Low level (Assembly) languages are difficult for programmers to develop code and to test and modify it. Simple tasks need a lot of instructions. High level languages started to be developed in the mid 1950s. FORTRAN (FORmula TRANslator); mainly used for engineering/scientific computing. COBOL(Common Business Orientated Language). Still one of the main commercial data processing languages. ALGOL (ALGOrithmic Language) was also developed in the 1950s and many of the languages such as C and C++ are developed from it. BASIC (Beginners All-purpose Symbolic Instruction Code) was developed in the 1960s as a simple programming language. PASCAL was developed in the 1970s as a well-structured teaching language. Other high-level languages include : LISP, PROLOG, PL/1 , ADA.
In procedural languages a sequence of commands is given. Each command is an action which needs to be carried out. Traditional languages such as FORTRAN, COBOL, BASIC and PASCAL are procedural languages.
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