I keep gtting error and coode is not running: #include

#include

#include

$///$ @brief

$///$ @return

int main$()\{$

char $*$infilename $=$ "roster.txt$"$;

char $*$outfilename $=$ "gradeReport.txt$"$;

FILE $*$infile;

FILE $*$outfile;

int numStudents;

RECORD$\_$TYPE $**$gradeRoster;

$//$ Attempt to open the infile for reading

infile $=$ fopen$($infilename$,"$r$")$;

if $($infile $==$ NULL$)\{$

printf$("$Error opening file $\%$s for reading.

$",$ infilename$)$;

return $1$;

$\}$

$//$ Attempt to open the outfile for writing

outfile $=$ fopen$($outfilename$,"$w$")$;

if $($outfile $==$ NULL$)\{$

printf$("$Error opening file $\%$s for writing.

$",$ outfilename$)$;

return $1$;

$\}$

$//$ Read the number of students from the file

fscanf$($infile$,"\%$d$",$ &numStudents$)$;

$//$ Allocate memory for gradeRoster

gradeRoster $=($RECORD$\_$TYPE $**)$malloc$($numStudents $*$ sizeof$($RECORD$\_$TYPE $*))$;

if $($gradeRoster $==$ NULL$)\{$

printf$("$Memory allocation failed.

$")$;

return $1$;

$\}$

$//$ Call loadRoster function

loadRoster$($infile$,$ gradeRoster, numStudents$)$;

$//$ Declare and initialize choice variable

int choice;

do $\{$

$//$ Call menu function and collect choice

choice $=$ menu$()$;

$//$ Call processChoice function

processChoice$($infile$,$ outfile, choice, gradeRoster, numStudents$)$;

$\}$ while $($choice $!=4)$;

$//$ Close files

fclose$($infile$)$;

fclose$($outfile$)$;

return $0$;

$\}$

this is error i keep getting

c:$/$mingw$/$bin$/../$lib$/$gcc$/$mingw$32/6\mathrm{.}3\mathrm{.}0/../../../$libmingw$32.$a$($main$.$o$)$:$(.$text.startup$+0$xa$0)$: undefined reference to $`$WinMain@$16\text{'}$

collect$2.$exe: error: ld returned $1$ exit status

PS C:$\backslash$Users$\backslash$foste$\backslash$OneDrive$\backslash$Desktop$\backslash$COP$2220>$