除了使用赋值操作让一个指针引用一个给定的对象或函数,也可以使用算术运算来修改一个对象指针。当进行指针算术运算(pointer arithmetic)时,编译器会自动在运算中采用指针所指类型的空间大小。 对于指向对象的指针,可以进行下列的运算: (1)对一个指针执行整数加法和减法操作。 (2)两个指针相减。 (3)比较两个指针。
指针算法(Pointer arithmetic) 正如主要章节中所解释的,Objective-C指针是一个地址,它是一个数值。 因此,您可以像对数值一样对指针执行算术运算。 可以在指针上使用四个算术运算符:++, - ,+和 - 要理解指针运算,让我们考虑ptr是一个整数指针,它指向地址1000.假设32位整数,让我们对指针执行以下算术运算 - ptr++...
Since void is an incomplete type, it is not an object type. Therefore it is not a valid operand to an addition operation. Therefore you cannot perform pointer arithmetic on a void pointer. Notes Originally, it was thought that void* arithmetic was permitted, because of these sections of the...
Sometimes we need to perform arithmetic operations on pointers. Pointer arithmetic is slightly different from arithmetic we normally use in our daily life.
http://stackoverflow.com/questions/3523145/pointer-arithmetic-for-void-pointer-in-c When a pointer to a particular type (say int, char, float, ..) is incremented, its value is increased by the size of that data type. If a void pointer which points to data of size x is incremented, ...
The size of data types influences pointer arithmetic. For anintpointer, incrementing it moves it forward by 4 bytes (typically), but for acharpointer, it moves by 1 byte. Arrays and Pointer Arithmetic Arrays in C can be accessed using pointers. The name of the array is essentially the ad...
Working on a program to split strings into smaller strings with trailing whitespace removed, in an attempt to fully get knowledge of pointers in my head. However, when I try and do pointer arithmetic on a array of pointers, I keep getting a segmentation
pointer n.指针 natural language 自然语言 array n.数组矩阵, source text 源文本 subscript n.下标 intermediate language 中间语言 type conversion 类型转换 software development 软件开发 address arithmetic 地址运算 map vt.映射,计划 denote vt.指示,表示 maintenance cost 维护费用 subprogram n...
If we increment a pointer by 1, the pointer will start pointing to the immediate next location. This is somewhat different from the general arithmetic since the value of the pointer will get increased by the size of the data type to which the pointer is pointing. ...
Pointer arithmetic There are four arithmetic operators that can be used in pointers: ++, --, +, - 2 Array of pointers You can define arrays to hold a number of pointers. 3 Pointer to pointer C allows you to have pointer on a pointer and so on. 4 Passing pointers to functions in...