Question

How to get the fraction and exponent of a real number in C

Answer 1

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

int main() {
    double d = 3.14;
    int exponent;
    
    // Mantissa is the fractional part of a number = 0.785000
    
    // double frexp(double x, int *exponent);
    double fraction = frexp(d, &exponent);
    printf("fraction = %f exponent = %d\n", fraction, exponent);

    return 0;
}


/*
run:

fraction = 0.785000 exponent = 2

*/

 

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