赛马程序，忽略函数调用

打印出代码时，它会运行，但似乎没有运行coinflip()函数。目前只尝试打印出第一根马绳，随机向前移动。

#include <iostream>
#include <string>
#include <time.h>
#include <stdlib.h>
using namespace std;
string h0 = "0................";
string h1 = "1................";
string h2 = "2................";
string h3 = "3................";
string h4 = "4................";
int position0 = 0;
string coinflip0(string h0);
int main(){
cout << "Press Enter to begin! " <<endl;
cin.ignore();
std::cout << h0 << endl; //print string
cout << h1 << endl;
cout << h2 << endl;
cout << h3 << endl;
cout << h4 << endl;
//      srand(time(NULL));//time goes back to zero for each loop
while(h0.at(16) != 0) {
cout << "n Press Enter to continue " << endl;
cin.ignore();
string coinflip0(h0); // call function
cout << h0 << endl; //print new string
} //end while
} // end main
string coinflip0(string h0) {
// find random number(0 or 1)
int num = rand() % 2;
cout << num << endl;
position0 = position0 + num;
if(num==1){
std::swap(h0[position0], h0[position0+1]);
} // end if
return h0;
}//end coin flip

输出：

Press Enter to begin!
0................
1................
2................
3................
4................
Press Enter to continue
0................
Press Enter to continue
0................
Press Enter to continue
0................
Press Enter to continue