c++ 语言 这个code 无语法错误 为什么跟我表达的意思不一样 求大神指点

#include <iostream>
using namespace std;
int runMenu()
{   
    cout << endl;
    cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" << endl;
    cout << "      The amazing story generator     " << endl;
    cout << endl;
    cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" << endl;
    cout << " [0] end testing the program          " << endl;
    cout << " [1] display 'about' information      " << endl;
    cout << " [2] read and store data from field   " << endl;
    cout << " [3] generate a random story line     " << endl;
    cout << " [4] save a story line to file        " << endl;
    cout << " [5] load saved story lines from file " << endl;
    cout << "which option would you like (0-5):    " << endl;
}
int main()
{   
    runMenu();
    cin >> option;
    if (option == 0)
    {
        cout << "bye" << endl;
        system("pause");
        return 0
    }
    else if ((option == 1) | (option == 'I'))
    {
        displayInfo();
    }
    return 0；
    system("pause");


}


c++ 萌新 问的问题可能比较低级 望见谅 谢谢
还有一个问题 最近老是碰到 路径不对是怎么个回事？？
求解决方法 谢谢！！