Question

How to declare read only pointer to prevent the pointer to point to something else in C++

Answer 1

#include <iostream>
 
int main() {
    int a = 123;
    int* const p = &a; 
    std::cout << *p << ' ' << a << '\n';
 
    *p = 99;
    std::cout << *p << ' ' << a << '\n';
     
    int b = 905;
    // p = &b; //  error: assignment of read-only variable ‘p’
}
 
 
 
 
/*
run:
 
123 123
99 99
 
*/

 

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