C Tutorial/math.h/ilogb

ilogb

Item Value Header file math.h Declaration int ilogbf(float num);int ilogb(double num);int ilogbl(long double num); Return returns the exponent of num.

<source lang="cpp">#include <math.h>

 #include <stdio.h>
 int main(void)
 {
    int e;
    e = ilogbl(4);

    printf("%d", e);

 }</source>