logb : logb « math.h « C Tutorial






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  3. logb
ItemValue
Header filemath.h
Declarationfloat logbf(float num);
double logb(double num);
long double logbl(long double num);
Returnreturns the exponent of num as a floating-point integer value.


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

  int main(void)
  {
    double val = 1.0;

    do {
      printf("%f %f\n", val, logb(val));
      val++;
    } while (val<11.0);

    return 0;
  }

1.000000 0.000000
2.000000 1.000000
3.000000 1.000000
4.000000 2.000000
5.000000 2.000000
6.000000 2.000000
7.000000 2.000000
8.000000 3.000000
9.000000 3.000000
10.000000 3.000000








19.48.logb
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