C++ Guide: Part 2

Dark Star

DO WHILE STATEMENT

The do while loop is the 2'nd type of loop, the main positive aspect of thios loop that whether the condition is true or false the loop will run one time, if the condition will be true then the loop will be continued otherwise it will stop..
The syntax of the do while statement is as follows:-

Code:

do
{
<program statement>
}
while(<condition>);

Here the condition is at the last so the loop will run 1'st time till reaching the condition....
The followind point should be remembered while using do-while loop:---

(1)It is executed at least once..
(1)It is executed till the condition remains trueand the control comes out as soon as the loop ends.
(1)There must be some looping terminating condition otherwise the loop willnot stop...

Here are some e.g. To clear ur doubts........

To check whether the number is Armstrong or not....

Note:- An armstrong no. Is a no. Whose digit cube sum is equal to the same no..

Code:

void main() { clrscr(); int n,k,r.s; cout<<"Enter the number\n"; cin>>n; k=n; s=0; do { r=n%10; s=s+r*r*r; n=n/10; }while(n!=0); if(k==s) cout<<"It is Armstrong no."; else cout<<"It is not Armstrong No.."; getch(); }

In the above program I had taken 4 variables n for storing the number, k for storing the value of n so that we can check the condition,s for adding,r for taking remainder or storing every digit of the entered number...
So suppose u had entered the no 153 the no. Gets stored in k so n and k both will hold 153. Now the loop will begins first acc/cond given no will get divided be 10 and the remainder will get stored in r. First when u will divide 153 by 10 the remainder will come 3 the in second line cube of 3 i.e 27 will be added to s i.e 0 so s is now 27 then the remaining part will again got divided and the cube of 5 i.e 125 then again the last no cube i.e 1 will be added so the sum of 27+125+1=153 so the no. Is armstrong no..

To find factorial of any number.

Code:

void main()
{
clrscr();
int n,f;
cout<<"Enter the number\n";
cin>>n;
f=1;
do
{
f=f*n;
n=n-1;
}while(n!=0);
getch();
}

I have already explained it so its should be clear to all...

Sam RuleZ · 22-10-2006, 12:37 PM

Nice guide !

**bakuryu** · 22-10-2006, 01:45 PM

Quote:

i+1=i;

doesn't make any sense ..... and is logically incorrect.

a = i++;
// means :
// a = i;
// i = i + 1;

and a = ++i;
//means
// i = i + 1; (and not i+1 = i)
// a = i;

Quote:

(1)The loop will not get executed if the given condition becomes false.

or if the expression is numerically 0. Any number other than 0 is considered TRUE, 0 is considered FALSE

Quote:

(1)The loop will be executed till the condition is false the result will be presented as soon as the condition becomes false.

Only if there's no break statement inside the loop. And the control comes out of the loop when the condition evaluates to FALSE, rather than "result will be presented as soon as the condition becomes false."

luvrohit85 · 22-10-2006, 07:44 PM

from where do u get this c++ guide book online can please tell me the website so that i can download it..

Dark Star · 22-10-2006, 09:56 PM

Hey I had made it by my own beleive me

**Strider** · 30-10-2006, 07:13 PM

Keep it up shah.. Good work.. Kepp them coming

22-10-2006, 12:37 PM	#1
Sam RuleZ Senior Member (500+) Join Date: Jun 2006 Location: Mumbai. Age: 17 Posts: 505 Thanks: 6 Thanked 27 Times in 22 Posts Rep Power: 18	Nice guide ! __________________ "Its better to get burnt, than to fade away"-Kurt Cobain.

22-10-2006, 07:44 PM	#3
luvrohit85 Junior Member (25+) Join Date: Sep 2006 Age: 24 Posts: 64 Thanks: 7 Thanked 5 Times in 5 Posts Rep Power: 3	hello from where do u get this c++ guide book online can please tell me the website so that i can download it.. __________________ .RoHiTkUmAr.

30-10-2006, 07:13 PM	#5
Strider Founder Join Date: Nov 2005 Location: The Last City Zion! Posts: 3,876 Thanks: 371 Thanked 411 Times in 356 Posts Rep Power: 67 OS:	Keep it up shah.. Good work.. Kepp them coming __________________ Want to ask a question? Try This! A guide on how to post a question, reply to a post etc.

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22-10-2006, 09:56 PM	#4
Dark Star Elite Member (1000+) Join Date: May 2006 Location: /dev/had0 Age: 20 Posts: 1,627 Thanks: 98 Thanked 172 Times in 146 Posts Rep Power: 45 OS:	Hey I had made it by my own beleive me

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C++ Guide: Part 2

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