# if then elif

Shawn Minisall trekker182 at gmail.com
Wed Oct 10 22:29:21 CEST 2007

```I just learned about if, then elif statements and wrote this program.
The problem is, it's displaying all of the possibilities even after you
enter a 0, or if the fat grams are more then the total number of
calories , that is supposed to stop the program instead of continuing on
with the print statements that don't apply.  Any idea's?  thanks

#Prompt for calories
cal = input("Please enter the number of calories in your food: ")

#Prompt for fat
fat = input("Please enter the number of fat grams in your food: ")

#Input validation
if cal or fat <= 0:
#Display message
print "Error.  The number of calories and/or fat grams must be
positive"
print

else:
#Calculate calories from fat
calfat = float(fat) * 9

#Calculate number of calories from fat
caldel = calfat / cal

#change calcent decimal to percentage
calcent = caldel * 100

if calfat > cal:
print "The calories or fat grams were incorrectly entered."

else:
#evaluate input
if caldel <= .3:
print "Your food is low in fat."
elif caldel >= .3:
print "Your food is high in fat."

#Display percentage of calories from fat
print "The percentage of calories from fat in your food is %",
calcent

Here's an example of the output...