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例如当num=1234时，正确的提取结果应为g=4，s=3，b=2，q=1
int g = num % 10, s = (num / 10) % 10, b = (num / 100) % 10, q = num / 1000;
int g = num % 10, s = num % 100, b = (num / 100) % 10, q = num / 1000;
int g = num / 10 % 10, s = num % 10, b = num / 1000, q = num / 100;
int g = (num / 10) % 10, s = num % 10, b = num / 100 % 10, q = num % 1000;