A program written in the form of zeros and ones i.e, in the machine - readable form is known as machine language program. Machine code is composed of binary numbers. The disadvantage of a machine language is that it is very difficult to write, understand and debug such a program. It is also very slow.
Instead of writing a program in zeros and ones, one can easily write a program in meaningful and easily-memorable alphanumeric symbols. these symbols are known as mnemonics. the programs written in mnemonics are known as assembly language programs which are easier to and faster to use.
Programs written in languages other than machine language are known as source programs. Such programs have to be converted into machine language to make them understandable by computers. A fully compiled or assembled program that is ready to be loaded into the computer is known as an object program.So the translation of the assembly language program into machine language is a must. The program that translates the assembly language program into a machine language program is known as an assembler.
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