Write a C program NOT C++ Write a C program to calculate the factorial of a numb

Question

Write a C program NOT C++

Write a C program to calculate the factorial of a number. The factorial n! of a positive number (integer) is defined by n! = n*(n - 1)*(n - 2)* ...*3*2*1, where 0! = 1. In function main prompt the user for a non-negative integer less than 15 for which the factorial is to be found. Use a while validation loop to assure the number entered is in the proper range. Then call a function to calculate the factorial. The input to the function is the integer n and the return value is n factorial. Use data type double for the factorial. In the function use a for loop to calculate die factorial. Make provision for the situation in which n = 0. Return the value of n factorial to function main and print. Test with n = 14.

Explanation / Answer

main.c

#include <stdio.h>
double multiplyNumbers(double n);
int main()
   {
       double number;
       double valid = 0;

       while( valid == 0 ) {
           printf("Enter a number between 1 and 15 : ");
           scanf("%lf", &number );
           if( (number < 1) || (number > 15) )
               printf("Number is outside legal range ");
           else
           printf(" Factorial of %f = %f", number, multiplyNumbers(number));
               valid = 1;
       }
       return 0;
      
   }
  
   double multiplyNumbers(double n)
{
    double factorial = 1;
    int i;
    for(i=1; i<=n; ++i)
        {
            factorial *= i;              // factorial = factorial*i;
        }
      
        return factorial;
}

Output:-

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