问缺少显式类型(假定为int)

EN

#include <iostream>
#include <conio.h>
#include "Header2.h"

int main()
{
    Thing Implement(1);
    std::cout << "The truth value is: " << Implement.getValue() << std::flush << "/n";

    _getch();
    return 0;
}

#ifndef Object_H_
#define Object_H_

class Thing
{
public:
    Thing(int a);

int getValue();
private:
int truthValue;
};

#endif // Object_H_

#include <iostream>
#include "Header2.h"

Thing::Thing(int a)
{
if (a != 0 || a != 1)
{
    std::cout << "Improper truth value." << std::flush;
}
else
{
    truthValue = a;
}
};

Thing::getValue()
{
return truthValue;
};