Download Art of Programming Contest by Ahmed Shamsul Arefin PDF

By Ahmed Shamsul Arefin

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It's an excellent practice to write programs without any literal constants except in #define statements. There are several warnings about #define. First, there's no semicolon at the end of a #define; all the text from the name to the end of the line (except for comments) is taken to be the ``something''. When it's put into the text, blanks are placed around it. The other CHAPTER 3 PROGRAMMING IN C: A TUTORIAL 54 control word known to C is #include. To include one file in your source at compilation time, say #include "filename" Bit Operators C has several operators for logical bit-operations.

To avoid them, first, define and initialize each external variable only once in the entire set of files: int foo = 0; You can get away with multiple external definitions on UNIX, but not on GCOS, so don't ask for trouble. Multiple initializations are illegal everywhere. Second, at the beginning of any file that contains functions needing a variable whose definition is in some other file, put in an extern declaration, outside of any function: extern int foo; f1( ) { ... } etc. #define, #include C provides a very limited macro facility.

But x = k++; CHAPTER 3 PROGRAMMING IN C: A TUTORIAL 36 first sets x to to 5, and then increments k to 6. The incrementing effect of ++k and k++ is the same, but their values are respectively 5 and 6. We shall soon see examples where both of these uses are important. Arrays In C, as in Fortran or PL/I, it is possible to make arrays whose elements are basic types. Thus we can make an array of 10 integers with the declaration int x[10]; The square brackets mean subscripting; parentheses are used only for function references.

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