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When you declare a variable, you can also provide an initial value for the variable at the same time. The format for integer types, floating point types, and pointers is as follows:
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type variable = initializer;
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In this case, the initializer is just an expression. Here are a few examples:
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float int int myFloat = 3.14159; myInt = 9 * 27; *intPtr = &myInt;
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CHAPTER 11: Advanced Topics
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If you plan on initializing a more complex variable, like an array, struct, or union, you ll use a slightly different form of initializer, embedding the elements used to initialize the variable between pairs of curly braces. Consider these two array declarations:
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int myInts[] = { 10, 20, 30, 40 }; float myFloats[ 5 ] = { 1.0, 2.0, 3.0 };
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The first line of code declares an array of four ints, setting myInts[0] to 10, myInts[1] to 20, myInts[2] to 30, and myInts[3] to 40. If you leave out the array dimension, the compiler makes it just large enough to contain the listed data. The second line of code includes a dimension but not enough data to fill the array. The first three array elements are filled with the specified values, but myFloats[3] and myFloats[4] are initialized to 0.0. Here s another example:
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char s[ 20 ] = "Hello";
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What a convenient way to initialize an array of chars! Here s another way to accomplish the same thing:
char s[ 20 ] = { 'H', 'e', 'l', 'l', 'o', '\0' };
Once again, if you leave out the dimension, the compiler will allocate just enough memory to hold your text string, including a byte to hold the zero terminator. If you include the dimension, the compiler will allocate that many array elements, and fill the array with whatever data you provide. If you provide more data than will fit in the array, your code won t compile. Here s a struct example:
struct Numbers { int i, j; float f; }; struct Numbers myNums = { 1, 2, 3.01 };
CHAPTER 11: Advanced Topics
As you can see, the three initializing values were wrapped in a pair of curly braces. This leaves myNums.i with a value of 1, myNums.j with a value of 2, and myNums.f with a value of 3.01. If you have a struct, union, or array embedded in your struct, you can nest a curlywrapped list of values inside another list, for example:
struct Numbers { int i, j; float f[ 4 ]; }; struct Numbers myNums1 = { 1, 2, {3.01, 4.01, 5.01, 6.01} };
An Initializion Example
Here s a bit of sample code. Before you read on, try to guess what the output will look like when this code runs:
#include <stdio.h> #define kArraySize 10
int main (int argc, const char * argv[]) { int i; char s[ kArraySize ] = "Hello"; printf( "i before it is initialized: %d\n\n", i ); for ( i=0; i<kArraySize; i++ ) printf( "s[ i ]: %d\n", s[ i ] ); return 0; }
This code defines an int, without initializing it, as well as a ten-element array of type char, initializing the array to the string "Hello". Here s the output:
i before it is initialized: -1881141193 s[ s[ s[ s[ s[ s[ s[ s[ s[ s[ i i i i i i i i i i ]: ]: ]: ]: ]: ]: ]: ]: ]: ]: 72 101 108 108 111 0 0 0 0 0
CHAPTER 11: Advanced Topics
One lesson to pull from this code is to always initialize your variables, preferably right where they are defined. In the previous example, no harm was done, since we initialized i in the for loop. But suppose we used i in a different way and simply forgot to initialize it. The random nature of uninitialized variables can make bugs very hard to track down. Take a look at this version of the same code:
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