Composing a Reversed Number in C


As we know, it is easy to get digits from right to left via the / and % operators. For example, digits in the number 123 from right to left are 3, 2, and 1. A reversed number 321 is constructed with these three digits. Let’s check whether the reversed number is identical to the original one. If it is, the original number is a palindrome.
The implementation is shown in Listing 2-7.
Listing 2-7. C Code to Verfiy Palindrome Numbers (Version 2)
/* It returns 1 when number is palindrome, otherwise returns 0. */
int IsPalindrome_solution2(unsigned int number) {
    int reversed = 0;
    int copy = number;
    while(number != 0) {
        reversed = reversed * 10 + number % 10;
        number /= 10;
}
    return (reversed == copy) ? 1 : 0;
}
Source Code:
    001_PalindromeNumber.c
Test Cases:
  • Palindrome numbers with odd length
  • Palindrome numbers with even length
  • Non-palindrome numbers
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