microsoft reporting services qr code INITIALIZING AN ARRAY in Software

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5.3 INITIALIZING AN ARRAY
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In C++, an arrays can be initialized with a single initializer list, like this:
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float a[41 = (22.2, 44.4, 66.6, 88.8);
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The values in the list are assigned to the elements of the array in the order that they are listed.
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EXAMPLE 5.3 Initializing an Array
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This shows how to initialize an array explicitly:
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main0 1 double a[4] = (22.2, 44.4, 66.6, 88.8); for (int i = 0; i < 4; i++) tout << ~~a[~~ << i << "1 = " << a[i] X-C 1
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endl;
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d31 = 2 2 . 2 af13 = 4 4 . 4 a[21 = 6 6 . 6
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alI31 = 88.8
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ARRAYS
[CHAP. 5
The array s initializer list contains 4 values, the same number as the size of the array specified in the array s declaration.
If the array has more elements than values listed in its initializer list, then the remaining elements are initialized to zero.
EXAMPLE 5.4 Here the may has 4 elements, but its initializer list has only 2 values:
main0 -t double a[4] = (22.2, 44.4); for (int i = 0; i c 4; i++) tout CC "a[" -CC i CC "1 = ' CC
a[i]
CC endl;
The last 2 elements, which are not given values from the initializer list, are assigned the default value 0.
If an array declaration does not include an initializer list, then its elements may contain unexpected garbage values.
EXAMPLE 5.5 Here the array has no initializer:
main0 { double a[4]; for (int i = 0; i c 4; i++) tout CC "a[" CC i CC "1 = ' CC a[i] CC endl; ~~~~~,-3~Q : . 1 _..y:: / ,_ 1 . a[03 23 2, , -:., . ..:&i.j. =* ..i+j &.154.&&2~8$ .j, _ 1 .:.;, : ,, gra ] jg . .3..3.5-5fj+.,3.~&. . .. . , ; ;. . ., ( _ . _ . . . . : _ .a [ YJ 1 -=, ,y ; $8*8g#$~jj$ - . : . . . : I , : : ., s .: : _ :., . r -. :. : _, ,-. ., I. ; . _ , .,.:,]:.., 1,. _ ; , _, .: -, - ,: : .y ,, . , :, . : , ;. , .:... . , ;. : . . . : . , . , ;
The contents of the uninitialized array are unpredictable.
When an array has an explicit initialization, its size specifier may be omitted from its declaration. For example, in the program in Example 5.6, the declaration
float a[41 = (22.2, 44.4, 66.6, 88.8);
is equivalent to the declaration
float a[] = (22.2, 44.4, 66.6, 88.8);
The size is determined to be the number of values in the initializer list.
CHAP. 51
ARRAYS
5.4 PASSING AN ARRAY TO A FUNCTION The code f loa t a [ 1 that is used to declare an array with an initializer list tells the compiler two things: the name of the array is a, and the array s elements will have type float. The symbol a stores the array s memory address. So the code float a [ 1 provides all the information that the compiler needs to declare the array. The size of the array (i. e., the number of elements in the array) does not need to be conveyed to the compiler. The code that is used to pass an array to a function includes the array s element type and its name. This is illustrated in the next example. It includes two functions that process arrays. In both parameter lists, the array a[] is declared in the parameter list as
double a[]
The actual number of elements has to be passed by means of a separate integer variable. When a function is passed an array this way, it is actually passed only the address of the memory cell where the array starts. This value is represented by the array s name a. The function can then change the contents of the array by directly accessing the memory cells where the array s elements are stored. So, although the name of the array is passed by value, its elements can be changed just as if they had been passed by reference.
EXAMPLE 5.6 Array I/O Functions This program illustrates how arrays are passed to functions:
const int size = 100; void getArray(double [I, int&); void printArray(const double [I, const int); main0 1 double a[size]; int n; getArray(a,n); tout << "The array has ' C-C n CC ' elements.\nThey are:\n"; printArray(a,n);
void getArray(double a[], int& n) n = 0; tout << "Enter data. Terminate with O:\n"; for (n = 0; n < size; n++) { tout CC n << 'I: "; tin >> a[n]; if (a[n] == 0) break;
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