Search:

remember that all class names should be capitalized!
change the class name to Marc1

for the last method, the method signature clearly indicates that you intend for the method to return a String. ...

also IOException is not thrown in the body of main, you can remove the 'throws IOException' clause

here are some modifications that should result in a program that gives the correct output.

this line:
private char[] letterGrade={'A','B','C','D','E','F'};
already initializes and loads up the...