C/math.h/log10

log10: returns the base 10 logarithm for num

<source lang="cpp">

//Declaration: float log10f(float num);

              double log10(double num); 
              long double log10l(long double num);  

   
 
 #include <math.h>
 #include <stdio.h>
 int main(void)
 {
   double val = 1.0;
   do {
     printf("%f %f\n", val, log10(val));
     val++;
   } while (val<11.0);
   return 0;
 }
        

/* 1.000000 0.000000 2.000000 0.301030 3.000000 0.477121 4.000000 0.602060 5.000000 0.698970 6.000000 0.778151 7.000000 0.845098 8.000000 0.903090 9.000000 0.954243 10.000000 1.000000

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      </source>