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is double an integer
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| #include <inttypes.h> | |
| int isInteger(double input) { | |
| uint64_t x = *((uint64_t*)&input); | |
| if ((x & 0x7fffffffffffffffULL) == 0) | |
| return 1; | |
| int i; | |
| for (i = 52; i >= 0 && !(x & (1ULL << (52-i))); i--); | |
| return (int)(((x & 0x7ff0000000000000ULL) >> 52) - 1023) >= i; | |
| } | |
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