Problems with my first switch statement.

[freddyjones39]

I am new to C++, and using gcc for a compiler. This is my first switch statement I have written, but it will not compile, and I can't figure out why (I have stared at it for a while now). The errors messages say there are syntax errors on line 15, and 35, but I can't find them! Sorry about the obvious question.
Thanks for your help.

here is the code

 
#include <iostream>
using namespace std;
 
char intro(char ans);
//Requires: The user must input one of the following a char values:
//q,Q,m,M,i,I.
//Promises: Returns the input to main.
 
int main()
{
  char ans= intro(char ans);
  do
    {
      switch (ans)
        {
        case 'q':
        case 'Q':
          cout<<"Q"<<endl;
          break;
        case 'm':
        case 'M':
          cout<<"M"<<endl;
          break;
        case 'i':
        case 'I':
          cout<<"I"<<endl;
          break;
        default:cout<<"improper data"<<endl;
          //intro runs good data.
        }
    }while (ans!=="q"||ans!=="Q"||ans!=="m"||ans!=="M"||ans!=="i"||ans!=="I");
 
}
 
char intro(char ans)
{
  cout<<"What the program does, and select one of the 3 options (m,i,q)"<<endl;
  cin>> ans;
  return ans;
}
 
 

[oler1s]

The errors messages say there are syntax errors on line 15, and 35,

Here's a hint. It's very useful to tell us what those syntax errors are, as we don't have an inbuilt compiler in our heads...

I see a mistake in ans!=="q" (in the while loop) and the similarly written not-equal comparisons. For one, the not equal operator is !=, not !==. Next, there is a difference in using ' ' and " " (single quotes vs. double quotes). As a more knowledgeable C++ programmer, you will eventually understand the implications of using a "".

For now, understand this. Whenever you have a single character, it should be surrounded by '. Never by ".