Question

如何使用生成随机枚举变量的rand函数？这是我到目前为止（它正在吐出垃圾数字）：

enum pieces { FLAG = 'F', BOMB = 'B', MARSHAL = '1', GENERAL = '2', COLONEL = 
              '3', MAJOR = '4', CAPTAIN = '5', LIEUTENANT = '6', SERGEANT = 
              '7', MINER = '8', SPY = 'S' };

int gamePieces[12] = { FLAG, BOMB, MARSHAL, GENERAL, COLONEL, MAJOR, 
                       CAPTAIN, LIEUTENANT, SEGEANT, MINOR, SPY };

int rand_piece = (rand()& gamePieces[12];

Answer 1

可能严格来说是不可能的。你可以

检查这些枚举中的值是什么值
然后你就可以生成一个整数
对其进行模数（％）
解析为枚举[编辑 - 您不必将其解析为C ++中的枚举]

例如

#include <iostream>
#include <stdlib.h>  
using namespace std;

int main()
{
   enum gamePieces { FLAG, BOMB, MARSHAL, GENERAL, COLONEL, MAJOR, 
                       CAPTAIN, LIEUTENANT, SEGEANT, MINOR, SPY };

   int maxEnumValue = 12;
   int randPiece = rand() % maxEnumValue;
   cout << randPiece;
}

Answer 2

您可以使用rand() % 12，这将创建一个0-11范围内的随机数：

int rand_piece = gamePieces[rand() % 12];

您的代码中存在更多错误 - 请尝试以下操作：

#include <stdlib.h>

const int numPieces = 11;

enum pieces { FLAG = 'F', BOMB = 'B', MARSHAL = '1', GENERAL = '2', COLONEL = 
              '3', MAJOR = '4', CAPTAIN = '5', LIEUTENANT = '6', SERGEANT = 
              '7', MINER = '8', SPY = 'S' };

int gamePieces[numPieces] = { FLAG, BOMB, MARSHAL, GENERAL, COLONEL, MAJOR, 
                       CAPTAIN, LIEUTENANT, SERGEANT, MINER, SPY };

int rand_piece = gamePieces[rand() % numPieces];

或者，如果您不需要额外的价值：

enum pieces { FLAG, BOMB, MARSHAL, GENERAL, COLONEL, MAJOR, 
              CAPTAIN, LIEUTENANT, SERGEANT, MINER, SPY,
              MAX_PIECE };

int rand_piece = rand() % MAX_PIECE;

Answer 3

尝试：

int main()
{
    enum pieces {
        FLAG = 'F', BOMB = 'B', MARSHAL = '1', GENERAL = '2', COLONEL =
        '3', MAJOR = '4', CAPTAIN = '5', LIEUTENANT = '6', SERGEANT =
        '7', MINER = '8', SPY = 'S'
    };

    int gamePieces[11] = { FLAG, BOMB, MARSHAL, GENERAL, COLONEL, MAJOR,
        CAPTAIN, LIEUTENANT, SERGEANT, MAJOR, SPY };


    std::cout << char(gamePieces[rand() % 11]) << std::endl;
    std::cout << char(gamePieces[rand() % 11]) << std::endl;
    std::cout << char(gamePieces[rand() % 11]) << std::endl;
    std::cout << char(gamePieces[rand() % 11]) << std::endl;
    std::cout << char(gamePieces[rand() % 11]) << std::endl;

    return 0;
}

打印：

如何在rand（）函数中使用枚举值

3 个答案: