Question

Write a parameterized function that takes in a file name as a parameter, reads the file, calculates the factorial of each number, and displays a formatted output as follows:

Factorial of 10  =  3628800
Factorial of 5  = 120 

Answer 1

Short Summary:

• Since you did not mention the programming language to be used, I used C programming and shown you sample run,

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Source Code:

#include <stdio.h>

// Function to find factorial of given number
unsigned int factorial(unsigned int n)
{
if (n == 0)
return 1;
return n * factorial(n - 1);
}

int main()
{
// file to read the integers
FILE* file = fopen ("input.txt", "r");
int i = 0;
  
// read first integer
fscanf (file, "%d", &i);   
// continue to read till end of file
while (!feof (file))
{
//Calculate factorial
printf ("Factorial of %d: %d\n", i, factorial(i));
// read the next integer
fscanf (file, "%d", &i);
}
// clost the input file
fclose (file);

return 0;
}

Refer the following screenshots for code indentation:

Sample Run:

Iinput.txt file:

output:

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