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Returns: FP_INFINITE FP_NAN FP_NORMAL FP_SUBNORMAL FP_ZERO #include <stdio.h> #include <math.h> int main(void) { printf("fpclassify(-1.0) %d\n", fpclassify(-1.0)); printf("fpclassify(1.0) %d\n", fpclassify(1.0)); printf("fpclassify(1.0/0.0) %d\n", fpclassify(1.0/0.0)); return 0; }