(cache)[C] gcc 13.2.0

Ran/Viewed Log

Author

anonymous

2 minutes ago

Language

C

Compiler

gcc 13.2.0

Options

Warnings

C11(GNU)

no pedantic

Raw compiler options

-lm
-O3
-ffast-math

Author

anonymous

2 minutes ago

›

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#include <stdio.h>

#include <math.h>

#include <fenv.h>

int main(void) {

long long q;

if (scanf("%lld", &q) != 1) return 1;

double v = sqrt(q);

long double vl = sqrtl(q);

printf("%.40f %.20a\n", v, v);

printf("%.40Lf %.20La\n", vl, vl);

#if defined(FE_DOWNWARD)

puts("setting rounding mode to FE_DOWNWARD");

if (fesetround(FE_DOWNWARD)) return 1;

#elif defined(FE_TOWARDZERO)

puts("setting rounding mode to FE_TOWARDZERO");

if (fesetround(FE_TOWARDZERO)) return 1;

#else

#error appropriate rounding mode unavailable

#endif

double v2 = sqrt(q);

long double vl2 = sqrtl(q);

printf("%.40f %.20a\n", v2, v2);

printf("%.40Lf %.20La\n", vl2, vl2);

return 0;

}

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4503599761588224

$ gcc prog.c -Wall -Wextra -std=gnu11 -lm -O3 -ffast-math

67108865.0000000000000000000000000000000000000000 0x1.00000040000000000000p+26
67108864.9999999925494194030761718750000000000000 0x8.000001ffffffc0000000p+23
setting rounding mode to FE_DOWNWARD
67108864.9999999850988388061523437500000000000000 0x1.0000003ffffff0000000p+26
67108864.9999999925494194030761718750000000000000 0x8.000001ffffffc0000000p+23

Exit Code:

0