barcode reader for java mobile free download #define kMets #define kReds 1 2 1 2 in Java

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#define kMets #define kReds 1 2 1 2
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#define kPitcher #define kBatter
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struct Pitcher { int strikeouts; int runsAllowed; } ; struct Batter { int runsScored; int homeRuns; } ; struct Player { int type; char name[ 40 ]; int team; union { struct Pitcher struct Batter } u; };
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pStats; bStats;
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CHAPTER 11: Advanced Topics
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Here s an example of a Player declaration:
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struct Player myPlayer;
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Once you created the Player struct, you would initialize the type field with one of either kPitcher or kBatter:
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myPlayer.type = kBatter;
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You would access the name and team fields like this:
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myPlayer.team = kMets; printf( "Stepping up to the plate: %s", myPlayer.name );
Finally, you d access the union fields like this:
if ( myPlayer.type == kPitcher ) myPlayer.u.pStats.strikeouts = 20;
The u was the name given to the union in the declaration of the Player type. Every Player you declare will automatically have a union named u built into it. The union gives you access to either a Pitcher struct named pStats or a Batter struct named bStats. The previous example references the strikeouts field of the pStats field.
unions provide an interesting alternative to maintaining multiple data structures. Try them.
Write your next program using a union or two. If you don t like them, you can return them for a full refund.
Function Recursion
Some programming problems are best solved by repeating a mathematical process. For example, to learn whether a number is prime (see 6) you might step through each of the even integers between 2 and the number s square root, one at a time, searching for a factor. If no factor is found, you have a prime. The process of stepping through the numbers between 2 and the number s square root is called iteration. In programming, iterative solutions are fairly common. Almost every time you use a for loop, you are applying an iterative approach to a problem. An alternative to the iterative approach is known as recursion. In a recursive approach, instead of repeating a process in a loop, you embed the process in a function and have the function call itself until the process is complete. The key to recursion is a function calling itself.
CHAPTER 11: Advanced Topics
Suppose you wanted to calculate 5 factorial (also known as 5!). The factorial of a number is the product of each integer from 1 up to the number, for example:
5! = 5 * 4 * 3 * 2 * 1 = 120
Using an iterative approach, you might write some code like this:
#include <stdio.h> int main (int argc, const char * argv[]) { int i, num; long fac; num = 5; fac = 1; for ( i=1; i<=num; i++ ) fac *= i; printf( "%d factorial is %ld.", num, fac ); return 0; }
NOTE
If you are interested in trying this code, you ll find it in the Learn C Projects folder, under the subfolder named 11.01 - iterate.
If you ran this program, you d see this line printed in the console window:
5 factorial is 120.
As you can see from the source code, the algorithm steps through (iterates) the numbers 1 through 5, building the factorial with each successive multiplication.
A Recursive Approach
You can use a recursive approach to solve the same problem. For starters, you ll need a function to act as a base for the recursion, a function that will call itself. You ll need two things to build into your recursive function. First, you ll need a mechanism to keep track of the depth of the recursion. In other words, you ll need a variable or parameter that changes depending on the number of times the recursive function calls itself.
CHAPTER 11: Advanced Topics
Second, you ll need a terminating condition, something that tells the recursive function when it s gone deep enough. Here s one version of a recursive function that calculates a factorial:
long factorial( long num ) { if ( num > 1 ) num *= factorial( num - 1 ); return( num ); } factorial() takes a single parameter, the number whose factorial you are trying to calculate. factorial() first checks to see whether the number passed to it is greater than 1. If so, factorial() calls itself, passing 1 less than the number passed into it. This strategy guarantees that, eventually, factorial() will get called with a value of 1.
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