It looks like you're new here. If you want to get involved, click one of these buttons!

- 141.4K All Categories
- 104.6K Programming Languages
- 6.4K Assembler Developer
- 1.9K Basic
- 39.8K C and C++
- 4.3K C#
- 7.9K Delphi and Kylix
- 4 Haskell
- 9.6K Java
- 4.1K Pascal
- 1.3K Perl
- 2K PHP
- 516 Python
- 48 Ruby
- 4.3K VB.NET
- 1.6K VBA
- 20.8K Visual Basic
- 2.6K Game programming
- 311 Console programming
- 89 DirectX Game dev
- 1 Minecraft
- 110 Newbie Game Programmers
- 2 Oculus Rift
- 8.9K Applications
- 1.8K Computer Graphics
- 729 Computer Hardware
- 3.4K Database & SQL
- 522 Electronics development
- 1.6K Matlab
- 628 Sound & Music
- 256 XML Development
- 3.3K Classifieds
- 195 Co-operative Projects
- 184 For sale
- 189 FreeLance Software City
- 1.9K Jobs Available
- 600 Jobs Wanted
- 201 Wanted
- 2.9K Microsoft .NET
- 1.7K ASP.NET
- 1.1K .NET General
- 3.3K Miscellaneous
- 4 Join the Team
- 0 User Profiles
- 352 Comments on this site
- 59 Computer Emulators
- 2.1K General programming
- 181 New programming languages
- 611 Off topic board
- 168 Mobile & Wireless
- 42 Android
- 124 Palm Pilot
- 335 Multimedia
- 151 Demo programming
- 184 MP3 programming
- 0 Bash scripts
- 19 Cloud Computing
- 53 FreeBSD
- 1.7K LINUX programming
- 367 MS-DOS
- 0 Shell scripting
- 320 Windows CE & Pocket PC
- 4.1K Windows programming
- 891 Software Development
- 408 Algorithms
- 68 Object Orientation
- 87 Project Management
- 90 Quality & Testing
- 237 Security
- 7.5K WEB-Development
- 1.8K Active Server Pages
- 61 AJAX
- 2 Bootstrap Themes
- 55 CGI Development
- 19 ColdFusion
- 222 Flash development
- 1.4K HTML & WEB-Design
- 1.4K Internet Development
- 2.2K JavaScript
- 34 JQuery
- 284 WEB Servers
- 151 WEB-Services / SOAP

michelle87
Posts: **1**Member

in C and C++

I'm having a lot of troubles trying to read the input data into the program. I'm a beginner of C++ and this is my first time to learn to use functions. I wrote out the code but I only got zero. Can someone please help me out?

I have use the following input data:

104

3773

13

121

77

30751

to determine the integers if they are:

1)a multiple of 7, 11 or 13

2)sum of the digits odd or even

3)the square root value(if positive)

4)is it a prime number

and here is my code:

#include

#include

#include

#include

using namespace std;

#define in_file "data.txt"

#define out_file "result.txt"

void multiple();

void sum();

double square(double);

void prime();

int num;

float value;

void main()

{

ifstream ins;

ofstream outs;

ins.open(in_file);

outs.open(out_file);

int num;

ins>>num;

multiple();

sum();

double square();

prime();

ins.close();

outs.close();

getch();

}

void multiple()

{

if (num%7==0 || num%11==0 || num%13==0)

cout<<num<<" is a multiple of 7, 11 or 13."<<endl;

}

void sum()

{

if (num%2==0)

cout<<num<<" is a even number."<<endl;

else

cout<<num<<" is a odd number."<<endl;

}

double square(double value)

{

double num=sqrt(value);

cout<<"The square root value is: "<<value<<endl;

return value;

}

void prime()

{

for (int i=2; i<=num; i++)

{

for (int j=2; j<i; j++)

{

if (i%j==0)

cout<<num<<" is a prime number."<<endl;

else

cout<<num<<" is not a prime number."<<endl;

}

}

}

I have use the following input data:

104

3773

13

121

77

30751

to determine the integers if they are:

1)a multiple of 7, 11 or 13

2)sum of the digits odd or even

3)the square root value(if positive)

4)is it a prime number

and here is my code:

#include

#include

#include

#include

using namespace std;

#define in_file "data.txt"

#define out_file "result.txt"

void multiple();

void sum();

double square(double);

void prime();

int num;

float value;

void main()

{

ifstream ins;

ofstream outs;

ins.open(in_file);

outs.open(out_file);

int num;

ins>>num;

multiple();

sum();

double square();

prime();

ins.close();

outs.close();

getch();

}

void multiple()

{

if (num%7==0 || num%11==0 || num%13==0)

cout<<num<<" is a multiple of 7, 11 or 13."<<endl;

}

void sum()

{

if (num%2==0)

cout<<num<<" is a even number."<<endl;

else

cout<<num<<" is a odd number."<<endl;

}

double square(double value)

{

double num=sqrt(value);

cout<<"The square root value is: "<<value<<endl;

return value;

}

void prime()

{

for (int i=2; i<=num; i++)

{

for (int j=2; j<i; j++)

{

if (i%j==0)

cout<<num<<" is a prime number."<<endl;

else

cout<<num<<" is not a prime number."<<endl;

}

}

}

Terms of use / Privacy statement / Publisher: Lars Hagelin

Programmers Heaven articles / Programmers Heaven files / Programmers Heaven uploaded content / Programmers Heaven C Sharp ebook / Operated by CommunityHeaven LLC

© 1997-2015 Programmersheaven.com - All rights reserved.

## Comments

54MemberThe reason you are only getting zero is an issue of scope. You redefine num in your main function which hides the global num and thus the global num isn't the variable that is written to when the data is read in.

Also some other issues:

[code]

//...

multiple();

sum();

double square(); // This line is ignored because it is interpreted as

// a function prototype

prime();

//...

[/code]

Instead you should have something like the following:

[code]

double value = square( num );

[/code]

But judging on the structure of your code you could probably more easily change the square function to be something like the following:

[code]

void square( );

//...

void square( )

{

double value = sqrt( num );

cout<<"The square root value is: "<<value<<endl;

}

[/code]

Your prime function finds all primes less than that of the number you are looking for so that doesn't seem to operate as specified in that the function should determine whether or not the number is a prime or not.

And lastly you should add a loop around your read and function calls:

[code]

ins>>num;

while( !ins.fail() )

{

multiple();

sum();

square();

prime();

ins>>num;

}

[/code]

754Member754Member754Member