Solved

money(currency) calculations (newbie question)

Posted on 2004-09-10
3
266 Views
Last Modified: 2010-04-01
I'm trying to write a program that uses money through out. The problem i'm having is with the control strings ( %d, %f, %g etc)

Take for instance
========================================================
// Start Program
#include <stdio.h>
#include <conio.h>
main ()
{
float m,n,o;

o=m+n;

printf("Please enter the value of m :");
scanf("%f",&m);
printf("The value of m is equal to %g\n",m);

printf("Please enter the value of n :");
scanf("%f",&n);
printf("The value of n is equal to %g\n",n);


printf("The value of n is equal to %.2f\n",o);
getch();
}
//End Program
======================================================================

Output
===============
Please enter the value of m :15.65
The value of m is equal to 15.65
Please enter the value of n :20
The value of n is equal to 20
The value of o is equal to 7865950856751840200000000000000000.00
=================

The sum is so ridiculous and i am wondering what i have to do to fix it

Adecold
0
Comment
Question by:adecold
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 15

Accepted Solution

by:
efn earned 150 total points
ID: 12033249
Try putting the calculation of o AFTER the input of m and n.
0
 
LVL 17

Expert Comment

by:rstaveley
ID: 12033553
:-)
0
 
LVL 11

Assisted Solution

by:Jase-Coder
Jase-Coder earned 100 total points
ID: 12034324
when the calculation has been done the variables all hold garbage values, junk that was previously in that memory location. Like efn said, do the calculation after reading in the values from the keyboard.

A good programming hint, initialise your variables when you declare them, it will eliminate logic errors and hard to find bugs.

so,

in the declaration

float o = 0.0, m = 0.0, n = 0.0;

printf("Please enter the value of m :");
scanf("%f",&m);
printf("The value of m is equal to %g\n",m);

printf("Please enter the value of n :");
scanf("%f",&n);
printf("The value of n is equal to %g\n",n);

o=m+n;

printf("The value of n is equal to %.2f\n",o);
getch();
}
//End Program
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question