© a+ computer science - ...© a+ computer science - if statements allow you to run code only if a...

If statements allow you to run code only if a condition is met.

num = 97if num >= 90:

print "Hello"print "World"

OUTPUTHello

If statements will skip the code if the condition is not met.

num = 50if num >= 90:

OUTPUTWorld

Code inside an if statements must be indented

num = 97if num >= 90:

OUTPUTHello

Relational operators compare two values and return True or False

num = 150print (num <= 90)

OUTPUTFalse

Relationalfrequently used operators

Name Use

== Determines if two values are equal

!= Determines if two values are not equal

> Determines if a value is greater than another

< Determines if a value is less than another

>= Determines if a value is greater than or equal to another

<= Determines if a value is less than or equal to another

If-Else statements allow you to execute different code if the statement is false

seconds = 10if seconds >= 60:

print "Over a minute"else:

print "Less than a minute"

OUTPUTLess than a minute

OUTPUTOver a minute

seconds = 90

if seconds >= 60:

print "Less than a minute" print "Over a minute"

OUTPUTLess than a minute

seconds = 10

if seconds >= 60:

print "Less than a minute" print "Over a minute"

seconds = 100 if seconds < 60:

print "Less than a minute"elif seconds < 120:

print "Over a minute“else:

print "Over two minutes"

OUTPUTOver a minute

If-elif statements allows you to check multiple conditions to determine which code to execute

OUTPUTOver a minute

seconds = 100

if seconds < 60:

elif seconds < 120:

print "Less than a minute"False

print "Over a minute"print "Over two minutes"

Logical operators allows you to check multiple conditions in the same if statement

x = 50y = 100if x < 400 and y < 300:print "Upper right"

elif x < 400 and y > 300:print "Upper left"

else:print "Bottom"

OUTPUTUpper right

Relationalfrequently used operators

Name Use

x or y Either x or y must be true

x and y Both x and y must be true

not x If x is true, it becomes false

If x is false, it becomes true

If statements can be put inside other if statements

OUTPUT

Passing

grade = 97if grade >= 70:print "Passing"if grade >= 90:

print “A"else:print "Failing"

The else part of and if-else statement MUST be in line with it’s corresponding if

OUTPUT

Passing

Failing

grade = 75if grade >= 70:print "Passing"if grade >= 90:

print “A"else:print "Failing"

The code in the lab runner files use nested ifs and elifs to check which key is pressed

if event.type==QUIT or (event.type==KEYUP and event.key==K_ESCAPE):

sys.exit()

elif event.type==KEYUP:if event.key==K_UP:keys = "Up Key"

elif event.key==K_DOWN:keys = "Down Key"

elif event.key==K_LEFT:keys = "Left Key"

elif event.key==K_RIGHT:keys = "Right Key"

© a+ computer science - ...© a+ computer science - if statements allow you to run code only if a...

Documents

ray tracing - university of cambridge · the ray tracing...

piece num: 3 de requisition num: 109012 · title: piece...

viver num camiÃo

the internet - inria - inventeurs du monde num©rique

gruesome groaners teresa and paul jennings music k-8, vol....

section/ 2 eme annee sciences num.22427502 ©©© trois

analyse num

team leo - inria - inventeurs du monde num©rique

area income characteristics€¦ · million ; num of amount...

programming manual tg volume 1 -...

num 1000 family -...

phy 1234 : introduction `a la physique num©rique -...

appendix 6-4 three year financial spreadsheet and ratio...

cnc-sstem - num

© 2005 microchip technology incorporated. all rights...

data set name: furthcjasn2011r.sas7bdat · 51 lp_ldl num 8...

cap42 rep num

mod©lisation multiphysique et simulation num©rique des...

num integers

parallel processing - inria - inventeurs du monde num©rique