I don’t understand why the GeeksForGeeks solution to this exact problem doesn’t work, would love if someone could explain it.
int reversDigits( int num)
{
// Handling negative numbers
bool negativeFlag = false ;
if (num < 0)
{
negativeFlag = true ;
num = -num ;
}
int prev_rev_num = 0, rev_num = 0;
while (num != 0)
{
int curr_digit = num%10;
rev_num = (rev_num*10) + curr_digit;
// checking if the reverse overflowed or not.
// The values of (rev_num - curr_digit)/10 and
// prev_rev_num must be same if there was no
// problem.
if ((rev_num - curr_digit)/10 != prev_rev_num)
{
printf ( "WARNING OVERFLOWED!!!\n" );
return 0;
}
prev_rev_num = rev_num;
num = num/10;
}
return (negativeFlag == true )? -rev_num : rev_num;
}