1.1 函数指针(Pointer to Function) 函数指针是一个指针,它指向函数的入口地址。 简单来说,就是用一个指针变量来保存函数的地址,通过这个指针可以间接地调用该函数。 如果是我们特训营学过项目3的老铁,应该非常熟悉了,我们大量回调函数的应用,就必须要用到函数指针。 1.2 指针函数(Function Returning Pointer) 指针...
or, we may need modify a data array by calling a function. And return void. or, we may need modify a data array in a struct, and call a function to modify that data array. We need to transfer into the function the pointer of that struct containing our data array. 1. Transfer into...
编译过程中,会产生如下警告: E:\c\play\function.cpp In function 'int main()': 15 33 E:\c\play\function.cpp [Warning] pointer to a function used in arithmetic [-Wpointer-arith] 16 35 E:\c\play\function.cpp [Warning] pointer to a function used in arithmetic [-Wpointer-arith] 17 35...
we change the value at address pointer by ‘ptr’. But if this would have been a pointer to a constant, then the last line would have been invalid because a pointer to a constant cannot change the value at the address its pointing to. ...
The logical extension of the concept ofpassing a pointer to a functionleads to passing aUnionpointer, i.e., the pointer of amulti-dimensional array, passing the pointer of aself-referential structure, etc., all these have important uses in different application areas such as complex data struct...
f) 一个指向有10个整型数数组的指针( A pointer to an array of 10 integers) g) 一个指向函数的指针,该函数有一个整型参数并返回一个整型数(A pointer to a function that takes an integer as an argument and returns an integer) h) 一个有10个指针的数组,该指针指向一个函数,该函数有一个整型参数...
A pointer to a function may be declared as below. type (*ientifier_for _pointer ) ( types_of_parameters_of_function); The first wordtypein the above declaration refers to thetypeof data that the function returns. Then the parentheses contain the indirection operator (*) followed by the na...
C语言中的函数指针(Pointer to Function) 正如我们在之前的章节中讨论的,指针可以指向C语言中的函数。但是,指针变量的声明必须与函数相同。考虑以下示例,使指针指向函数。 #include <stdio.h>int addition();int main() { int result; int (*ptr)(); ptr = &...
指针数组(pointerarrays),又称为指向指针的指针(pointertopointer)。例如字符指针数组定义为char *name[ 4 ]; 或者char** name;指针数组存储的是指针,使用前必须初始化,有下面两种初始化方式。 一张图区分常量指针和指针常量 常量指针(constpointer)和指针常量(pointerto const)是C++ 初学者容易搞混的部分,我发现...
printf("a + 1 = %d\n", a + 1); printf("&a + 1 = %d\n", &a + 1); printf("*(a + 1) = %d\n", *(a + 1)); printf("*(&a + 1) = %d\n", *(&a + 1)); return 0; } 1. 2. 3. 4. 5. 6. 7.