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CHAP. 6]
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a[0] = 11.11 a[1] = 33.33 a[2] = 55.55
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The first line declares a to be an array of 3 elements of type double. The next three lines assign values to those elements.
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Arrays are usually processed with for loops. EXAMPLE 6.2 Printing a Sequence in Order
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This program reads five numbers and then prints them in reverse order: int main() { const int SIZE=5; // defines the size N for 5 elements double a[SIZE]; // declares the array s elements as type double cout << "Enter " << SIZE << " numbers:\t"; for (int i=0; i<SIZE; i++) cin >> a[i]; cout << "In reverse order: "; for (int i=SIZE-1; i>=0; i--) cout << "\t" << a[i]; } Enter 5 numbers: 11.11 33.33 55.55 77.77 99.99 In reverse order: 99.99 77.77 55.55 33.33 11.11 The first line defines the symbolic constant SIZE to be 5 elements. The second line declares a to be an array of 5 elements of type double. Then the first for loop reads 5 values into the array, and the second for loop prints them in reverse order.
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The syntax for an array declaration is
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type array-name[array-size];
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where type is the array s element type and array-size is its number of elements. The declaration in Example 6.1
double a[SIZE];
declares a to be an array of 5 elements, each of type double. Standard C++ requires array-size to be a positive integer constant. So it must be either a symbolic constant as in Example 6.1, or an integer literal like this:
double a[5];
Generally, it is better to use a symbolic constant since the same size value is likely to be used in for loops that process the array. 6.3 INITIALIZING AN ARRAY In C++, an array can be initialized with an optional initializer list, like this:
float a[] = {22.2, 44.4, 66.6 }; a
0 1 2
22.2 44.4 66.6
The values in the list are assigned to the elements of the array in the order that they are listed. The size of the array is set to be equal to the number of values in the initializer list. So this single line of code declares a to be an array of 3 floats and then initializes those for elements with the four values given in the list.
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[CHAP. 6
EXAMPLE 6.3 Initializing an Array
This program initializes the array a and then prints its values: int main() { float a[] = { 22.2, 44.4, 66.6 }; int size = sizeof(a)/sizeof(float); for (int i=0; i<size; i++) cout << "\ta[" << i << "] = " << a[i] << endl; } a[0] = 22.2 a[1] = 44.4 a[2] = 66.6 The first line declares a to be the array of 3 elements described above. The second line uses the sizeof() function to compute the actual number of elements in the array. The value of sizeof(float) is 4 because on this machine a float value occupies 4 bytes in memory. The value of sizeof(a) is 12 because the complete array occupies 12 bytes in memory. Therefore, the value of size is computed to be 12/4 = 3.
An array can be zeroed out by declaring it with an initializer list together with an explicit size value, like this:
float a[7] = { 55.5, 66.6, 77.7 };
0 1 2 3 4 6 7
55.5 66.6 77.7 0.0 0.0 0.0 0.0
This array is declared to have 7 elements of type float; then its initializer list initializes the first 3 elements with the given values and the remaining 4 elements with the value 0. EXAMPLE 6.4 Initializing an Array with Trailing Zeros
This program initializes the array a and then prints its values: int main() { float a[7] = { 22.2, 44.4, 66.6 }; int size = sizeof(a)/sizeof(float); for (int i=0; i<size; i++) cout << "\ta[" << i << "] = " << a[i] << endl; } a[0] = 22.2 a[1] = 44.4 a[2] = 66.6 a[3] = 0 a[4] = 0 a[5] = 0 a[6] = 0
Note that the number of values in an array s initializer list cannot exceed its size:
float a[3] = { 22.2, 44.4, 66.6, 88.8 }; // ERROR: too many values!
An array can be initialized to be all zeros by using an empty initializer list. So, for example, the following three declarations are equivalent:
float a[ ] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }; float a[9] = { 0, 0 }; float a[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
But note that this is not the same as using no initializer list. Just as with a variable of fundamental type, if an array is not initialized it will contain garbage values.
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