[Linux] Linux折腾记（六）：感悟GNU C及把Vim打造成C/C++的半自动化IDE

int * __restrict__ p = (int*)malloc(100*sizeof(int));

int arr[100];
int* pArr;
pArr = arr;

void func1(void* p1, void* p2, void* p3, int size){
for(int i=0; i<size; i++){
p3[i] = p1[i] + p2[i];
}
}

void func1(void* __restrict__ p1, void* __restrict__ p2, void* __restrict__ p3, int size){
for(int i=0; i<size; i++){
p3[i] = p1[i] + p2[i];
}
}

#include <stdlib.h>
#include <stdio.h></p> <p>int main(){
__complex__ a = 3 + 4i;
__complex__ b = 5 + 6i;
__complex__ c = a + b;
__complex__ d = a * b;
__complex__ e = a / b;
printf("a + b = %f + %fi\n", __real__ c, __imag__ c);
printf("a * b = %f + %fi\n", __real__ d, __imag__ d);
printf("a / b = %f + %fi\n", __real__ e, __imag__ e);
return 0;
}

#include <stdlib.h>
#include <stdio.h></p> <p>int main(){
int* p = (int*)malloc(100*sizeof(int));
int arr[100] = {0};
printf("The size of p: %d\n", sizeof(p));
printf("The size of arr: %d\n", sizeof(arr));
return 0;
}

The size of p: 8
The size of arr: 400

int arr[100];
size_t length = sizeof(arr)/sizeof(int);

#include <stdlib.h>
#include <stdio.h></p> <p>void test_array(int arr[]){
printf("The size of arr in function: %d\n", sizeof(arr));
return;
}</p> <p>int main(){
int arr[100] = {0};
printf("The size of arr in main: %d\n", sizeof(arr));
test_array(arr);
return 0;
}

The size of arr in main: 400
The size of arr in function: 8

struct point;
char name[0];

struct point{
int x,y;
};

struct linked_list{
struct linked_list* next;
int x;
/*other elements here perhaps */
}
struct linked_list* head;

#include <stdlib.h>
#include <stdio.h></p> <p>typedef struct {
int length;
int arr[0];
} incomplete_type;</p> <p>int main(){
char hello[] = "Hello, world!";
int length = sizeof(hello) / sizeof(char);
incomplete_type* p = (incomplete_type*)malloc(sizeof(int) + length*sizeof(char));
p->length = length;
for(int i=0; i<p->length; i++){
p->arr[i] = hello[i];
}
printf("p->length=%d\n", p->length);
printf("p->arr=%s\n", p->arr);
}

分别介绍一下这几个插件。The-NERD-tree是一个浏览目录和文件的插件，可以使用:help NERD_tree.txt查看它的帮助文档。taglist.vim是浏览符号以及在符号之间跳转的插件，使用:help taglist.txt查看它的帮助文档。a.vim是在源代码文件和头文件之间跳转的插件，不需要帮助文档，它的命令就是:A。c.vim是提供IDE功能的主要插件，它提供的功能有自动注释、反注释、自动插入代码块及自动运行，如果安装了splint，还可以对代码进行静态检查，使用:help csupport.txt查看它的文档。OmniCppComplete是一个提供自动补全功能的插件，使用:help omnicppcomplete.txt查看它的文档。