How to write a factorial program and prime number prog

Question

How to write a factorial program and prime number program using array in c programming?

Ramesh Palanivel · Answer

Hi Md, Please briefly explain your requirement. How you want to use array in those programes?

Rushi Mehta · Answer

Below is prime number programme #include using std::cin; using std::cout; using std::endl; int main() { const int arraysize = 1000; int x, a[arraysize], b; for (x=0; x a[x] = 1; for (x=2; x { if ( arraysize ==1) { while ( b { b = x; x = x + b; a[b] = 0; } } } a[1] = 0; cout " here are your prime numbers from 1000 " ; for ( int c = 0; c { if (a[c] = 1) cout " " ; } return 0;

Md Nayeem · Answer

Using the array i want to find out prime and factorial number in c program

Dharmraj Thakur · Answer

Please post what you did and where you are facing issue?

Mohan Arumugam · Answer

Factorial Program using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace factorial { class fact { static void main( string [] args) { int i, num, fact; Console.WriteLine( "Enter the No" ); num = int .Parse(Console.ReadLine()); fact = num; for (i = num-1; i>=1; i--) { fact = fact * i; } Console.WriteLine( "factorial of given number is : " +fact); Console.ReadLine(); } } } 2.Prime Number Program using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace PrimeNumber { class prime { int [] num = new int [5]; int i,j; bool isprime,noprime = true ; public findprime() { Console.WriteLine( "Please enter 5 numbers: " ); for (i = 0; i num[i] = Int16.Parse(Console.ReadLine()); /* add Numbers to the Array*/ for (i = 0; i { isprime = true ; /* initialize Current number as prime Number is "true"*/ for (j = 2; j { if (num[i] % j == 0) { isprime = false ; break ; } } if (isprime) /*if no Remainder "0" Display current Number as Prime Number*/ { noprime = false ; Console.WriteLine(num[i] + " is a Prime Number" ); } } if (noprime) Console.WriteLine( "There is no a Prime number in the list" ); } } }

Mahesh Verma · Answer

Hi Md Nayeem, According to me, you want to print all prime numbers and factorial of each number in an array. So, we created two functions here, so, that you can easily find that element: #include #include void factorial ( int ); void prime( int ); void main() { int arr[10],i; clrscr(); cout "Enter elements of an array :- " ; for (i=0;i cin>>arr[i]; for (i=0;i { factorial(arr[i]); //passing each element to find factorial prime(arr[i]); } getch(); } void factorial( int n) { int fact=1; while (n>1) { fact*=n; n--; } cout "Factorial of " " is" } void prime( int n) { int i=1, factor=0; while (i { if (n%i==0) factor++; i++; } if (factor==2) cout "
" " is prime" ; }