#include <iostream> using std::cout; using std::endl; int main() { int i = 5; const int ic =10; const int *pic = &i;//从右往左定义“pic 是一个指向int类型的、被定义成const对象的指针” i = i+1; pic = pic + 1; // *pic = 2; Error *pic 不能做左值 const int *pic_1 = ⁣ pic_1 = pic_1 + 1; const int * const pic_2 = ⁣ //pic_2 是一个指向const int类型的、被定义成const对象的指针 i = i + 1; // pic_2 = pic_2 + 1;// error assignment of read-only variable 'pic_3' // *pic_2 = 2; //Error *pic_2 不能做左值 const int * const pic_3 = &i; i = i+1; // pic_3 = pic_3 + 1; error assignment of read-only variable 'pic_3' //*pic_3 = 2; //Error *pic_2 不能做左值 // int * const cpi = ⁣ // cpi是一个指向 const int类型,被定义为非const对象的指针 int * const cpi_1 = &i; //cpi_1是一个指向const int 类型,被定义为非const对象的指针 *cpi_1 = 10; // cpi = cpi + 1; return 0; } //End of main
#include <iostream> using std::cout; using std::endl; int main() { int ival = 0; const int ival3 = 1; const int &rval1 = 1.01; int &rval2 = ival; int * const &rval3 = &ival; int *pi = &ival; int * &rval4 = pi; int &rval5 = *pi; //int &* prval1 = pi;//error: cannot declare pointer to 'int&' int * & prval1 = pi;//right const int & ival2 = 1; //const int * & prval2 = &ival3;//error: cannot bind non-const lvalue reference of type 'const int*&' to an rvalue of type 'const int*' const int * const & prval2 = &ival3; //int * & prval3 = &ival;//error: cannot bind non-const lvalue reference of type 'int*&' to an rvalue of type 'int*' const int * & prval3 = &ival;//error: cannot bind non-const lvalue reference of type 'int*&' to an rvalue of type 'int*' //const int * const & prval3 = &ival1; return 0; } //End of main