#include<stdio.h>intmain(){int*p;printf("Size of pointer: %zu bytes\n",sizeof(p));// 输出: 4 或 8(取决于平台)return0;} 1. 2. 3. 4. 5. 6. 7. 8. 9. 3. 注意事项 4. 示例:使用sizeof关键字 以下是一个综合示例,展示了sizeof关键字在不同数据类型和变量上的应用。 #include<std...
test.c:Infunction‘main’:test.c:6:1:warning:passing argument1of‘strlen’ from incompatible pointer type[enabled bydefault]printf("%d\n",strlen(&arr));^In file included from test.c:2:0:/usr/include/string.h:395:15:note:expected ‘constchar*’ but argument isoftype‘char(*)[7]’ e...
#include <stdio.h> int main() { int *ptr; printf("Size of pointer ptr: %zu bytes\n", sizeof(ptr)); return 0; } 注意事项 sizeof的返回值类型是size_t,这是一个无符号整数类型,定义在头文件<stddef.h>中。 对于数组,sizeof返回的是整个数组所占的内存大小,而不是数组的长度(即元素个数)...
int *integerPointer; char *characterPointer; float *floatPointer; double *doublePointer; Use the sizeof() Method to Get the Size of a Pointer in C The sizeof() method only accepts one parameter. It is an operator whose value is determined by the compiler; for this reason, it is refer...
printf("Size of one element in arr: %zu bytes\n",sizeof(arr[0]));// 指针大小int*ptr = &a; printf("Size of pointer ptr: %zu bytes\n",sizeof(ptr));// 结构体大小structPerson {charname[50];intage; };structPerson person;
意思是,在 GNU C中,指向 void 指针和指向函数的指针支持加法和减法操作。这是通过将 void 或函数的大小视为1来实现的。 因此,sizeof 操作符也可以用于 void 和函数类型,并返回 1。选项 -Wpointer-arith 会在使用这些扩展时发出警告。
(Pointer size doesn't depend on what kind of data type they are pointing too) So the size of the struct should be: (4+8+1+8)=21 Bytes Let's see what compiler is giving using thesizeof() operator. #include <stdio.h>structA {inta;int*b;charc;char*d; ...
Actually a pointer is just a address holder so its size is always that of an int data type,what ever may be the type of pointer.In a 16-bit compiler,its 2 bytes and in 32-bit compiler,its 4 bytes(ie depeds on sizeof(int)) Was this answer useful? Yes Replyshivam...
sizeof乃C/C++中的一个操作符(operator)是也,简单的说其作用就是返回一个对象或者类型所占的内存字节数。 MSDN上的解释为: The sizeof keyword gives the amount of storage, in bytes, associated with a variable or a type (including aggregate types). This keyword returns a value of type size_t. ...
#include <stdio.h> int main() { int *ptr; printf("Size of pointer: %zu bytes\n", sizeof(ptr)); // 通常是指针本身的大小,与平台相关 return 0; } 结构体 #include <stdio.h> struct MyStruct { int a; float b; char c; }; int main() { struct MyStruct s; printf("Size of st...