Learn Python ,RUST and C - blog post 2

Understanding Data Types in Python,Rust and C progamming languages.

I am not sure whether I can cover all data types comparison in one blog post. So I might be doing it in multiple blog posts.
Standard Data Types:*

• Numbers.
• String.
• List.
• Tuple.
• Dictionary.

Numbers Datatypes
**Python programming **

Type	format	description
int	a = 10	signed integer
long	356L	Long integers
float	a = 12.34	floating point values
complex	a = 3.14J	(J) Contains integer in the range 0 to 255

The variable types are dynamically typed in python.So when you assign a value to a variable, python compiler determines the type of the variable.
But once the type is defined , the defined operations can only be performed for that particular type.
but you can change the type of the variable by assigning a different value. So in python it is the developer responsibility to maintain and make sure type of the variable intact through out the program.
For example,

>a = 10;
>a = "naveen" //allowed
>a = a + 1 // not allowed
>a = 11  //allowed
>a = a +1 // now this is allowed

**Rust programming **:

Length	signed	unsigned
8bit	i8	u8
16bit	i16	u16
32bit	i32	u32
64bit	i64	u64
128 bit	i128	u128
arch	isize	usize

signed and unsigned means whether a number can be -ve or +ve.
Each signed variant can store numbers from -(2^{n -1}) to 2^n-1
unsigned variants can vary from 0 to 2^n-1
eg: u8 means 0 to 2^8-1 = 128
signed means -2^8-1 to 2^8-1
Rust’s floating-point types are f32 and f64, which are 32 bits and 64 bits in size, respectively.
In the below example we assigned a value 129 to varialble ‘b’ which is of ‘i8’ ,so the program won’t get compiled.

fn main(){
   let a:i8 = 127;
   let b:i8= 129;  //this will cause overflow.
   let c:f32=123.32;
   let d:i8 = -127;
   let e:u8 = 127;

  println!("{}.{},{},{},{}",a,d,c,e,b);
}

when you compile the program,

error: literal out of range for `i8`
 --> datatype.rs:3:13
  |
3 |   let b:i8= 129;
  |             ^^^
  |
  = note: #[deny(overflowing_literals)] on by default

String:
Strings in python can be denoted by single quotes(’), double quotes("), triple quotes(""").

name1    = 'naveen'
name2    = "davis"
fullname = """naveen davis
                       vallooran"""

It possible to access the characters in a string using their index in python.

nam1[0] prints the character 'n'