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A NULL in C is a pointer with 0 value, which cannot be a valid address.
A null in Oracle is the condition of not having a value, such as a field in a row being null, meaning that it does not have a value. This is not the same as zero - zero and null are two different things.
Note, however, that Oracle does not differentiate between a null and a zero length string. This was an error in non-ANSI implementation made many years ago, but it has persisted because fixing it would impact too much "running" code.
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What is the difference between Strings and Arrays in c?
There is no difference. A string is just an array of type char. The only real difference is that we do not need to keep track of the length of a string because strings are null-terminated in C. If a string does not have a null-terminator, then it is just an ordinary array of character values.
What is difference between c and pro c?
C is the computer language bases on K&R's language that has evolved over the years. It includes C++, as extended by Stroustroup.. Pro*C is an Oracle precompiler that will read a C or C++ program, detect Oracle extensions to it, and convert it to native code for subsequent processing by the C or C++ compiler. This involves building the data structures and function calls needed to use Oracle while passing the non-Oracle C or C++ code through intact. The amalgamated code is then processed by the C or C++ compiler and it now works with Oracle.
What is the Difference between override and new keyword in C?
An override is the specialisation of a virtual function. The new keyword instantiates an instance of an object in dynamic memory and returns a reference to that object (or null if the object could be instantiated). Both are used in C++, but not C.
What is the difference between a C plus plus string and a C-style string?
A std::string is an object that encapsulates an array of type char whereas a C-style string is a primitive array with no members. A std::string is guaranteed to be null-terminated but a C-style string is not.
What is the difference between strcpy and strncpy in c language?
strcpy is meant to copy only null-terminated strings. It is probably implemented to copy every byte until it encounters a #0. strncpy() copies n bytes and it adds null termination at the end of the target string.
What is the difference between null pointer ASCII null character and null string?
A null pointer is a pointer which does not point to any valid memory location, and usually contains the binary value "0" to represent this (this is language dependent). The ASCII null character is a character-sized zero value (in ASCII, it is an unsigned byte with a value of 0), and typically represents the end of a string (esp. as in C and C++). A null string is one that is zero characters of usable string data; in a length-based string, this means the length parameter is set to 0, and in an ASCII null-terminated string, means the first character is set to 0.
How do you bring up a HTML document for a Windows Vista?
From a C-program?ShellExecute (NULL, "open", "C:\DIR\INDEX.HTML", NULL, NULL, SW_SHOW);
What is the difference between C and advanced C?
The difference between C and the advanced C is that C is basic. On the other hand, the advanced C is thorough and to the detail.
Difference between C and C programming language?
The C and C programming languages are one and the same. There is no difference between those languages.
In Which language Oracle Developed?
Oracle is developed using C language...
What is the difference between a null pointer and a null macro?
Using a NULL macro to make C portableI'll assume that you're asking your question for C type language programming. A NULL pointer is a pointer that's guarnteed to point to nothing. This may be 0 in a UNIX/Linux system or some other address in another system. Using the NULL macro to set/initialize your pointers will make your programs more portable among systems than using something like the 0.#include char *c = 0; // initialize to NULL--not portablechar *p = NULL; // initialize to NULL as defined in stdio is portableAddendumThe code:char *c = 0;actually is portable because the compiler converts 0's used in a pointer context (cast to a pointer) to the machine's representation of a NULL pointer, which may or may not be all 0 bits. The NULL macro itself might be defined as something like 0 or (void *)0, and both definitions are portable. As a corollary, the following code is also portable:if (!c) {// do something}because it is equivalent to:if (c != 0) {// do something}and the 0 above is converted to a NULL pointer because it is being compared with a pointer.
How will you declare null pointer in C?
#define NULL ((void *)0) /* defined in <stddef.h> */ const char *mynullvar = NULL;
