I have been learning c++ for long now but error messages always pops up when I ever I write a program on my compiler

Answer 1

Did you add headers and main? in this way

#include <iostream>
using namespace std;

int main() {
union numericUnion{

int intValue;

long longValue;

double doubleValue;

};

numericUnion myUnion;

myUnion.intValue = 3;

cout << myUnion.intValue << endl;

myUnion.doubleValue = 4.5;

cout << myUnion.doubleValue << endl;
cout << myUnion.intValue;
cout << endl;

return 0;
}

Answer 2

Have you made sure to place the return 0? , As well as (;) and (:), naming the first letters of the classes with capital letters.

Answer 3

yeah thanks please refer to my second question

Answer 4

1. union numericUnion

2. {

3. int intValue;

4. long longValue;

5. double doubleValue;

6. };

7. numericUnion myUnion;

8. myUnion.intValue = 3;

9. cout << myUnion.intValue << endl;

10. myUnion.doubleValue = 4.5;

11. cout << myUnion.doubleValue << endl;

12. cout << myUnion.intValue;

13. cout << endl;