Question

How to use log10() function to calculate the common base-10 logarithm in C++

Answer 1

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	cout << "log10(1) = " << log10(1) << endl;
	cout << "log10(5) = " << log10(5) << endl;
	cout << "log10(100) = " << log10(100) << endl;
	cout << "log10(125) = " << log10(125) << endl;
	cout << "log10(125) / log10(5) = " << log10(125) / log10(5) << endl;
	cout << "log10(3.5) = " << log10(3.5) << endl;
	cout << "log10(1000) = " << log10(1000) << endl;
	cout << "log10(0.001) = " << log10(0.001) << endl;

	return 0;
}

/*
run:

log10(1) = 0
log10(5) = 0.69897
log10(100) = 2
log10(125) = 2.09691
log10(125) / log10(5) = 3
log10(3.5) = 0.544068
log10(1000) = 3
log10(0.001) = -3

*/

 

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