Question

How to calculate log10 (base-10 logarithm) in C

Answer 1

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

//  double log10(double x);
 
int main(int argc, char **argv) 
{
    printf("%.2f\n",  log10(123));
    printf("%d\n",  (int)log10(123));
    printf("%.2f\n",  log10(1234));
    printf("%d\n",  (int)log10(1234));
    printf("%.2f\n",  log10(12345));
    printf("%d\n",  (int)log10(12345));

    return(0);
}
 
 
/*
run:
 
2.09
2
3.09
3
4.09
4
 
*/

 

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