The methods of swapping two numeric values can be divided into two categories: either by using the variable block directly (Figure 8b), or by defining a new block by setting My block (Figure bc-d), which is convenient for repeated calls. It is worth noting that these two methods are not the same. When using the variable block directly, if [set a to b] or [set b to a] directly, the values of both a and b will change immediately and the value cannot be swapped (Figure 8a). Therefore, the third variable [set temp to A] must be added as the intermediate variable to store the value (Figure 8b). In My block, however, both methods can swap values (Figure 8c-d).