Download Art of Programming Contest by Ahmed Shamsul Arefin PDF

By Ahmed Shamsul Arefin

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The type information goes before the function name (which can make the name hard to see). CHAPTER 3 PROGRAMMING IN C: A TUTORIAL 51 Examples: char f(a) int a; { ... } int *g( ) { ... } struct symtag *lookup(s) char *s; { ... } The function f returns a character, g returns a pointer to an integer, and lookup returns a pointer to a structure that looks like symtag. And if we're going to use one of these functions, we have to make a declaration where we use it, as we did in main above. Notice the parallelism between the declarations struct symtag *lookup( ); struct symtag *psym; In effect, this says that lookup( ) and psym are both used the same way - as a pointer to a structure -- even though one is a variable and the other is a function.

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. For example, x = x & 0177; forms the bit-wise AND of x and 0177, effectively retaining only the last seven bits of x.

The other pointer manipulations are trivial. The only complexity is the set of lines like struct symtag *lookup( ); This brings us to an area that we will treat only hurriedly; the question of function types. So far, all of our functions have returned integers (or characters, which are much the same). What do we do when the function returns something else, like a pointer to a structure? The rule is that any function that doesn't return an int has to say explicitly what it does return. The type information goes before the function name (which can make the name hard to see).

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