#include <iostream>
#include <math.h>
#include <string>
 
using namespace std;
 
//Declare variables and constants.
float x, log_8_x;
 
int main()
{
 
//Prompt user to input number.
cout << "This program will calculate the log base 8 of a number. Input \      
number to calculate" << endl;
cin >> x;
 
//Calculate log_8_x.
log_8_x = log(x) / log(8);
 
//Print log_8_x.
cout << "The log base 8 of " << x << " is " << log_8_x << endl;
 
//End main.
return (0);
 
}

I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8bWF0aC5oPgojaW5jbHVkZSA8c3RyaW5nPgoKdXNpbmcgbmFtZXNwYWNlIHN0ZDsKCi8vRGVjbGFyZSB2YXJpYWJsZXMgYW5kIGNvbnN0YW50cy4KZmxvYXQgeCwgbG9nXzhfeDsKCmludCBtYWluKCkKewoKLy9Qcm9tcHQgdXNlciB0byBpbnB1dCBudW1iZXIuCmNvdXQgPDwgIlRoaXMgcHJvZ3JhbSB3aWxsIGNhbGN1bGF0ZSB0aGUgbG9nIGJhc2UgOCBvZiBhIG51bWJlci4gSW5wdXQgXCAgICAgIApudW1iZXIgdG8gY2FsY3VsYXRlIiA8PCBlbmRsOwpjaW4gPj4geDsKCi8vQ2FsY3VsYXRlIGxvZ184X3guCmxvZ184X3ggPSBsb2coeCkgLyBsb2coOCk7CgovL1ByaW50IGxvZ184X3guCmNvdXQgPDwgIlRoZSBsb2cgYmFzZSA4IG9mICIgPDwgeCA8PCAiIGlzICIgPDwgbG9nXzhfeCA8PCBlbmRsOwoKLy9FbmQgbWFpbi4KcmV0dXJuICgwKTsKCn0=