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2d barcode generator vb.net Using Dynamic Arrays in Software
EXAMPLE 7.15 Using Dynamic Arrays Recognizing EAN / UCC - 13 In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Creating EAN13 In None Using Barcode printer for Software Control to generate, create EAN 13 image in Software applications. The get() function here creates a dynamic array: void get(double*& a, int& n) { cout << "Enter number of items: "; cin >> n; a = new double[n]; cout << "Enter " << n << " items, one per line:\n"; for (int i = 0; i < n; i++) { cout << "\t" << i+1 << ": "; cin >> a[i]; } } void print(double* a, int n) { for (int i = 0; i < n; i++) cout << a[i] << " "; cout << endl; } int main() { double* a; // a is simply an unallocated pointer int n; get(a,n); // now a is an array of n doubles print(a,n); delete [] a; // now a is simply an unallocated pointer again get(a,n); // now a is an array of n doubles print(a,n); } Scanning EAN 13 In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. Printing EAN-13 In Visual C# Using Barcode generator for .NET framework Control to generate, create EAN13 image in .NET applications. TeamLRN
Creating EAN13 In .NET Framework Using Barcode creation for ASP.NET Control to generate, create EAN 13 image in ASP.NET applications. Paint EAN 13 In Visual Studio .NET Using Barcode printer for Visual Studio .NET Control to generate, create EAN-13 image in .NET applications. CHAP. 7] Print UPC - 13 In VB.NET Using Barcode generator for VS .NET Control to generate, create EAN / UCC - 13 image in VS .NET applications. Bar Code Printer In None Using Barcode generation for Software Control to generate, create barcode image in Software applications. POINTERS AND REFERENCES
Bar Code Drawer In None Using Barcode maker for Software Control to generate, create bar code image in Software applications. Make Data Matrix In None Using Barcode generation for Software Control to generate, create Data Matrix ECC200 image in Software applications. Enter number of items: 4 Enter 4 items, one per line: 1: 44.4 2: 77.7 3: 22.2 4: 88.8 44.4 77.7 22.2 88.8 Enter number of items: 2 Enter 2 items, one per line: 1: 3.33 2: 9.99 3.33 9.99 Inside the get() function, the new operator allocates storage for n doubles after the value of n is obtained interactively. So the array is created on the fly while the program is running. Before get() is used to create another array for a, the current array has to be deallocated with the delete operator. Note that the subscript operator [] must be specified when deleting an array. Note that the array parameter a is a pointer that is passed by reference: void get(double*& a, int& n) This is necessary because the new operator will change the value of a which is the address of the first element of the newly allocated array. Code 39 Extended Maker In None Using Barcode drawer for Software Control to generate, create Code 3 of 9 image in Software applications. UPC Symbol Encoder In None Using Barcode generation for Software Control to generate, create UPC A image in Software applications. 7.10 USING const WITH POINTERS A pointer to a constant is different from a constant pointer. This distinction is illustrated in the following example. EXAMPLE 7.16 Constant Pointers and Pointers to Constants Creating Ames Code In None Using Barcode creator for Software Control to generate, create NW-7 image in Software applications. 1D Barcode Creation In VB.NET Using Barcode encoder for .NET framework Control to generate, create Linear Barcode image in VS .NET applications. This fragment declares four variables: a pointer p , a constant pointer cp, a pointer pc to a constant, and a constant pointer cpc to a constant: int n = 44; // an int int* p = &n; // a pointer to an int ++(*p); // ok: increments int *p ++p; // ok: increments pointer p int* const cp = &n; // a const pointer to an int ++(*cp); // ok: increments int *cp ++cp; // illegal: pointer cp is const const int k = 88; // a const int const int * pc = &k; // a pointer to a const int ++(*pc); // illegal: int *pc is const ++pc; // ok: increments pointer pc const int* const cpc = &k; // a const pointer to a const int ++(*cpc); // illegal: int *cpc is const ++cpc; // illegal: pointer cpc is const UCC.EAN - 128 Generator In Visual Basic .NET Using Barcode printer for Visual Studio .NET Control to generate, create EAN / UCC - 14 image in Visual Studio .NET applications. Recognize EAN / UCC - 13 In .NET Framework Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications. Note that the reference operator * may be used in a declaration with or without a space on either side. Thus, the following three declarations are equivalent: Paint DataMatrix In Java Using Barcode maker for Java Control to generate, create ECC200 image in Java applications. GS1 - 13 Maker In .NET Framework Using Barcode creation for Reporting Service Control to generate, create EAN-13 image in Reporting Service applications. int* p; int * p; int *p; // indicates that p has type int* (pointer to int) // style sometimes used for clarity // old C style GTIN - 13 Generation In Java Using Barcode creation for Java Control to generate, create EAN / UCC - 13 image in Java applications. Barcode Creation In Visual Studio .NET Using Barcode maker for ASP.NET Control to generate, create bar code image in ASP.NET applications. POINTERS AND REFERENCES
[CHAP. 7
7.11 ARRAYS OF POINTERS AND POINTERS TO ARRAYS The elements of an array may be pointers. Here is an array of 4 pointers to type double: double* p[4]; Its elements can allocated like any other pointer: p[0] = new double(2.718281828459045); p[1] = new double(3.141592653589793); p 2.718281828459045 double
We can visualize this array like this. 2 3.141592653589793 The next example illustrates a useful application of double 3 pointer arrays. It shows how to sort a list indirectly by changing the pointers to the elements instead of moving the elements themselves. This is equivalent to the Indirect Bubble Sort shown in Problem 5.12. EXAMPLE 7.17 Indirect Bubble Sort void sort(float* p[], int n) { float* temp; for (int i = 1; i < n; i++) for (int j = 0; j < n-i; j++) if (*p[j] > *p[j+1]) { temp = p[j]; p[j] = p[j+1]; p[j+1] = temp; } } On each iteration of the inner loop, if the floats of adjacent pointers are out of order, then the pointers are swapped. 7.12 POINTERS TO POINTERS A pointer may point to another pointer. For example, char c = 't'; char* pc = &c; char** ppc = &pc; char*** pppc = &ppc; ***pppc = 'w'; // changes value of c to 'w'
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