Reverse digits of an integer.

classSolution { Public:    intReverseintx) {Longans=0;//long is afraid of the middle process overflowintmin=1<< to, max=-min-1;//Judging overflow,<< for left shift operation while(x!=0) {ans=ans*Ten+x%Ten; X=x/Ten; }        if(ans>max| | ans<min)return 0; returnans; }};

Comments:

This is the problem of the binary conversion.

Overflow must be considered during the conversion process.

Clear the range of representations for each type.

Report

32-bit platform:

unsigned int 0~4294967295
int-2147483648~2147483647 ( -2^31~ (2^31-1))//complement more than the original code to represent 1 numbers
unsigned long 0~4294967295
long-2147483648~2147483647
The maximum value of long long: 9223372036854775807
The minimum value of long long:-9223372036854775808
Unsigned the maximum value of long long: 1844674407370955161

Maximum value of __int64:9223372036854775807
Minimum value of __int64:9223372036854775808
Maximum value of unsigned __int64:18446744073709551615

Reverse digits of an integer.