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denis-greek [22]
3 years ago
15

. Write a recursive function names factorial to compute the factorial of the parameter. Also write the main function, where you

ask the user to input a non-negative integer number. Then call the function factorial and display the result.
Computers and Technology
1 answer:
r-ruslan [8.4K]3 years ago
4 0

Answer:

Following are the code in c language

#include <stdio.h> // header file

long int factorial(int n); // declaration of factorial function

int main() // main function

{

   int n; // variable declaration

   printf("Enter a positive integer: ");

   scanf("%d", &n); // input number

   while(n<0) // checking the condition if number is negative

{

    printf("please enter a positive number:");

    scanf("%d", &n);

}

   printf("Factorial of %d = %ld", n, factorial(n)); // calling  factorial function

   return 0;

}

long int factorial(int n1) // recursive definition of factorial

{

   if (n1 >= 1)

       return n1*factorial(n1-1);

   else

       return 1;

}

Explanation:

In this program, it ask for a positive number input. if the value enter by user is negative then it again ask for positive input i.e positive number. Then it calls the recursive function of factorial. the recursive function factorial calculate the factorial recursively. suppose user input 4 then it goes to the if  part of program i.e return n*factorial(n-1); that means return 4*factorial(3) again recursive function call itself .this process repeated until it meets the base condition.  when a base condition meets, it return factorial of the given number.

output

Enter a positive integer: 5

factorial of 5=120

Enter a positive integer: -8

please enter a positive number:4

factorial of 4=24

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