# Greatest of Three Numbers in Python using Nested if

Greatest of Three Numbers in Python using Nested if. It involves variable assignment and if – else Nested conditional operator. This is for Beginners, class 11,12 and Btech computer science students.

### Nested if in Python : How it work !

Greatest of Three Numbers in Python using Nested if- Nested if means if condition under another if condition. So that first the if condition is checked, if it comes to be true then the next if condition is checked. There is 4 space indentation from first to another if and 4 space indentation of what to do if conditions comes true .

### Write a program to find the greatest number from the given input

A basic python program source code to find the Greatest of Three Numbers using Nested if is written below:-

### Program code explanation

a=float(input(“Enter the first number: “))#float is numbers like6.5 we can input integers and also decimal valued numbers
#Enter the first number will be printed then the input is to be given
b=float(input(“Enter the second number: “))#a,b,c are the 3 values taken as input to compare and output
c=float(input(“Enter the third number: “))#this three will be compared
if a>=b: # first the number is compared a,b if true it moves to the indented
if a>=c: #this indentation is under first condition first condition is true then only this line is read
print(“First number :”,a,”is greatest”) # Is printed on the output after above two conditions are fulfilled

if b>a:# first the number is compared a,b if true it moves to the indented
if b>c: #this indentation is under first condition first condition is true then only this line is read
print(“Second number :”,b,”is greatest”)# Is printed after above two conditions are fulfilled

if c>a: #first the number is compared a,b if true it moves to the indented
if c>b: #this indentation is under first condition first condition is true then only this line is read
print(“Third number :”,c,”is greatest”) # Is printed after above two conditions are fulfilled

### Output of our program

Greatest of Three Numbers in Python using Nested if-

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