C/Math/Log

Calculate logarithm base 10: how to use log10

<source lang="cpp">

1. include <stdio.h>
2. include <math.h>

int main () {

 double param, result;
 param = 100.0;
 result = log10 (param);
 printf ("log10(%lf) = %lf\n", param, result );
 return 0;

}

      </source>

Calculate natural log: how to use log

<source lang="cpp">

1. include <stdio.h>
2. include <math.h>

int main () {

 double p, result;
 float param = 6.5;
 
 
 result = log (param);
 
 printf ("ln(%lf) = %lf\n", param, result );
 
 return 0;

}

      </source>

How to use log

<source lang="cpp">

1. include <math.h>
2. 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;

}

      </source>

How to use log10

<source lang="cpp">

1. include <math.h>
2. 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;

}

      </source>