# Prog with file implementation for factorial
print("Program to find factorial with file implementation: ")
a = int(input("Enter number to find factorial: "))
fact = 1
for i in range(a):
    fact *= (i + 1)

f = open("factorial.txt", "w")
f.write("Program to find factorial of a number using file handling:\n")
f.write("The factorial of " + str(a) + " is " + str(fact))
f.close()

# Prog with file implementation for prime number
print("\n\nProgram to find prime number with file implementation: ")
a = int(input("Enter number to check if prime number: "))
flag = False
for i in range(2, a//2):
    if (a%i) == 0:
        flag = True
        break

output = str(a) + " is a prime number."
if flag:
    output = str(a) + " is not a prime number."

f = open("prime_num.txt", "w")
f.write("Program to chcek if a number is prime number using file handling:\n")
f.write(output)
f.close()


# Prog with file implementation for palindrom str
print("\n\nProgram to find prime number with file implementation: ")
a = input("Enter number to check if prime number: ")
rev = ""
for i in range(len(a)):
    rev += a[len(a) - i - 1]

if a == rev:
    output = str(a) + " is a palindrome string."
else: 
    output = str(a) + " is not a palindrome string."

f = open("reverse.txt", "w")
f.write("Program to chcek if a number is palindrome using file handling:\n")
f.write(output)
f.close()