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ANSI C Programming Language

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ANSI C Programming Language Page 14 September 7, 1997 ANSI C Programming Language • A ... C Program Structure Page 16 September 7, 1997 C Program Structure • Programs are composed of one ...

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Copyright 1995 D. Hanson, K. Li & J.P. Singh Computer Science 217: ANSI C Programming Language Page 14 September 7, 1997 ANSI C Programming Language • A small, general-purpose, initially systems programming language • Used for writing the UNIX OS and tools for many computers • Now also very popular for general-purpose computing • A "low-level" language datatypes and control structures are close to those on most machines • Notable features pointer (address) arithmetic and operators all functions are call-by-value simple, 2-level scope structure no I/O or memory management facilities (provided by library routines) "flexible" type structure • History BCPL B C K&R C ANSI C ~1960     ~1970   ~1972       ~1978              ~1988 Copyright 1995 D. Hanson, K. Li & J.P. Singh Computer Science 217: C vs Modula-3 Page 15 September 7, 1997 C vs Modula-3 feature C Modula- 3 safe no yes efficient yes yes garbage collection no yes static typechecking mostly yes enforced interfaces no yes concurrency no yes Huh? widely available yes no everyone knows it yes no software tools yes some good for a summer job yes no Copyright 1995 D. Hanson, K. Li & J.P. Singh Computer Science 217: C Program Structure Page 16 September 7, 1997 C Program Structure • Programs are composed of one or more files each file contains global variables and functions int a, b; /* global variables */ int main(int argc, char *argv[]) { hello(); return 0; } void hello(void) { printf("hello world "); } • Execution begins by calling main ends when main returns (or some function calls the library function exit ) Copyright 1995 D. Hanson, K. Li & J.P. Singh Computer Science 217: Function Definitions Page 17 September 7, 1997 Function Defini ...

Source: www.cs.princeton.edu

 

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