make, 141 bytes

Result

AC

Duration

1014ms

Code [DL]

a:
	@echo 'c;i;main(w,h){for(scanf("%d%d",&h,&w);!i++?i=~w,h--:putchar(!i?c=10:i%w/2*h*c?32:42););}'|gcc -xc -;echo $(strip $(STDIN))|./a.out

stdin

78
11

stdout

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***********

stderr

<stdin>:1:1: warning: data definition has no type or storage class
<stdin>:1:1: warning: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
<stdin>:1:3: warning: data definition has no type or storage class
<stdin>:1:3: warning: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
<stdin>:1:5: warning: return type defaults to 'int' [-Wimplicit-int]
<stdin>: In function 'main':
<stdin>:1:5: warning: type of 'w' defaults to 'int' [-Wimplicit-int]
<stdin>:1:5: warning: type of 'h' defaults to 'int' [-Wimplicit-int]
<stdin>:1:19: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
<stdin>:1:19: warning: incompatible implicit declaration of built-in function 'scanf'
<stdin>:1:19: note: include '<stdio.h>' or provide a declaration of 'scanf'
<stdin>:1:53: warning: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]