How do you write a program to compute and print the factorial of given number using a while loop in c plus plus?

Answer 1

// returns n!

int fact(final int n) {

// keep track of factorial calculation in f

// f starts at n, and we will multiply it by all integers less than n

int f = n;

// loop from n-1 down to 2

for(int i = (n - 1); i > 1; --i) {

// increase our total product

f *= i;

}

return f;

}

Answer 2

#include

#include

void main()

{

int n,i,fact=1;

clrscr();

printf("enter the value of n:");

Scanf("%d",&n);

for(i=1;i<=n;i++)

fact=fact*i;

printf("%the factorial of n%d is %d ",n,fact);

getch();

}

Answer 3

import java.util.*;

public class fact2

{

public static void main(String[] args)

{

Scanner kbd = new Scanner(System.in);

System.out.println("Enter any number");

int num = kbd.nextInt();

int temp=1,fact=1;

while(temp<=num )

{

fact = fact* temp;

temp++;

}

System.out.println("The factorial is:" +fact);

}

}

Answer 4

The problem with factorials is that small numbers have huge factorials. Even a 64-bit unsigned int is only capable of storing 20 factorial (denoted 20!). Therefore any factorial function that returns a 64-bit unsigned int must assert for values greater than 20.

UINT64 factorial (UINT64 num)

{

assert (num<21);

UINT64 result = 1;

while (1 < num) result *= num--;

return result;

}

To accommodate factorials greater than 20, you have to create a user-defined class to accommodate the result as there are no built-in types available.

Answer 5

echo factorial of a number

echo Enter the number

read n

i=1

fact=1

while test $i -le $n

do

fact=`expr $fact \* $i`

i=`expr $i + 1`

done

echo The factorial of a number is $fact

Answer 6

Program to calculate factorial using while loop in c

#include

#include

void main()

{

int i,fact=1,a;

printf("enter the num whose factorial u want to take out");

scanf("%d",&a);

i=a;

while(i>0)

{

fact=fact*i;

i--;

}

printf("factorial=%d",fact);

getch();

}

Program to calculate factorial using while loop in c++

#include

#include

void main()

{

int i,fact=1,a;

cout<<"enter the num whose factorial u want to take out";

cin>>a;

i=a;

while(i>0)

{

fact=fact*i;

i--;

}

cout<<"factorial="<

getch();

}

-Shruti Jain

Answer 7

double Factorial(int i)

{

double x = 1;

if (i <= 1)

return 1;

do

{

x *= i--;

} while (i > 0);

return x;

}

Answer 8

unsigned __int64 factorial(unsigned __int64 number)

{

unsigned __int64 factorial=1;

while(number)

factorial*=number--;

return(factorial);

}

Answer 9

In Java (not tested): long factorial(int number) { long result = 1; for (int i = 1; i