$2.[4$ points.$]$ File Output. You should turn in one m$-$file for this problem.

Recall the function fact you wrote in the previous assignment. Write a program that com$-$ putes n$!$ for n $=1,...,10$ and writes the results into the file factorials.txt$.$ You will need to use fopen to open to file, fprintf to write the results to the file, and fclose to close the file when you are done. The output you write into the file should be as follows:

$1!=1$

$2!=2$

$3!=6$

$4!=24$

$5!=120$

$.$

$..$