通过sizeof 可以计算数组的元素个数。 示例: #include <stdio.h> int main() { int arr[10]; printf("Size of array: %zu bytes\n", sizeof(arr)); printf("Size of one element: %zu bytes\n", sizeof(arr[0])); printf("Number of elements in array: %zu\n", sizeof(arr) / sizeof...
// printf("整型指针数组%s的地址是:%p\n", arrayName, pointerOfArray); // printf("打印整型指针数组%s:\n", arrayName); //定义一个左值指针变量,以便进行指针运算 int * * pArr = pointerOfArray; // printf("\n以函数内的pArr为指针,以 * (pArr + i)为指针的方式打印字符指针数组%s:~~~\n...
在C语言中,sizeof是一个编译时操作符,用于获取数据类型或变量在内存中占用的字节数。它可以用于基本数据类型(如int、char等)、结构体、联合体以及指针等。使用sizeof可以帮助程序员了解数据在内存中的布局和大小,从而进行更有效的内存管理。 基本用法 获取基本数据类型的大小: #include <stdio.h> int main() { ...
Number of elements in array:10Size ofstruct:16bytes Size of variable s:16bytes Size of pointer:8bytes 1. 2. 3. 4. 5. 6. 7. 8. 5. 总结 sizeof关键字在C语言中用于计算数据类型或变量在内存中占用的字节数。它是一个编译时操作符,对性能没有影响。sizeof可以用于基本数据类型、数组、结构体、...
#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...
A declaration of a parameter as ''array of type'' shall be adjusted to ''qualified pointer to...
cout<<"The size of a char is:"<<sizeof(char)//1<<"\nThe length of"<< szHello <<"is:"<<sizeof(szHello)//6,字符串大小 = 本身字符 + '\0'<<"\nThe size of the pointer is"<< getPtrSize(szHello) << endl;//4 ,当64位机时,指针位8字节cout<<"The size of a a array is...
*** WARNING 259 IN LINE 15 OF P.C: pointer: different mspace 16 1 p3 = p4; /*...
There is no way for a pointer to know whether it points to one object or element in an array. Naturally, it can't have the info about lenght of array. C-strings are arrays ofcharthat have terminatingnull. Thestrlen()iterates from given address until it encounters that null. ...
This rule finds expressions that take the size of a function parameter of array type. In C, function parameters of array type are treated as if they had the corresponding pointer type, so their size is always the size of the pointer type (typically either four or eight). In particular, ...