You are calculating the result correctly, but you are not printing it right. Also you do not need a second loop:
for(;i<size*8;++i){ // print last bit and shift left. printf("%u ",num&maxPow ? 1 : 0); num = num<<1; }
If you’d like to show off, you could replace the conditional with two exclamation points:
printf("%u ", !!(num&maxPow));
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