Trouble with switch statement

...okay, i'm trying to make this program which accepts name, testscore, and marital status..then outputs them along with the letter grade based on test score. I don't think I'm using the cases right in the switch statement for test score, can anyone help?

Code:

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#define CB cin.ignore(cin.rdbuf()->in_avail())
#include <iomanip.h>
#include <stdlib.h>
 main()

        {  int TestScore, Grade; char Name[20], MarStat;

            cout<<"\n Enter a Student's Name: "; cin.getline(Name,20);CB;
            cout<<" Enter Student's Test TestScore: "; cin>>TestScore; CB;
            cout<<" Enter Student's Marital Status: "; cin>>MarStat; CB;

            while(TestScore != -1)
            {
              switch(TestScore)
              {case "TestScore<=100": case"TestScore>=90":
                    Grade='A'        ;
                case "TestScore<90":  case "TestScore>=80":
                    Grade='B'        ;
                case "TestScore<80":  case "TestScore>=70":
                    Grade='C'        ;
                case "TestScore<70":  case "TestScore>=60":
                    Grade='D'        ;
                case "TestScore<60":  case "TestScore>=0)":
                    Grade='F'        ;
                default:
                    Grade="Invalid Grade";}

              switch(MarStat)
                { case 'M': case 'm':
                  MarStat=" Married ";
                  case 'S': case 's':
                  MarStat=" Single ";
                  case 'D': case 'd':
                  MarStat=" Divorced ";
                  case 'W': case 'w':
                  MarStat=" Widowed ";}
            }
              cout<<"\n The Name of the Student: "<<Name;
              cout<<"\n The Marital Status of the Student: "<<MarStat;
              cout<<"\n The Test Score of the student: "<<TestScore;
              cout<<"\n The Letter Grade of the student: "<<Grade;
      system("PAUSE");
      return 0;
}

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Thanks in advance..

Code:

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switch(integer expression)
{
        case label1 : statement
        case label2 : statement
        .....
        default : statement
}

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integer-expression must be an expression that reduces to an integer expression

each label must an integer constant expression. Most often labels are simple int or char constants or enumerations ie 1 or 'q'

this is a paraphrase from c++ primer plus

I would use if then for testscores

do you need breaks after those case statment?

Code:

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{case "TestScore<=100": case"TestScore>=90":
                    Grade='A'   
break;

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you guys were a great help- I have no compiler errors now. But a few bugs which I don't know how to get rid of when i run the program

Code:

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#define CB cin.ignore(cin.rdbuf()->in_avail())
#include <iomanip.h>
#include <stdlib.h>
 main()

        {  int TestScore, Grade; char Name[20], MarStat;

              while(TestScore != -1)
            {
            cout<<"\n Enter a Student's Name: "; cin.getline(Name,20); CB;
            cout<<" Enter Student's Test TestScore: "; cin>>TestScore; CB;
            cout<<" Enter Student's Marital Status: "; cin>>MarStat  ; CB;


              switch(TestScore)
              {case 1:"<=100 && >=90";
                    Grade=(char)'A'        ; break;
                case 2:"<90  && >=80";
                    Grade=(char)'B'        ; break;
                case 3:"<80  && >=70";
                    Grade=(char)'C'        ; break;
                case 4:"<70  && >=60";
                    Grade=(char)'D'        ; break;
                case 5:"<60  && >=0";
                    Grade=(char)'F'        ; break;
                default:
                    Grade=(char)"Invalid Grade";}

              switch(MarStat)
                { case 'M': case 'm':
                  MarStat=(char)" Married "; break;
                  case 'S': case 's':
                  MarStat=(char)" Single ";  break;
                  case 'D': case 'd':
                  MarStat=(char)" Divorced ";break;
                  case 'W': case 'w':
                  MarStat=(char)" Widowed "; break;}

              cout<<"\n The Name of the Student: "<<Name;
              cout<<"\n The Marital Status of the Student: "<<MarStat;
              cout<<"\n The Test Score of the student: "<<TestScore;
              cout<<"\n The Letter Grade of the student: "<<Grade;
            }
      system("PAUSE");
      return 0;
}

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..when I run the program..it outputs name and test score correctly, but the marital status and letter grade comes out weird. Can anyone help? It's buggin' the crap outta me..