Scripting/Programming Essentials

• For Programming we need majorly the following resources from OS
  • Processor
  • Memory (RAM)
• Try to look at programming as speaking with some one who just understands basic arthimetic operations.
• To solve problems we had discussed it is better to write psuedo codes/algorithmss
• In this series lets understand basic terms.

DataType and Variables

• Datatype is type of data, we use this get memory on RAM. This determines size in (bits/bytes)
• Generally all the languages makes this simple by speaking terms which we understand
  • integer
  • decimal/float/double
  • boolean
• Alias of memory location if the value in memory can be changed is Variable
• Alias of memory location if the value in memory cannot be changed is constant
• Lets read these lines

# C, C++, Java, C#
int age = 20;

# perl, shell
$age = 20

# python
age = 20

• There are two kinds of Languages
  • Static Typed Languages
  • Dynamic Type Languages

Assignment

• Allocating Value into memory using datatype/variable. Assignment is generally represented by operator =

age = 20

Operator

• Operations supported by the language are called as opertors
• Generally you would see classifications
  • Arthemetic Operators
  • Binary Operators
  • Text Operators

Exercise-1

• Try to find whether given number is prime assuming the language which you are using has the following operators

+ => additon
- => subtraction
* => multiplication
/ => division
% => modulous
= => assignment
== => equality
!= => not equals

data type will be integer

• Psuedo code of prime number

integer number = 7
integer index = 2
check: 
is number % index == 0 or index == number
if true then not prime exit program
if false increment index and go to step check:

print number is prime

exit:
  print number is not prime

Exercise-2

• Try to find largest factor of the number assuming the language which you are using has the following operators

+ => additon
- => subtraction
* => multiplication
/ => division
% => modulous
= => assignment
== => equality
!= => not equals

data type will be integer

• Sample Inputs and outputs

INput: 1000
500 is the largest factor

Input is 9
3 is the largest factor