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January 4, 2023 12:51
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Calculate log2(1<<49 - 1) in a higher precision than double.
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <gmp.h> | |
#include <mpfr.h> | |
int main (void) | |
{ | |
mpfr_t x, y; | |
mpfr_init2(x, 20); | |
mpfr_init2(y, 20); | |
mpfr_set_ui(x, 1UL<<49-1, MPFR_RNDD); | |
mpfr_log2(y, x, MPFR_RNDD); | |
mpfr_printf("x=%.0Rf, y=%.20Rf\n", x, y); | |
mpfr_clear(x); | |
mpfr_clear(y); | |
mpfr_free_cache(); | |
return 0; | |
} |
Author
hnakamur
commented
Jan 4, 2023
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