不务正业系列：初识Quine之C++一种简单实现

科技前沿 • 2025-02-09 09:16 • 阅读 81

大家好，我是讯享网，很高兴认识大家。

偶然听说了Quine，wikipedia上的解释是：

A quine is a non-empty computer program which takes no input and
produces a copy of its own source code as its only output. The
standard terms for these programs in the computability theory and
computer science literature are “self-replicating programs”,
“self-reproducing programs”, and “self-copying programs”.

纯属娱乐写了个C++版本：

讯享网

#include <iostream> #include <string> using namespace std; int main() { char aDoubleQuot = 34; string str[] = { "#include <iostream>", "#include <string>", "using namespace std;", "int main()", "{", " char a = 34;", " string str[] = {", " ", " };", " for (int i = 0; i <= 6;i++) cout << str[i] << endl;", " for (int i = 0; i <= 13; i++) cout << str[7] + aDoubleQuot + str[i] + aDoubleQuot + ',' << endl;", " for (int i = 8; i <= 13; i++) cout << str[i] << endl;", " return 0", "}" }; for (int i = 0; i <= 6;i++) cout << str[i] << endl; for (int i = 0; i <= 13; i++) cout << str[7] + aDoubleQuot + str[i] + aDoubleQuot + ',' << endl; for (int i = 8; i <= 13; i++) cout << str[i] << endl; return 0; }

讯享网

想办法用最简短的语句实现Quine确实很考验思维和代码能力，也有一定难度，这里只是随便玩玩没有深入研究，比起那些写成一行或者使用宏定义的精简代码，这个版本可以说是最浅显最易理解的写法了。

值得注意的大概以下几点：
· 用char 34来代替'\"'，endl代替\n,规避了转义字符的绕来绕去，为了打印出\，则需要\\，如此死循环肯定行不通，其他处理方式又需要额外逻辑判断。
· 将程序分为2部分，一部分负责记录代码，另一部分运行时打印。

不务正业系列：初识Quine之C++一种简单实现

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