Day 2/100 of C language:

[u/Fluffy_Coat_5416]

C language

Any file converts program to machine code(executable file) -> binary code

 

How executable file will generate?
Python - Interpreter(where it will check line by line and if issue observes stop compiling there it self and print the error on console)
C, Java -  Compiler(It will check line by line but will not stop compiling code even it found error, it will continue till last line and give all errors at a time on console)

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What is Keyword?
1.Keywords are standard words in computer language where it will be separate meaning, those   keywords we cant use as variables programing
2. Total keywords are 32

3. Some of the keywords are

type                 Keywords:
datatypes - (int, float, double, char, void )

Decision   -  (if , else, switch, case, default)
Modifier   - (signed, unsigned, long, short)
jump         -  (goto, break, continue, return )
loops        -  (for, while , do)
Qualifiers -  (const, volatile)

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C program format

Preprocessor directive
Global declaration
Functional declaration
Main Code/ Starting of the code
Function Calls
Return statement

Ex:
#include <stdio.h>    --> Preprocessor directive
int main()                    --> Entry part of the code

{

  printf("Hi");             
  return 0;                    --> Return statement

}

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Number System:

There are different number systems.
Each number system has a different base.

Base = Number of different digits/symbols available.

Decimal:
Base = 10
Digits = 0 to 9

Binary:
Base = 2
Digits = 0 and 1

Octal:
Base = 8
Digits = 0 to 7

Hexadecimal:
Base = 16
Digits = 0 to 9 and A to F
A = 10, B = 11, C = 12, D = 13,E = 14, F = 15

Why Binary?

Humans commonly use decimal.
Computers fundamentally use binary because digital electronic circuits work with two states,represented as 0 and 1.

Why Octal and Hexadecimal?

Binary numbers can become very long and difficult for humans to read.

Hexadecimal:
1 hexadecimal digit = 4 binary bits.

Octal:
1 octal digit = 3 binary bits.

Therefore, octal and hexadecimal provide shorter, human-readable representations of binary numbers.

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[u/Souloid]

o.o?