Pascal (Computer program language) 155 Programming 21 Computer programming 13 Data structures (Computer science) 12 Data processing 11 Structured programming 10 Microcomputers 7 IBM Personal Computer 6 BASIC (Computer program language) 5 Computer programs 4 Macintosh (Computer) 4 UCSD Pascal (Computer program language) 4 Computer graphics 3 Electronic digital computers 3 Numerical analysis 3 Object-oriented programming (Computer science) 3 Science 3 Apple II (Computer) 2 Business 2 C (Computer program language) 2 Debugging in computer science 2 Electronic data processing 2 Mathematics 2 Periodicals 2 ALGOL (Computer program language) 1 Abstract data types (Computer science) 1 Ada (Computer program language) 1 Compilers (Computer programs) 1 Compiling (Electronic computers) 1 Computable functions 1