$//$ FIX THE FOLLOWING FUNCTION

string getLetterGrade$($double grade$)\{$

std::string letterGrade;

if$($grade$>=90)\{$

letterGrade $="$A$"$;

$\}$

if $($grade $>=80)\{$

letterGrade $="$B$"$;

$\}$

if $($grade $>=70)\{$

letterGrade $="$C$"$;

$\}$

if $($grade $>=60||(60-$grade$)>=2\mathrm{.}5)\{$

letterGrade $="$D$"$;

$\}$

else$\{$

letterGrade $="$F$"$;

$\}$

return letterGrade;

$\}$