//原題目：0出發，回到0成功，到達N（North）則失敗：；求成功和失敗的概率 之比例；
```
//
// main.cpp
// leftOrRight210801
//南極0出發,回到0南極則成功；到達N北極掉落
// Created by terry on 2021/8/19.
//Start from the Zero(South),go back Zero is Success, and go Fail N(North) is Fail!
#include
#define times01 1000000 //電腦快可以設置更多，比如百億次實驗
//#define NN 3
**int** NN1=500;
**int** main(**int** argc, **const** **char** \* argv\[\]) {
// insert code here...
//
**int** pIn=0;
**int** zeroSuccess=0; //Success Come bak Zero
**int** NorthFail=0; //Fail to the North WuQiong
**bool** tmpbool; //Bool 0 or 1
**for** (**unsigned** **long** **int** ii=0;ii<times01;++ii) {//for110ii
pIn=0; //初始化
++pIn; //激活 右Right Jump one Time(s);
//
**do** { //do220
Start110:
tmpbool=rand()%2;
**if**(1\==tmpbool) {//if220 //1== Right Jump;
++pIn;
**if**(pIn>=NN1) { NorthFail++; **goto** North880Fail; }
**else** {**goto** Start110;} //這個 else 省略 的話，不影響邏輯
}//if220
**else** **if** (0\==tmpbool) {//if330elseIf
\--pIn;
**if**(pIn<1) {++zeroSuccess; **goto** Zero90ZeroSuccess;}
**else** {**goto** Start110;} //這個 else 省略 也不影響邏輯
}//if330elseIf
**else** { std::cout<<"Error990!";} //這個 else 是冗余的 （多余的）
} **while** (pIn>0 && pIn<=NN1); //do220 //這個條件 也是 冗余的
//
North880Fail:;
Zero90ZeroSuccess:;
}//for110ii
//
std::cout<<"When the Num of Cells總格子數:NN="<< NN1<<":"<<std::endl;
std::cout<<"Run："<< times01<<" times experiments！"<<std::endl;
std::cout<<"回到0的次數Nums go home to Zero Success："<<zeroSuccess<<std::endl;
std::cout<<"Fail to N,掉落于N（North）:"<<NorthFail<<std::endl;
**return** 0; //這句 冗余， 是固定格式…
}//main（）
```
