Find the errors in following program.

//This program uses a switch statement to assign a

// letter grade (A, B, C, D, or F) to numeric test score.

#include

uisng namespace std;

int main()

{

int testScore;

cout<<"Enter your test score and I will tell you ";

cout<<"the letter grade you earned: ";

cin>>testScore;

switch (testScore)

{

case (testScore < 60)

cout<<"Your grade is F. ";

break;

case (testScore <70)

cout<<"Your grade is D. "

break;

case (testScore <80)

cout<<"Your grade is C. ";

break;

case (testScore < 90)

cout<<"Your grade is B. ";

break;

case (testScore <= 100)

cout<<"Yourgrade is A. ";

break;

default:

cout<<"That score isn't valid ";

return 0;

}