Reverse Integer 2015年6月23日

Reverse digits of an integer.Example1: x = , return
Example2: x = -, return -

/ test cases passed.
Status: Accepted
Runtime: ms
Submitted: minutes ago

public class Solution {
StringBuilder result = new StringBuilder("");
public int reverse(int x) {
//Integer.MIN_VALUE 会引起各种麻烦
if(x == Integer.MIN_VALUE){
return 0;
}
if(x >= 0){
if ( x == 0)
return 0;
else
{
result.append(x%10);
reverse(x/10);
} }else{
if ( x == 0)
return 0;
else
{
result.append(Math.abs(x)%10);
reverse(x/10);
}
} if( Long.parseLong(result.toString())-Integer.MAX_VALUE>0){
return 0;
}else{
if(x<0){
return 0-Integer.parseInt(result.toString());
}else{
return Integer.parseInt(result.toString());
}
} }
}

/ test cases passed.
Status: Accepted
Runtime: ms
Submitted: minutes ago

class Solution {
public:
int reverse(int x) {
long result = ;
while(x != )
{
result = result* + x % ;
x /= ;
}
return (result > INT_MAX || result < INT_MIN)? : result;
}
};

public class Solution {
public int reverse(int x) {
long result = 0;
while(x != 0)
{
result = result*10 + x % 10;
x /= 10;
}
return (int) ((result > Integer.MAX_VALUE || result < Integer.MIN_VALUE)? 0 : result);
}}

/ test cases passed.
Status: Accepted
Runtime: ms
Submitted: minutes ago

Reverse Integer :
以整形数字12345为例:第1次循环：
x=
result = 第2次循环：
x=
result = *+ = 第3次循环：
x=
result = （*+）*+ = 第4次循环：
x=
result = （（*+）*+）* + = 第5次循环：
x=
result = （（（*+）*+）* + ）* + =