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面向对象程序设计单选题中等

C++中,对一维数组进行赋值,哪一种方式是合法的?

Aint arr[3]; arr = {1,2,3};
Bint arr[3] = {1,2,3};
Cint arr[3]; for (int i=0; i<3; i++) arr[i] = i;
Dint arr[3]; arr[0] = 1, arr[1] = 2, arr[2] = 3;