Question

Im trying to convert radians to degrees, but im not getting the same results as google

calculator and the Pi i defined dosent output all number.

If you type in google search: (1 * 180) / 3.14159265 then you get 57.2957796, but my program is

outputting: 57.2958 and if you type in google search Pi you get: 3.14159265, but mine

dosent output the rest, it output: 3.14159

My code is:

#include <iostream>
#define SHOW(X) cout << # X " = " << (X) << endl

using namespace std;

double Pi_test = 3.14159265;

float radian_to_degree(double  ENTER) {
  double Pi = 3.14159265;
  float degrees = (ENTER * 180) / Pi;
  return degrees;
}

int main (int argc, char * const argv[]) {
    SHOW( radian_to_degree(1) ); // 57.2958 not 57.2957795 like google, why?
    SHOW( Pi_test ); // output 3.14159' not 3.14159265, why? 
    return 0;
}

Please help me fix this, what wrong? any example?

Answer 1

As stated here, it may be that cout in C++ is rounding your number before displaying it. Try this:

#define SHOW(X) cout << setprecision(some_number) << # X " = " << (X) << endl