bash-busybox, 71 bytes

Result

AC

Duration

3202ms

Code [DL]

read h
read w
f(){
printf \\$[++i%w/2*c?40:i>w?c=h--%h,i=0,12:52];f
}
f

stdin

79
34

stdout

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**********************************

stderr

/code.bash: line 4: ++i%w/2*c?40:i>w?c=h--%h,i=0,12:52: division by 0 (error token is "h,i=0,12:52")