C++错误初始化数组

Question

我想初始化数组car.places[2][3]但数组中始终为零。请有人告诉我我做错了什么，这是代码:

#include <iostream>
#include <string>

using namespace std;

class reserv
{
public:
  int places[2][3];
} car;


int main () {

car.places[2][3] = (
            (1, 2, 3),
            (4, 5, 6)
        );

for(int i=0;i<2;i++)
{
    for(int j=0;j<3;j++)
    {
      cout << i << "," << j << " " << car.places[i][j] << endl;
    }
}

    return 0;
}

我从编译器收到警告:

>g++ -Wall -pedantic F_car_test.cpp
F_car_test.cpp: In function 'int main()':
F_car_test.cpp:16:11: warning: left operand of comma operator has no effect [
-Wunused-value]
       (1, 2, 3),
           ^
F_car_test.cpp:16:14: warning: right operand of comma operator has no effect
[-Wunused-value]
       (1, 2, 3),
              ^
F_car_test.cpp:17:11: warning: left operand of comma operator has no effect [
-Wunused-value]
       (4, 5, 6)
           ^
F_car_test.cpp:17:14: warning: right operand of comma operator has no effect
[-Wunused-value]
       (4, 5, 6)
              ^

提前致谢

Answer 1

你不能在没有循环的声明之后做这件事。

这是在循环中执行的方法:

for (int i = 0; i < 2; ++i) {
    for (int j = 0; j < 3; ++j) {
        car.places[i][j] = 1 + 3 * i + j;
    }
}