Python Programming

1.9 High-Level Language

High-Level Language: A high-level language is a programming language that allows developers to write powerful and complex programs using code that is easy for humans to read and write.

  • Key Characteristics of High-Level Languages
    • Easier to Use and Understand: Uses English-like words and logical structures (e.g., if, while, print)
    • Abstracts Away Hardware Details: You don’t need to know how the CPU or memory works
    • Fewer Instructions Needed: A single line of high-level code can represent dozens or hundreds of machine instructions

1.9.1. Compilers and Interpreters

  • To run a high-level program, it must be translated into machine language using a compiler or interpreter

1.9.2. Compiler: Translation Before Execution

  • A compiler is a special program that translates an entire high-level program into machine language before the program is run.
  • The result is a separate machine language file (called an executable), which can then be run any time without needing the original source code or the compiler.
  • Key Features:
    • Fast execution after compilation, Error checking happens before running, Produces a standalone file
  • Example: Languages that use a compiler
    • C, C++, Java (compiled to bytecode), etc.

         

1.9.3. Interpreter: Translation During Execution

  • An interpreter translates and runs the high-level program one instruction at a time.
  • It does not produce a separate machine language file.
  • Every time you run the program, the interpreter must reprocess the source code.
  • Key Features:
    • Easier to test and debug during development
    • Slower execution compared to compiled programs
    • No need for a separate compilation step
  • Example: Languages that use an interpreter
    • Python, JavaScript, Ruby, etc.

         Source Code(program) is feed into the Compiler which converts the code; When the program runs Inputs are entered and Outputs are produced

1.9.3. Compling vs. Interpreting

  • Once program is compiled, it can be executed over and over without the source code or compiler.
  • If it is interpreted, the source code and interpreter are needed each time the program runs
Compiler Interpreter
Processes whole programs at once Processes programs one instruction at a time
Translates programs into binary machine code Executes programs by loading and translating instructions one by one on the fly
Needed only one after the program is completed Runs each time the program is executed
Allows for detection of some errors prior to execution All the errors are caught during execution
Need not be present in RAM during execution Must be in RAM during a program's execution
Compiled programs usually run faster Interpreted programs are usually slower

         

 

Last updated: July 08, 2025