log10()

Return the logarithm to base 10 of the argument.

Syntax

log10(argument)

Parameter

Parameter

Definition

argument

numeric value whose base 10 logarithm is to be determined

*Valid Values* 
argument > 0

Description

The log10() function returns the logarithm of argument with respect to base 10. The output range for the log10() function is – ∞ < log10() < ∞ .

Example

The following log10() function calls print a number of useful physical and mathematical constants:

function main() {
PI = 3.141593;
printf("log10(PI) = %7.4f\n",log10(PI));
printf("log10( e) = %7.4f\n",log10(exp(1)));
printf("log10( 2) = %7.4f\n",log10(2));
printf("log10( 3) = %7.4f\n",log10(3));
return;}

The example produces the following output:

log10(PI) = 0.4971
log10( e) = 0.4343
log10( 2) = 0.3010
log10( 3) = 0.4771


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