Condition in while loop

#1

Why we are writing while(dividend/divisor!=0) ?instead of this can we write while(remainder!=0)?? But im getting error in that case!

#2

while (divident % divisor != 0) {

		int rem = divident % divisor;
		divident = divisor;
		divisor = rem;
	}

if here you’ve replaced the while condition, then the remainder variable is not defined for that condition.We have defined it inside the loop.