What Does Null Mean in C, C and C#

In computer programming, null is both a value and a pointer. Null is a built-in constant that has a value of zero. It is the same as the character 0 used to terminate strings in C. Null can also be the value of a pointer, which is the same as zero unless the CPU supports a special bit pattern for a null pointer. What Is a Null Value? In a database, zero is a value. The value null means that no value exists. When used as a value, null is not a memory location. Only pointers hold memory locations.  Without a null character, a string would not correctly terminate, which would cause problems. What Is a Null Pointer? The C and C programming, a pointer is a variable that holds a memory location. The null pointer is a pointer that intentionally points to nothing. If you dont have an address to assign to a pointer, you can use null. The null value avoids memory leaks and crashes in applications that contain pointers. An example of a null pointer in C is: #include int main() {   Ã‚  int  *ptr NULL;   Ã‚  printf(The value of ptr is %u,ptr);   Ã‚  return 0; } Note: In C, the null macro may have the type void* but this is not allowed in C. Null in C# In C#, null means no object. Information about null and its usages in C# include: You cannot use 0 instead of null in your programs even though null is represented by the value 0.You can use null with any reference type including arrays, strings, and custom types.In C#, null is not the same as the constant zero.