"--" operation examples are as follows:
int i = 1; int j1 = i--; // 先将i的原始值（1）赋值给变量j1（1），然后i变量的值减1 int j1 = --i; // 先将i变量的值减1，然后将i的当前值（0）赋值给变量j1（0）
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