The function double log10(double x); returns the common logarithm of x. The common logarithm is the base-10 logarithm.
Function prototype of log10
double log10(double x);
- x : A floating point value whose logarithm to be calculated. It must be positive.
Return value of log10
It returns the common logarithm of x. If x is negative, a domain error occurs.
C program using log10 function
The following program shows the use of log10 function.
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#include <stdio.h>
#include <math.h>
int main ()
{
double x, result;
/* Logarithm is only defined for positive numbers */
printf("Enter a positive number\n");
scanf("%lf", &x);
result = log10(x);
printf("Logarithm of %lf with base 10 is : %lf", x, result);
return 0;
}
Output
Enter a positive number 123 Logarithm of 123.000000 with base 10 is : 2.089905
Enter a positive number 100 Logarithm of 100.000000 with base 10 is : 2.000000