# File: Erin/factorial.py
#   fact(n) computes factorial of n. Recursive. try big numbers
# 	0! = 1
# 	n! = n * (n-1)!
#>>> 
#    I compute n!. Enter n > 5
#    Factorial of 5 = 120
#    I compute n!. Enter n > 6
#    Factorial of 6 = 720
#    I compute n!. Enter n > 1
#    Factorial of 1 = 1
#    I compute n!. Enter n >    // type just ENTER

def fact( n ):
    if ( n == 0 ):
        return 1
    else:
        return n * fact( n - 1 )
    
def main():
    while True:                 #loop for ever
        n = input( "I compute n!. Enter n > " )     
        if (n == "") :          #stop when type ENTER
            break 
        n = eval( n )           #convert n from string to integer
        print("Factorial of %d = %d" % ( n, fact(n) ))
        
main()