数组声明时发生编译器错误? [英] Compiler error on array declaration?

问题描述

我该如何解决这三个错误?

How do I go about fixing these three errors?

• 错误C2057:期望的常量表达式
• 错误C2466:无法分配恒定大小为0的数组
• 错误C2133:"randomTickets":大小未知

出现问题且不喜欢[门票]的行

Line that's having the issue and not liking [tickets]

int randomTickets[tickets][SIZE];

---

//global constants
const int SIZE = 6;                     //This is the number of balls per ticket
const int MAX_WHITE = 58;               //This is the range of the white balls
const int MAX_RED = 34;                 //This is the range of the red balls
const int waysToWin = 9;
int* newAr = new int[SIZE];

int main(int argc, const char * argv[])
{
    int tickets = displayMenu();        //Welcome screen lets you buy tickets
    int spending = tickets * 2;         //Charges you for the tickets
    int randomTickets[tickets][SIZE];
//code

提前感谢您的帮助！

推荐答案

错误C2057:期望的常量表达式

error C2057: expected constant expression

您不能像这样声明 randomTickets ，因为需要在编译时知道数组的尺寸. tickets 不是一个编译时间常数，因此会出现错误.考虑使用 std :: vector< T> :

You can't declare randomTickets like that because the dimensions of the array need to be known at compile time. tickets is not a compile time constant and therefore you have the error. Consider using std::vector<T>:

std::vector<std::vector<int>> randomTickets(tickets, std::vector<int>(SIZE));

或者，您可以嵌套 std :: array ，因为 SIZE 是恒定的，并且在编译时就知道:

Alternatively, you can nest a std::array since SIZE is constant and known at compile time:

std::vector<std::array<int, SIZE>> randomTickets(tickets);

通过修复此错误，可以解决其他错误.

The other errors are resolved by fixing this one.

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