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例如当n=123时,需要拆分得到个位3、十位2、百位1
int a = n%10; int b = n/10%10; int c = n%100;
int a = n/10; int b = n%10; int c = n/100;
int a = n%10; int b = (n/10)%10; int c = n/100;
int a = n%100; int b = n/10%10; int c = n/100;