Help! I'm a Beginner

[Aparna Prasad]

#include<iostream.h>

#include<stdlib.h>

int main()

{  int rnum,i;

   for(i=0;i<5;++i)

    cout<<(rnum=rand())<<endl;

   return 0;

}

Q: How does rnum get its value since no number is taken as input nor it is declared?

P.S

This is my program 

i have copied this from my book(beginning random numbers)

[David Rodríguez Ibeas]

This is not the correct forum for that question. Consider going to a Q&A programmer's web page (Stack Overflow is the first example that comes to mind).

David

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[Václav Zeman]

Dne úterý, 29. října 2013 18:01:13 UTC+1 Aparna Prasad napsal(a):

#include<iostream.h>

#include<stdlib.h>

int main()

{  int rnum,i;

   for(i=0;i<5;++i)

    cout<<(rnum=rand())<<endl;

   return 0;

}

[...]

This is my program 

i have copied this from my book(beginning random numbers)

Your book is ancient. Burn it with fire and get some from this list: http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list
 

[Daryle Walker]

As others have said, this forum discusses the rules of C++, not general usage.

On Tuesday, October 29, 2013 1:01:13 PM UTC-4, Aparna Prasad wrote:

#include<iostream.h>

#include<stdlib.h>

int main()

{  int rnum,i;

   for(i=0;i<5;++i)

    cout<<(rnum=rand())<<endl;

   return 0;

}

Q: How does rnum get its value since no number is taken as input nor it is declared?

To actually answer your question: unlike other languages, assignment is an expression instead of just a statement. rnum is assigned the return value of the latest rand() call, then rnum is passed to the operator << call with cout. rand() is declared in the <stdlib.h> header.
 

P.S

This is my program 

i have copied this from my book(beginning random numbers)

If the book is from the era that <iostream.h> was around, it's way too old.

Daryle W.