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void draw_hex(double x_center, double y_center, double R, CDC* pDC) {
	static const double PI = 3.14159;
 
	double C = R * cos(PI / 6);
	double S = R * sin(PI / 6);
 
	pDC->MoveTo(x_center, y_center - R);
	pDC->LineTo(x_center + C, y_center - S);
	pDC->LineTo(x_center + C, y_center + S);
	pDC->LineTo(x_center, y_center + R);
	pDC->LineTo(x_center - C, y_center + S);
	pDC->LineTo(x_center - C, y_center - S);
	pDC->LineTo(x_center, y_center - R);
}
 
/* ... */
 
	static double PI = 3.1416;
 
	static double R = 50;
	static const int left = 50;
	static const int top = 50;
	double x = 100.0;
	double y = 100.0;
 
	for (int i = 0; i < 5; i++) {
		for (int j = 0; j < 5; j++) {
			double offset = R * cos(PI / 6);
			double x = left + i * 2 * offset + (j&1)*offset;
			double y = top + j * R * 3 / 2;
			draw_hex(x, y, R, pDC);
		}
	}
 

prog.cpp:1:59: error: ‘CDC’ has not been declared
 void draw_hex(double x_center, double y_center, double R, CDC* pDC) {
                                                           ^
prog.cpp: In function ‘void draw_hex(double, double, double, int*)’:
prog.cpp:4:27: error: ‘cos’ was not declared in this scope
  double C = R * cos(PI / 6);
                           ^
prog.cpp:5:27: error: ‘sin’ was not declared in this scope
  double S = R * sin(PI / 6);
                           ^
prog.cpp:7:7: error: request for member ‘MoveTo’ in ‘* pDC’, which is of non-class type ‘int’
  pDC->MoveTo(x_center, y_center - R);
       ^
prog.cpp:8:7: error: request for member ‘LineTo’ in ‘* pDC’, which is of non-class type ‘int’
  pDC->LineTo(x_center + C, y_center - S);
       ^
prog.cpp:9:7: error: request for member ‘LineTo’ in ‘* pDC’, which is of non-class type ‘int’
  pDC->LineTo(x_center + C, y_center + S);
       ^
prog.cpp:10:7: error: request for member ‘LineTo’ in ‘* pDC’, which is of non-class type ‘int’
  pDC->LineTo(x_center, y_center + R);
       ^
prog.cpp:11:7: error: request for member ‘LineTo’ in ‘* pDC’, which is of non-class type ‘int’
  pDC->LineTo(x_center - C, y_center + S);
       ^
prog.cpp:12:7: error: request for member ‘LineTo’ in ‘* pDC’, which is of non-class type ‘int’
  pDC->LineTo(x_center - C, y_center - S);
       ^
prog.cpp:13:7: error: request for member ‘LineTo’ in ‘* pDC’, which is of non-class type ‘int’
  pDC->LineTo(x_center, y_center - R);
       ^
prog.cpp: At global scope:
prog.cpp:26:2: error: expected unqualified-id before ‘for’
  for (int i = 0; i < 5; i++) {
  ^
prog.cpp:26:18: error: ‘i’ does not name a type
  for (int i = 0; i < 5; i++) {
                  ^
prog.cpp:26:25: error: ‘i’ does not name a type
  for (int i = 0; i < 5; i++) {
                         ^
prog.cpp:18:16: warning: ‘PI’ defined but not used [-Wunused-variable]
  static double PI = 3.1416;
                ^
prog.cpp:20:16: warning: ‘R’ defined but not used [-Wunused-variable]
  static double R = 50;
                ^

Standard output is empty