C/math.h/log

log: returns the natural logarithm for num

<source lang="cpp">

//Header file: #include <math.h> //Declaration: float logf(float num);

                  double log(double num); 
                  long double logl(long double num);  

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

1.000000 0.000000 2.000000 0.693147 3.000000 1.098612 4.000000 1.386294 5.000000 1.609438 6.000000 1.791759 7.000000 1.945910 8.000000 2.079442 9.000000 2.197225 10.000000 2.302585

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      </source>