VSCode 自定义C/C++代码片段 高效编程
VSCode 可以很方便的自定义代码片段，一起来把自己常用的代码编成模板吧
操作过程： 1. 依次点击 文件–首选项–用户代码片段，之后效果如图
2.如果你想在所有工作区使用，选择新建全局代码片段
如果你想限定作用域，选择新建文件夹的代码片段
然后给片段文件起个名字，保存
会有以下内容自动生成，这是使用说明，你可以选择全部删掉
{
// Place your Cpp workspace snippets here. Each snippet is defined under a snippet name and has a scope, prefix, body and
// description. Add comma separated ids of the languages where the snippet is applicable in the scope field. If scope
// is left empty or omitted, the snippet gets applied to all languages. The prefix is what is
// used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders.
// Placeholders with the same ids are connected.
// Example:
// "Print to console": {
// "scope": "javascript,typescript",
// "prefix": "log",
// "body": [
// "console.log('$1');",
// "$2"
// ],
// "description": "Log output to console"
// }
}
3.样例代码说明：
这是之前提到的重定向片段
{
"Print to console": {
"scope": "cpp", //作用的语言,可多选，如"c,cpp,javascript,typescript",
"prefix": "fre", //触发器，可自定义
"body": [
"#ifdef LOCAL",
" freopen(\"E:\\\\\\Cpp\\\\\\1.in\", \"r\", stdin);",
" freopen(\"E:\\\\\\Cpp\\\\\\1.out\", \"w\", stdout);",
"#endif",
" $0" //回车后光标位置
],
"description": "Freopen" //名称
}
}
使用示例：输入fre，联想到后回车
注：1. json用"“包裹键与值，输出”"时要用\转义
2. json用\转义，要输出一个\，json里要放两个，
要输出两个\，json里要放六个（别问我为什么，我试到5个还不行的时候都绝望了）
3. 双引号里面的空格都可以打印出来，最好算好空格数，出来排版效果好
4. 触发器最好避开关键字与内置函数名字，长度最好三个字符以上
接下来就是发挥创造力的时候了
- cpp框架
{
"Print to console": {
"scope": "cpp",
"prefix": "cpp",
"body": [
"#include <algorithm>",
"#include <cstdio>",
"using namespace std;",
"const int maxn = 1005;",
"$0",
"int main() {",
"#ifdef LOCAL",
" freopen(\"E:\\\\\\Cpp\\\\\\1.in\", \"r\", stdin);",
" freopen(\"E:\\\\\\Cpp\\\\\\1.out\", \"w\", stdout);",
"#endif",
"",
"",
"",
"",
"",
"",
" return 0;",
"}",
""
],
"description": "A cpp file template."
}
}
- 有限状态自动机框架
{
"Print to console": {
"scope": "cpp",
"prefix": "state",
"body": [
"#include <cstdio>",
"#define Error -1",
"#define Start 0",
"#define Accept 1",
"#define Q1 2",
"#define Q2 3",
"#define Q3 4",
"#define Q4 5",
"",
"int main() {",
"#ifdef LOCAL",
" freopen(\"E:\\\\\\Cpp\\\\\\1.in\", \"r\", stdin);",
" freopen(\"E:\\\\\\Cpp\\\\\\1.out\", \"w\", stdout);",
"#endif",
" int state = Start;",
" char ch;",
" $0",
" while (state != Accept && state != Error) {",
" switch (state) {",
" case Start:",
" break;",
" case Q1:",
" break;",
" case Q2:",
" break;",
" case Q3:",
" break;",
" case Q4:",
" break;",
" ",
" }",
" }",
" if (state == Accept)",
" printf();",
" else",
" printf();",
"",
" return 0;",
"}"
],
"description": "A template of state"
}
}
- scanf框架（我是不是太懒了 /huaji）
{
"Print to console": {
"scope": "cpp",
"prefix": "sca",
"body": [
"scanf(\"%$0\")"
],
"description": "Scanf"
}
}
- printf框架（一懒到底）
{
"Print to console": {
"scope": "cpp",
"prefix": "pri",
"body": [
"printf(\"%$0\");"
],
"description": "Printf"
}
}
- 这是个很好用的格式化输出模板（OJ经常要的每个输出那个空格隔开，但是最后一个后面不能有空格）三改的最简版本哦
{
"Print to console": {
"scope": "cpp",
"prefix": "print",
"body": [
"for (int i = 0; i < n; i++)",
" printf(i ? \" %d\" : \"%d\", $0[i]);",
"putchar('\\n');"
],
"description": "Print"
}
}
- 流式IO的提速模板，OJ破TLE必备
{
"Print to console": {
"scope": "cpp",
"prefix": "ac",
"body": [
"ios::sync_with_stdio(false);",
"cin.tie(0);" //更安全的话应该用nullptr，可是POJ不认 /goutou
],
"description": "Accelerate"
}
}
- INF
{
"Print to console": {
"scope": "cpp",
"prefix": "inf",
"body": [
"const int INF = 0x3f3f3f3f;",
],
"description": "INF"
}
}
0x3f3f3f3f 这个数很有意思，广泛被当作INF用，相似的还有0xbfbfbfbf，被用作 -INF。如果你还不了解，最好去百度下
PS：猜猜0xffffffff和0x7fffffff分别是多少，再用程序打印下。如果错了，你可能需要反思一下自己是否真正理解了16进制数与2进制数的关系和计算机的补码表示法
- LL
{
"Print to console": {
"scope": "cpp",
"prefix": "ll",
"body": [
"typedef long long LL;"
],
"description": "LL"
}
}
- for循环
{
"Print to console": {
"scope": "cpp",
"prefix": "fo",
"body": [
"for(int i=0;i<$0;i++)"
],
"description": "Loop"
}
}
大家如果有好的想法欢迎评论回复(^_^)