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0007-reverse-integer.cpp

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class Solution {

public:

int reverse(int x) {

int sign = x >= 0 ? 1 : -1;

if (x < 0) x = -x;

int y = 0;

while (x != 0) {

y = y * 10 + x % 10;

x /= 10;

}

return sign * y;

}

};