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- #include <stdio.h>
- #include <stdlib.h>
- unsigned long reverse(unsigned long n) {
- unsigned long r = 0;
- while (n > 0) {
- r += n % 10;
- r *= 10;
- n /= 10;
- }
- r /= 10;
- return r;
- }
- int main(int argc, char **argv) {
- if (argc != 2) {
- printf("Usage: %s number\n", argv[0]);
- return 1;
- }
- unsigned long n = strtoul(argv[1], NULL, 0);
- unsigned long r = reverse(n);
- printf("%lu reversed is %lu.\n", n, r);
- return 0;
- }
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