C++引用

 
int a=1;
const int b=4;
int& ref_a;//必须初始化 :declared as reference but not initialized
const int& ref_a_const=a;
ref_a++;
ref_a_const++;//只读的：increment of read-only reference ‘ref_a_const’
int&    ref_b=b;//类型不匹配： invalid initialization of reference of type ‘int&’ from expression of type ‘const int’
const int& ref_b_const=b;
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