获取一个双值存储值C++

Question

只是想知道这是什么问题。如果它为NULL，则Double in设置为50。然后在它被设置为50之后，它将与analyet（）的用户输入一起被减去。但是在循环它之后它仍然认为double in是NULL。任何一个人都可以指引我朝着正确的方向去记住自己与自己相处的价值。

#include <iostream> 
#include <string> 


using namespace std; 


class Bet 
{ 
public: 
void set_stack(double n); 
void set_bet(double n); 
void analyze(); 
double get_stack(); 
double get_bet(); 

private: 
double pCount; 
double bet; 
}; 

void Bet::analyze() 
{ 
double p = pCount; 
double b = bet; 
double z = p - b; 

pCount = z ; 
} 

void Bet::set_bet(double n) 
{ 
double z = n; 
bet = z; 

} 
double Bet::get_bet() 
{ 
return bet; 
} 


void Bet::set_stack(double n) 
{ 

double z = n; 

pCount = z; 
} 


double Bet::get_stack() 
{ 
double p = pCount; 
double b = bet; 


double z = p - b; 

return z; 
} 
double bbet; 
double in ; 
double* inV; 

int main() 
{ 


bool con = true; 
while(con){ 
double start = 50; 


if(*inV == NULL){ 
in = start;} 



Bet rr; 
rr.set_stack(in); 


cout << "Enter min 1 Bet: "; 
cin >> bbet; 

rr.set_bet(bbet); 


double newStack = rr.get_stack(); 

cout << "Stack: " << newStack << endl; 
cout << "Bet: " << bbet << endl; 
inV = &in; 
} 

system("pause"); 
return 0; 
} 

Answer 1

想要if (inV == NULL)而不是if (*inV == NULL)。