Download e-book for kindle: Art of Programming Contest by Ahmed Shamsul Arefin

By Ahmed Shamsul Arefin

ISBN-10: 9843233824

ISBN-13: 9789843233820

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This is a handy notational shortcut which often produces clearer code. (In fact it is often the only way to write the code cleanly. ) It works because an assignment statement has a value, just as any other expression does. Its value is the value of the right hand side. This also implies that we can use multiple assignments like x = y = z = 0; Evaluation goes from right to left. = '\0' c would be set to 0 or 1 depending on whether the character fetched was an end of file or not. ='. When in doubt, or even if not, parenthesize.

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.

Our example gets the character, assigns it to c, and then tests if it's a `\0''. If it is not a `\0', the statement part of the while is executed, printing the character. The while then repeats. When the input character is finally a `\0', the while terminates, and so does main. Notice that we used an assignment statement c = getchar( ) within an expression. This is a handy notational shortcut which often produces clearer code. (In fact it is often the only way to write the code cleanly. ) It works because an assignment statement has a value, just as any other expression does.

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Art of Programming Contest by Ahmed Shamsul Arefin


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