41 lines
642 B
C
41 lines
642 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#define USE_INT 1
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#ifdef USE_INT
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typedef int T;
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#define FT "%d"
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#define even(x) ((x) % 2 == 0)
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#elif USE_LONG
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typedef long T;
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#define FT "%ld"
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#define even(x) ((x) % 2 == 0)
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#elif USE_DOUBLE
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typedef double T;
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#define FT "%20g"
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#define even(x) (floor((x) / 2) == ((x) / 2))
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#endif
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long collatz(T j) {
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long c = 0;
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while (j != 1) {
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printf("%ld: " FT "\n", c, j);
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if (even(j)) {
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j = j / 2;
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} else {
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j = j * 3 + 1;
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}
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c++;
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}
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return c;
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}
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int main(void) {
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T i = 113383;
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long c = collatz(i);
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printf("%ld\n", c);
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return 0;
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}
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