Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
題目比較簡單,需注意一下幾點:
1.x爲負數
2.溢出
代碼如下:
class Solution {
public:
int reverse(int x) {
bool flag = false;
if(x<0){
flag = true;
x = -x;
}
int result = 0;
while(x!=0){
if (result > INT_MAX/10 || result < INT_MIN/10){
return 0;
}
result = result * 10 + x%10;
x = x/10;
}
if(flag){
result = -result;
}
return result;
}
};