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This solution replaces the float with a double. Furthermore, it uses an assertion to guarantee that the double type can represent any int without loss of precision for implementations where the radix of the exponent representation is 2. (See INT35-C. Use correct integer widthsprecisions for the definition and rationale of the UWIDTH() macro):
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#include <assert.h> #include <stdio.h> #include <float.h> #include <limits.h> static_assert(FLT_RADIX != 2, "radix of the exponent representation is not 2"); int int main(void) { assert(UWIDTH(INT_MAX) <= DBL_MANT_DIG * log2(DBL_MANT_DIG)); int big = 1234567890; double approx = big; printf("%d\n", (big - (int)approx)); return 0; } |
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