Arithmetic new requirements of thinking

1, can be customized: input number n,for n is the number of custom;
2, the topic avoids repetition:
X, arithmetic and y are different from the previous.
Compare x, compare y, compare operation symbol, same jump, different continue.
3, the range of values, compare whether the random number is within the range, if exceeded, re-random.
Control whether there is a multiplication method: My arithmetic is switch (n), the remainder n=2,3 when there is a multiplication method, to determine whether N is 2 or 3. Enter a program to control the size of N to see if there is a multiplication method.
Add and subtract whether there is no negative number: Want to determine whether n is added and minus, and then use z=x-y and 0 to compare, if there is no negative, z<0 jump re-cycle. These need to be judged before the loop is negative.

Arithmetic new requirements of thinking