27 lines
560 B
C
27 lines
560 B
C
#include <stdlib.h>
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#include <stdbool.h>
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bool isPalindrome(int x) {
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// negatives and numbers ending in 0 (except 0 itself) are not palindromes
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if (x < 0 || (x % 10 == 0 && x != 0))
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return false;
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int reversedHalf = 0;
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while (x > reversedHalf) {
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reversedHalf = reversedHalf * 10 + x % 10;
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x /= 10;
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}
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// for even digits: x == reversedHalf
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// for odd digits: x == reversedHalf / 10
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return (x == reversedHalf) || (x == reversedHalf / 10);
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}
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int main(int argc, char *argv[])
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{
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return EXIT_SUCCESS;
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}
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