sizeof

1. The result type of the sizeof operator is size_t. In the header file, typedef is of the unsigned int type. This type ensures that it can accommodate the maximum object size. 2. sizeof is an operator (C ++ keyword) and strlen is a function. 3.

sizeof function:The number of bytes, such as the int type is 4 bytes under the 32 platform, Char is 1 bytes, and any type of pointer is 4 bytes.Stelen function:The length of the string, not including '/'.The following is an example of distinguishing

Array type (two-dimensional)#include int main (){int a[3][4] = {0};printf ("%d\n", sizeof (a));printf ("%d\n", sizeof (a[0][0]));printf ("%d\n", sizeof (a[0]));printf ("%d\n", sizeof (a[0]+1));printf ("%d\n", sizeof (a+1));printf ("%d\n", sizeof (&a[

One, the perennial is mistaken for functions. sizeof is the keyword is not a function, in fact, even if you do not know whether it is 32 keywords, we can also use the compiler to determine its identity. Look at the following example:int i=0;A),

sizeof operators and size_t types The role of *sizeof sizeof is one of the operators of C, which is used to get the amount of memory space that the operand is allocated in byte units. The operands here can be variables or data types such as

First, we need to make it clear that sizeof is neither a function nor an unary operator. It is a special keyword similar to macro definition, sizeof (). It is not compiled during the internal compilation process of parentheses, instead, it is

Programmer --- C language details 26 (boolean type, continue details in C language, sizeof example, strlen example)Main Content: boolean type, continue details in C language, sizeof example, strlen exampleI. boolean type Many people may not know

is sizeof a key word?sizeof is the key word , which is beyond doubt. You cannot define sizeof as any identifier. See the instructions in the C language standard documentation:Does sizeof have an operator (operator)?In C,sizeof is an operator

From the perspective of external features: # Include # include int main () { char array [] = "12345"; int n = sizeof (array ); // n is 6 int M = strlen (array); // m is 5 array [3] = 0; N = sizeof (array); // n is 6 M = strlen

How to use enumeration types: Enum is a custom type of C language An enum value is an integer value that can be customized as needed The value of the first enum defaults to 0 By default, the enum value is based on the previous

Sizeof & strlen difference, sizeof Function This article mainly records the differences between the sizeof operator and strlen () function, and their respective uses. (If you find any mistakes, leave a message to correct them)Differences between

Need to add:1. Note that the virtual function has a pointer of 4 bytes. (32-bit machine, of course)#include #include#include#includestring.h>using namespacestd;classA { Public: Const intA;};classB {};classC { Public: ~C () {}};classB | PublicC

I. Introduction in the previous article, we created a window from scratch. One important step is to register the window class, such as the following code://Register window class bool Register (LPSTR lpclassname, WNDPROC WNDPROC) {wndclassex WCE = {0}

About the sizeof Operator We often use sizeof in C programming, especially during the examination, this is often a required knowledge point. Next, let me talk about some problems of sizeof in programming and let friends know what it is when they

1. The result type of the sizeof operator is size_t, and typedef in the header file is of the unsigned int type. This type ensures that it can accommodate the maximum object size. 2. sizeof is an operator and strlen is a function. 3. sizeof can

sizeof usageLet's start by stating that sizeof is a C-language operator that executes at compile time, just like normal + 、-、 *.sizeof has two grammatical forms: 1, sizeof (object) or sizeof object 2, sizeof (type) (can be abstract type or generic

In the C language, you will often seeenum, sizeof, typedef, let's explain three of them today.First, the enum is a custom type in the C language, which is an enumeration type. The enum value is an integer value that can be customized as needed, and

I encountered a small computation during the C ++ review. I still have a lot of knowledge. Let's start with your attention! Char * str1 = "absde"; char str2 [] = "absde"; char str3 [8] = {'A' ,}; char ss [] = "0123456789 "; why sizeof (str1) = 4

In C + +, sizeof is a frequently asked concept, such as the following several aspects of sizeof's face test repeatedly appeared in the major IT companies in the technical interview, we need to fully understand and grasp.Note: I was asked this

【1"What is the difference between strlen and sizeof?" (1The result type of the sizeof operator is size_t, which is a typedef of unsigned in the header fileinttype. This type guarantees that the byte size of the largest object being built can be