Question

How to use isfinite() function to determine if a float has finite value in C

Answer 1

#include <stdio.h>
#include <math.h>
#include <float.h>

// Return 1 = finite, ​0​ = infinite

int main(void)
{
    printf("isfinite(NAN)      = %d\n", isfinite(NAN));
    printf("isfinite(INFINITY) = %d\n", isfinite(INFINITY));
    printf("isfinite(0.0)      = %d\n", isfinite(0.0));
    printf("isfinite(3.14)     = %d\n", isfinite(3.14));
    printf("isfinite(DBL_MIN)  = %d\n", isfinite(DBL_MIN));
    printf("isfinite(989.123)  = %d\n", isfinite(989.123));
    printf("isfinite(1.0)      = %d\n", isfinite(1.0));
    printf("isfinite(exp(700)) = %d\n", isfinite(exp(700)));
}




/*
run:

isfinite(NAN)      = 0
isfinite(INFINITY) = 0
isfinite(0.0)      = 1
isfinite(3.14)     = 1
isfinite(DBL_MIN)  = 1
isfinite(989.123)  = 1
isfinite(1.0)      = 1
isfinite(exp(700)) = 1

*/

 

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