Conditional Statements

Conditional (Decision Making)statements: 

if, if-else, if-elif-else, flowcharts, simple programs: e.g.: absolute value, sort 3 numbers and divisibility of a number 

Decision Making Statements allow the program to take the decision as which statement should be executed next.

  Decision Making statements are used when we want a set of instructions should be executed in one situation and different instructions should be executed in another situation .  

Decision making can be implemented in python using, 

1. if statements 2. if-else statements 3. if-elif-else statements 4. nested if statements 

if else statement

if <condition>:

statement(s) when condition is true

else:

statement(s) when condition is false

if elif statement

If out of multiple statements, it is required to select one statement for processing on the basis of a condition, if-elif statement is to be used. 

Its syntax is-

if <condition1>:

statement(s) when condition1 is true

elif <condition2>:

statement(s) when condition2 is true

elif <condition3>:

statement(s) when condition3 is true

elif <condition4>:

statement(s) when condition4 is true

......

else:

statement(s) when all conditions become false

#Program to find given no is even or odd

n=int(input("Enter Number"))

if(n%2==0):

print("Even Number")

else :

print("Odd Number")

# Python program to check leap year or not

year=int(input(“enter a year”))

  if (year % 4) == 0:

  if (year % 100) == 0:

  if (year % 400) == 0:

   print("Leap Year")

  else:

   print("Not a Leap Year")

  else:

   print("Leap Year")

  else:

   print("Not a Leap Year")

WAP to compute sum of digits of a given string

s='JK23 KSD 315 SD990'

sum = 0

for i in s:

 if i.isdigit() == True:

 z = int(i)

 sum = sum + z

print(sum)

WAP to find given no is positive, negative or zero

num = int(input("Enter Number") )

if (num > 0):

              print(“Number is positive”)

elif (num < 0):

              print(“Number is negative”)

else:

              print(“Number is Zero”)

#program for calculating electricity bill in Python

electricity charges and rates.

1 - 100 unit - 1.5/= 

101-200 unit - 2.5/= 

201-300 unit - 4/= 

300 - 350 unit - 5/=

above 300 - fixed charge 1500/=

additional charges

if units<=100 – 25.00

if 100< units and units<=200 – 50.00

if 200 < units and units<=300 – 75.00

if 300<units and units<=350 – 100.00

if units above 350 – No additional charges

units=int(input("please enter the number of units you consumed in a month"))

if(units<=100):

    payAmount=units*1.5

    fixedcharge=25.00

elif(units<=200):

    payAmount=(100*1.5)+(units-100)*2.5

    fixedcharge=50.00

elif(units<=300):

    payAmount=(100*1.5)+(200-100)*2.5+(units-200)*4

    fixedcharge=75.00

elif(units<=350):

    payAmount=(100*1.5)+(200-100)*2.5+(300-200)*4+(units-300)*5

    fixedcharge=100.00

else:

    payAmount=0

    fixedcharge=1500.00

Total=payAmount+fixedcharge;

print("\nElecticity bill=%.2f" %Total)

#program for calculating electricity bill in Python using and operator

units=int(input("Number of unit consumed: "))

if(units>0 and units<=100):

    payAmount=units*1.5

    fixedcharge=25.00

elif(units>100 and units<=200):

    payAmount=(100*1.5)+(units-100)*2.5

    fixedcharge=50.00

elif(units>200 and units<=300):

    payAmount=(100*1.5)+(200-100)*2.5+(units-200)*4

    fixedcharge=50.00

elif(units>300):

    payAmount=2500;#fixed rate

    fixedcharge=75.00

else:

    payAmount=0;

    Total= payAmount+fixedcharge

print("\nElecticity bill pay=%.2f: " %Total);