Lets get to know more about programming

• Programming is all about writing a sequence of instructions

• Lets try to calculate area of circle and the steps in that:

• To allocate memory in the RAM, we also need to specify the size/amount of memory and the address of the memory (generally represented as hexa decimal numbers)

• All programming languages support some thing called as data types which will inform OS how much memory is to be allocated.

• Some of the popular data types are

  • int
  • float
  • bool

• To solve the problem of referring memory addresses, all programming languages support the concept of references or alias

int a # allocate a memory location to store integers and i will be referring the value in memory by using a

float b # allocate a memory location to store decimal and i will be referring the value in memory by using b

• Now on the memory if we need perform operations (i.e. assign a value)

int a = 10

a = 11

• Some languages like python will not even expect to use data types for allocating memory (Dynamic languages)

a = 10
a = 11
b = 10.5
c = True

• So now we know little bit about allocating memory for our programs

• Now we need to use the values in the memory to perform some operations, Every language to perform operations on memory has operators

  • + : add
  • –: subtract
  • *: multiply
  • /: division
  • //: integer division
  • %: reminder or modulus
  • =: assignment
  • ==: equals to
  • !=: not equals to

• Lets use the knowledge we have gained to calculate area of rectangle by speaking with Jarvis

Hi Jarvis
length = 100 # Allocate memory for 100 and call it as length
breadth = 100 # Allocate memory for 100 and call it as breadth
print length * breadth

• Lets use the knowledge we have gained to calculate simple interest by speaking with Jarvis

Hi Jarvis
principal = 10000
rate = 10
time = 5
print principal * time * rate / 100