typedef char string;	//defind string as char data type
	string num1[arraysize]; //array to store first set of numbers
	string sign[arraysize];	//array to store the operation sign
	string num2[arraysize];	//array to store second set of numbers
	string num3[arraysize];	//array to store the answer

	char null='\0';
	int num1size=0;
	int num2size=0;



	char mul='*';			//This use to compare the sign store in the sign array

	cin>>num1>>sign>>num2;
	
	if(sign[0]==mul)		//compare sign arry, if sign is multiplication then program terminate
	{
		cout<<"The Program can not yet handle multiplication"<<endl;
		return 0;
	}
	else					//addition begin to run if sign equal to +
	{

		while(null!=num1[num1size])	//calculate the size of arry num1
		{
			num1size++;
		}
		num1size--;
		while(null!=num2[num2size])	//calculate the size of array num2
		{
			num2size++;
		}
		num2size--;


		int answer=int(num1[num1size]-'0')+int(num2[num2size]-'0');
		itoa(answer,num3,num1size);


	cout<<num1[num1size]
		<<endl
		<<strlen(num1)
		<<answer
		<<endl
		<<"--------"
		<<endl;

	}

	return 0;

}