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write a program to check whether entered number is prime or not


Prime number: A natural number which has exactly two distinct natural number divisors: 1 and itself.

A number is taken from user and is checked whether prime number or not.
Select To use this code as it is.. select and copy paste this code into code.cpp file :)
  1. #include<iostream.h>
  2. #include<conio.h>
  3. void main()
  4. {
  5. clrscr();
  6. int n,m;
  7. cout<<"Please enter a number: ";
  8. cin>>n;
  9. for (int i=2;i<=(n-1);i++)
  10. {
  11. if(n%i==0)
  12. //Coding by: Snehil Khanor
  13. //http://WapCPP.blogspot.com
  14. {
  15. cout<<"Not a prime";
  16. break;
  17. }
  18. else
  19. {
  20. cout<<"Prime";
  21. break;
  22. }
  23. }
  24. getch();
  25. }

14 comments:

Anonymous July 5, 2011 at 8:56 PM  

when entering 1,2,3 etc no result..........

alok July 30, 2011 at 2:54 PM  

#include
#include

void prime();
void main()
{
prime();
}

void prime()
{
int n,m;
char z;
cout<<"enter the number you want to check whether its prime or not :"<>n;

m=n-1;
if(n==1 || n==2 || n==3)
{cout<>z;
if (z=='y')
{ prime();}

}

alok tiwari July 30, 2011 at 2:54 PM  

this would b ryt answer!!

freak July 30, 2011 at 2:55 PM  

#include
#include

void prime();
void main()
{
prime();
}

void prime()
{
int n,m;
char z;
cout<<"enter the number you want to check whether its prime or not :"<>n;

m=n-1;
if(n==1 || n==2 || n==3)
{cout<>z;
if (z=='y')
{ prime();}

}

alok July 30, 2011 at 2:57 PM  

half da statement after pasting is missing ..due to this html stuff..ol da things inside angle brackets r gone :O..sad

prashant makur December 24, 2011 at 11:48 AM  

enter the no and check prime or not?
#include
main()
{
int n,i,c=0;
printf(" enter any no..");
scanf("%d"&n);
for(i=2;i0)
printf("not prime");
getch();
}

Anonymous January 24, 2012 at 2:05 PM  

chutiye

somu March 2, 2012 at 6:46 AM  

it show error of misplaced error. why does it so

Anonymous April 23, 2012 at 8:04 PM  

the above code is not right, go get right code goto
http://www.bitavoncpp.com/example.html

Anonymous August 8, 2012 at 10:24 AM  

u know u all r ass hole...
mother fucker

Anonymous September 5, 2012 at 11:36 AM  

Shows not prime only when not divisible by 2.
9 ,25 such numbers are displayed as prime

Anonymous September 12, 2012 at 5:08 PM  

#include
#include
void main ()
{ int n,flg;
cout<<'enter no : ';
cin>>n;
flg=0;
for(i=2;i<n/2;i++)
{
if(n%i==0)
flg=1;
}
if(flg=0)
cout<<i;
getch();
}

Poras21 June 2, 2013 at 3:31 PM  
This comment has been removed by the author.
Poras21 June 2, 2013 at 3:34 PM  

#include
#include
void main()
{
int a,r,i;
int factor=0;
cout<<"Enter a no. \n";
cin>>a;

for(i=1;i<=a;i++)
{

r=a%i;

if(r==0)
{
factor=factor+1;
}
}

if(factor==2)

cout<<a<<" is prime \n";

else

cout<<a<<" is not prime \n";

getch();
}

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