COMPILER DESIGN

Detailed explanation-1: -High-level language programs must be translated into machine language before they can be executed. (Machine language instructions are encoded as binary numbers that are meant to be used by a machine, not read or written by people. High-level languages use a syntax that is closer to human language.)

Detailed explanation-2: -Loosely-speaking, computers can only execute programs written in low-level languages. Thus, programs written in a high-level language have to be translated before they can run. This translation takes some time, which is a small disadvantage of high-level languages.

Detailed explanation-3: -The high-level language is easier to understand for the users but the computer can not understand it. High-level language needs to be converted into the low-level language to make it understandable by the computer. We use Compiler or interpreter to convert high-level language to low-level language.

Detailed explanation-4: -High-level language programs must also be translated to machine language before they can be executed. The translator programs that do this are called compilers (Figure 9-4). Compilers for a particular high-level language can be produced for various computers with different machine languages.

Detailed explanation-5: -However, computers cannot understand source code. Before it can be run, source code must first be translated into a form which a computer understands. A translator is a program that converts source code into machine code.