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May 25th, 2013, 07:02 AM
#61
Re: Area and volume of cylinder
When i select option 1 there is no problem but when i enter double program sending volume value.
Which part i have to make changes.
Code:
cout<<"\nEnter radius of Cylinder\n";
cin>>r;
cout<<"\nEnter height of Cylinder\n";
cin>>h;
switch(ch)
{
case 1:
obj.cylinder_area(r,h);
break;
case 2:
obj.cylinder_volume(r,h);
break;
default:
cout<<"\nThe choice entered is a wrong choice";
}
This isnt work in my program.
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May 25th, 2013, 09:03 AM
#62
Re: Area and volume of cylinder
You are probably reading into int variables.
Consider the following:
Code:
int r , h;
cin >> r;
cin >> h;
Reading into an int variable stops when
1) a whitespace is encountered (space, tab, return)
2) end-of-file
3) a character that is invalid for a int variable is encountered
So, if you enter 3.45 into an int variable (r), the variable gets a value of 3 ...
Since the "." is an invalid character for an int. The internal read buffer still
has the characters ".45" (without the quotes).
Next, the program executes cin >> h;
The buffer still has ".45" in it, so the code tries to read that into
the int variable (h). This results in an immediate error (since the "." is
invalid). The read fails ... so:
1) The value of the variable h is undefined.
2) Any read using cin will fail after this, until its state is reset:
However, that just resets the streams internal flags, the ".45" is still
in the buffer. Normally, you could use the ignore() function.
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May 25th, 2013, 09:22 AM
#63
Re: Area and volume of cylinder
This follows from my question in post #50. How are you going to have the user input int, float or double? How are you going to test your various class overloaded functions? You can't input a float/double number into a variable defined as int - although from post #8 you can input an int into a float or double and a float into a double.
All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!
C++23 Compiler: Microsoft VS2022 (17.6.5)
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May 25th, 2013, 10:31 AM
#64
Re: Area and volume of cylinder
I tried cin>>clear(); after cin>>r; cin>>h but it gives error.
clear undecleared for first use of function.
then i insert #include<stdio.h> library.
How can i handle.
Thank you.
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May 25th, 2013, 10:36 AM
#65
Re: Area and volume of cylinder
You're probably looking to write:
which is what Philip Nicoletti wrote in post #62.
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May 25th, 2013, 10:46 AM
#66
Re: Area and volume of cylinder
laserlight thank you,
I used as philip said but stil jumping to the volume result
Code:
#include<iostream>
#include<conio.h>
#include<stdio.h>
using namespace std;
const float PI=3.14;
class calculate
{
public:
void cylinder_area(int r,int h);
void cylinder_area(float r1,float h1);
void cylinder_area(double r2, double h2);
void cylinder_volume(int r3,int h3);
void cylinder_volume(float r4,float h4);
void cylinder_volume(double r5, double h5);
};
void calculate::cylinder_area(int r, int h)
{
cout<<"\n Area of Cylinder: "<<(2 * PI * r)*( r + h);
}
void calculate::cylinder_area(float r1, float h1)
{
cout<<"\nArea of Cylinder "<<(2 * PI * r1)*( r1 + h1);
}
void calculate::cylinder_area(double r2, double h2)
{
cout<<"\nArea of Cylinder "<<(2 * PI * r2)*( r2 + h2);
}
void calculate::cylinder_volume(int r3, int h3)
{
cout<<"\nVolume of Cylinder "<<(2 * PI * r3 * h3);
}
void calculate::cylinder_volume(float r4, float h4)
{
cout<<"\nVolume of Cylinder "<<(2 * PI * r4 * h4);
}
void calculate::cylinder_volume(double r5, double h5)
{
cout<<"\nVolume of Cylinder "<<(2 * PI * r5 * h5);
}
int main()
{
int ch;
int r,h,r3,h3;
float r1,h1,r4,h4;
double r2,h2,r5,h5;
calculate obj;
cout<<"\tTHIS PROGRAM CALCULATES AREA AND VOLUME OF CYLINDER\n";
cout<<"\n1. Area of Cylinder\n";
cout<<"\n2. Volume of Cylinder\n";
cout<<"\n\tPlease select\n";
cin>>ch;
switch(ch)
{
case 1:
cout<<"\nEnter radius of Cylinder\n";
cin>>r;
cin.clear();
cout<<"\nEnter height of Cylinder\n";
cin>>h;
cin.clear();
obj.cylinder_area(r,h);
break;
case 2:
cout<<"\nEnter radius of Cylinder:\n";
cin>>r3;
cin.clear();
cout<<"\nEnter height of Cylinder:\n";
cin>>h3;
cin.clear();
obj.cylinder_volume(r3,h3);
break;
default:
cout<<"\nThe choice entered is a wrong choice";
}
getch();
}
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May 25th, 2013, 11:00 AM
#67
Re: Area and volume of cylinder
You might want to re-read post #62, especially the very last part.
By the way, I really don't think that your member functions should be printing anything. Design them to return the result instead. This will make them more reusable, and possibly more testable too.
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May 25th, 2013, 01:21 PM
#68
Re: Area and volume of cylinder
Originally Posted by laserlight
You might want to re-read post #62, especially the very last part.
Yes, but the current issue with this homework assignment is that the program needs to be able to input r and h and call the overloaded class functions with either int, float or double arguments. So the program needs to to able to input real numbers (float or double) as well as ints.
All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!
C++23 Compiler: Microsoft VS2022 (17.6.5)
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