VARIABLE DECLARATION:
TO DECLARE AND INITIALISE A VARIABLE WE DO IT DIRECTLY IN PYTHON.
RULES FOR DECLARATION OF VARIABLES IN PYTHON:
- A variable name should start only with underscore or alphabets.
- A variable name should not start with numeric.
- A variable name is case sensitive.
- A variable can contain alphabets, integer and underscore.
my_name = “ Tom “
_myname = “ Tom “
_my_name = “ Tom “
TO DECLARE INTEGERS:
We can declare integers, floating numbers and complex numbers.
SYNTAX TO DECLARE FOR INTEGERS:
>>>Intnum =7
>>>print(intnum)
OUTPUT: 7
SYNTAX TO DECLARE FOR STRINGS:
>>>myword = “HelloWorld”
>>>print(mystring)
OUTPUT: HelloWorld
ASSIGNING MULTIPLE VALUES TO VARIABLES:
Python allows the user to initialise the variables simultaneously.
SYNTAX:
>>>x, y, z = ”tom”, “john”, “jim”
>>>print(x)
>>>print(y)
>>>print(z)
OUTPUT: tom
John
Jim
BUILT-IN FUNCTIONS:
Python has many inbuilt functions. Now here are some functions which are important and required for those who are learning basics.
- abs(x) : This function returns the absolute value of x.
- max(x1,x2,x3) : This function returns the largest value among x1,x2,x3.
- min(x1,x2,x3) : This function returns the smallest value among x1,x2,x3.
- round(x) : Returns the integer nearest to x.
- input(x) : It allows user to enter the value of x.
PROGRAM EXECUTION SYNTAX FOR SOME BUILTIN FUNCTIONS:
FOR abs(x):>>>x = -2
>>>abs(x)
>>>print(x)
OUTPUT: 2
1.FOR max(x1,x2,x3):
>>>x1=5
>>>x2=7
>>>x3=9
>>>x=max(x1,x2,x3)
>>>print(x)
OUTPUT: 9
2.FOR min(x1,x2,x3):
>>>x1=5
>>>x2=7
>>>x3=9
>>>x=max(x1,x2,x3)
>>>print(x)
OUTPUT: 5
MATHEMATICAL FUNCTIONS:
Like other programming languages python also has an inbuilt function for mathematical problems.
FIRST TO USE WE MUST IMPORT MATHS.
WE SHOULD USE THE SYNTAX:
import math
These are the few important mathematical syntaxes:
- math.fabs(x) The math. fabs() method returns the absolute value of a number. Absolute denotes a non-negative number.
2 )math.ceil(x)-The java.lang.Math.ceil(double a) Returns the smallest (closest to negative infinity) double value that is greater than or equal to the argument and is equal to a mathematical integer
3.math.floor(x)-The Math. floor() function returns the largest integer less than or equal to a given number.
4.math.log(x)
5.math.sqrt(x)
6.math.cos(x)
7.math.sin(x)
PROGRAM EXECUTION:
>>>import math
>>>x=math.fabs(-2)
>>>print(x)
OUTPUT: 2
>>>import math
>>>x=math.ceil(2.1)
>>>print(x)
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