log10() : log of a number to the base 10

#include <stdio.h>
int main() {
printf("\nNumber = %.2f", log10(3.54)); // Number = 0.55
printf("\nNumber = %.2f", log10(-3.12)); // Number = nan
printf("\nNumber = %.2f", log10(10)); // Number = 1.00
printf("\nNumber = %.2f", log10(-1));// Number = nan
printf("\nNumber = %.2f", log10(0));// Number = -inf
return 0;
}
We will get log value of any number with base 10 by using log10() function.
log10(x) 
x = input number

Example

#include <stdio.h>
#include <math.h>
int main(void){
     double  x,ret;
     x=2.7;
     ret=log10(x);
     printf("log10(%.2f)=%.2f", x,ret);
     return 0;
}
The above code will give this output.
log10(2.70)= 0.43

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