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I think the key is how to get the every digits in the number. eg. how we get 5 in 756. We could use this way:
- Guo Xu January 24, 2013756%10 = 6 => 756-6 = 750 => 750%100=50 => and then we get 5 to use operator +
int k = 0;
int n = 0;
while(n<50){n+=10;k++}
At the end , k will be 5.
We could use the same method to get 7...