Having the struct with const function, what will be printed as a result of program execution?
#include <iostream>

struct A {
    int val_;

    A(int v) : val_(v) { } 

    void setPrintVal(int v) const
         val_ += v;
         std::cout << val_ << endl;

int main()
   A a(10);
   int value = 20;
The function A::setPrintVal(int v) const is declared as constant, therefore, class members cannot be changed in it. You can work around this error by declaring a member of the class val_ as mutable.

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