Question

C++编程问题，求大神帮忙

#include<iostream>
#include<cstring>

class Stock
{
private:
char company[30];
int shares;
double share_val;
double total_val;
void set_tot(){ total_val = shares*share_val; }

public:
void acquire(const char*co, int n, double pr);
void buy(int num, double price);
void sell(int mun, double price);
void update(double price);
void show();
};

void Stock::acquire(const char*co, int n, double pr)
{
std::strncpy(company, co, 29);
company[29] = '\0';
if (n < 0)
{
std::cerr << "Number of share can't be negative."
<< company << " share set to 0.\n";
shares = 0;
}
else
shares = n;
share_val = pr;
set_tot();
}

void Stock::buy(int num, double price)
{
if (num < 0)
{
std::cerr << "Number of shares purchased can't be negative"
<< "Transaction is aborted.\n";
}
else
{
shares += num;
share_val = price;
set_tot();
}
}

void Stock::update(double price)
{
share_val = price;
set_tot();
}

void Stock::show()
{
using std::cout;
using std::endl;
cout << "Company:" << company
<< " shares: " << shares << endl
<< " Share Price:&" << share_val
<< "Total Worth:$" << total_val << endl;
}

int main()
{
using std::cout;
using std::ios_base;
Stock stock1;
stock1.acquire("NanoSmart", 20, 12.50);
cout.setf(ios_base::showpoint);
stock1.show();
stock1.buy(15, 18.25);
stock1.show();
stock1.sell(400, 20.00);
stock1.show();
return 0;

}
这是一个简单的C++程序，我定义了一个类，其他地方都没有问题，就是在编译的时候说strncpy（）函数在VS2013中被认为是不安全的，于是我在程序开头加了一行#define _CRT_SECURE_NO_WARNINGS,但还是报错，该怎么办？

Answer 1

strncpy是不安全，它不检查边界，所以建议在vs中就用CString。如果只是练手，可以自己写个strncpyX函数来替代原来的

Answer 2

都是一些缺少分号，变量没有定义的小问题，有全部代码一下子就找出来了
希望能解决您的问题。