Question

Can someone help run this and fix a small error I have when I run this. I get a constant variable error on line 62. I have a constant variable though and I'm sure what to change. I use Visual Basic 2017 as well for any of those wondering.
Please help and thanks in advance

#include <ctime>
#include <iostream>
#include <random>
#include <string>
using namespace std;

int main()
{
const int paper = 0, rock = 1, scissors = 2;
const string explanationPR = " wins because paper covers rock";
const string explanationRS = " wins because rock breaks scissors";
const string explanationSP = " wins because scissors cut paper";

// default_random_engine e(static_cast(time(nullptr)));
default_random_engine e;
uniform_int_distribution u(paper, scissors);
top:
int choiceA = u(e), choiceB = u(e);
const string nameA = "Ala", nameB = "Bel";
cout << nameA << " chooses ";
switch(choiceA){
case paper: cout << "paper";
break;
case rock:cout << "rock";
break;
case scissors: cout << "scissors";
break;
}
cout << endl;
cout << nameB << " chooses ";
switch(choiceB){
case paper: cout << "paper";
break;
case rock:cout << "rock";
break;
case scissors: cout << "scissors";
break;
}
cout << endl;

switch(choiceA) {
case paper: switch(choiceB){
case rock: cout << nameA << explanationPR << endl;
case scissors: cout << nameB << explanationSP << endl;
break;
}
case rock: switch(choiceB){
case paper: cout << nameB << explanationSP << endl;
case scissors: cout << nameA << explanationRS << endl;
break;
}
case scissors: switch(choiceB){
case paper: cout << nameA << explanationSP << endl;
case rock: cout << nameB << explanationRS << endl;
break;
}
case choiceB:
cout << "Tie game";
default:
cout << "something is wrong";
cout << endl;
break;
}

system("pause");
return 0;
}

Answer 1

It was really confusing took me 2 hours but, with hit and trial I found out that In the 10th line from end on the program.

case choiceB:
cout << "Tie game";

is causing the error.

Also your way of choosing the Values is little confusing.

Corrected code:

#include <ctime>
#include <iostream>
#include <random>
#include <string>
#include <chrono>
using namespace std;

int main() {
    const int paper = 0, rock = 1, scissors = 2;
    const string explanationPR = " wins because paper covers rock";
    const string explanationRS = " wins because rock breaks scissors";
    const string explanationSP = " wins because scissors cut paper";


    unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
    default_random_engine e (seed);

    uniform_int_distribution<int> u(0, 2);
    
    int npc_choices[] = {paper, scissors, rock};
    
    int choiceA = npc_choices[u(e)];
    int choiceB = npc_choices[u(e)];
    const string nameA = "Ala", nameB = "Bel";
    cout << nameA << " chooses ";

    switch (choiceA) {
    case paper:
        cout << "paper";
        break;
    case rock:
        cout << "rock";
        break;
    case scissors:
        cout << "scissors";
        break;
    }
    cout << endl;
    cout << nameB << " chooses ";
    switch (choiceB) {
    case paper:
        cout << "paper";
        break;
    case rock:
        cout << "rock";
        break;
    case scissors:
        cout << "scissors";
        break;
    }
    cout << endl;
    cout << "\n";
    
    switch (choiceA) {
    case paper:
        switch (choiceB) {
        case rock:
            cout << nameA << explanationPR << endl;
            break;
        case scissors:
            cout << nameB << explanationSP << endl;
            break;
          case paper: {
            cout << "Tie";
            break;
          }
        }
        break;
    case rock:
        switch (choiceB) {
        case paper:
            cout << nameB << explanationSP << endl;
            break;
        case scissors:
            cout << nameA << explanationRS << endl;
            break;
          case rock: {
            cout << "Tie";
            break;
        }
        }
        break;
      case scissors:
        switch (choiceB) {
          case paper:
            cout << nameA << explanationSP << endl;
            break;
          case rock:
            cout << nameB << explanationRS << endl;
            break;
          case scissors: {
            cout << "Tie";
            break;
        }
        }
        break;
    default:
        cout << "something is wrong";
        cout << endl;
        break;
    }
    
    return 0;
}