C/math.h/log1p

log1p: returns the natural logarithm for num+1

<source lang="cpp">

//Declaration: float log1pf(float num);

              double log1p(double num); 
              long double log1pl(long double num);  

   
 
 #include <math.h>
 #include <stdio.h>
 int main(void)
 {
   double val = 1.0;
   do {
     printf("%f %f\n", val, log1p (val));
     val++;
   } while (val<11.0);
   return 0;
 }
        
       /*

1.000000 0.693147 2.000000 1.098612 3.000000 1.386294 4.000000 1.609438 5.000000 1.791759 6.000000 1.945910 7.000000 2.079442 8.000000 2.197225 9.000000 2.302585 10.000000 2.397895

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      </source>