Common Programs Prime Number up to N number / First Ten Prime numbers / Factorial of a given number

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Submitted by:-
Akhilesh Sharma India / Punjab / Nawanshahr.
(+91)(0)9463008090
 
 
1. //Program to find the factorial of given number;
#include<iostream.h>
#include<conio.h>
void main()
{
long num,fact=1;
clrscr();
cout<<"\n Enter the number to find the factorial: ";
cin>>num;
for(;num>0;)
{
fact=fact*num;
num--;
}
cout<<"Factorial is :"<<fact;
getch();
}
/**********************
2. //Prime numbers up to N number
#include<iostream.h>
#include<conio.h>
#include<ctype.h>
void main()
{
 int num,i,j;
 clrscr();
 cout<<"Please Enter the Number upto which prime numbers are to be generated :";
 cin>>num;
 //Validation
 while(num<=0)
 {
 cout<<"Please Enter a Number greater than or equal to 1";
 cin>>num;
 }
 cout<<"1 ";
 for(i=2;i<=num;i++)
 {
  for(j=2;j<=num;j++)
  {
   if(i%j==0)
   break;
  }//end of Inner for Loop
  if(i==j)
  cout<<j<<" ";
 }//End of Outer for Loop
 getch();
}
//************
3. // To find the first 10 prime numbers
#include<iostream.h>
#include<conio.h>
void prime(int i, int c, int n, int j) /* This function can be used to find prime numbers to any
extent ( first 10 here) by simply changing the while statement */
{
 while (c <=10)
 {
  n=0;
  i +=1;
  for (j=1 ; j<=i ; j++ )
  {
   if ( i%j == 0)
   {
    n +=1;   
   }
  }
  if (n <=2 && n != 0)
  {
   cout<<i<<"\n";
   c +=1;
  }
 }
}
void main()
{
 int i=0,c=1,n,j;
 prime(i,c,n,j);
 cout<<"\n\nPress ENTER to close this Window";
 getch();
}


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