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- int DemChuSo(int n)
- {
- int chuso=1;
- while(n)
- {
- ++chuso;
- n/=10;
- }
- return chuso;
- }
- int TongCacChuSo(int n)
- {
- int tong=0;
- while(n)
- {
- tong+=n%10;
- n/=10;
- }
- return tong;
- }
- int ChuSoDauTien(int n)
- {
- if(n<0) n*=-1;
- while(n>9)
- n/=10
- return n;
- }
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