Radio Buttons

#include "graphapp.h"

radiobutton tomato, barbeque;

void place_order(button b)
{
  printf("Sauce:\n");
  if (ischecked(tomato))     printf("  Tomato\n");
  if (ischecked(barbeque))   printf("  Barbeque\n");
  exitapp();
}

void choose(radiobutton sauce)
{
  if (sauce == tomato)         printf("Tomato sauce chosen\n");
  else if (sauce == barbeque)  printf("BBQ sauce chosen\n");
}

void main(void)
{
  window w;
  rect r;

  w = newwindow("Pizza", rect(0,0,200,180), StandardWindow);
  r = rect(10,10,100,25);

  tomato   = newradiobutton("Tomato", r, choose); r.y += 30;
  barbeque = newradiobutton("BBQ", r, choose);    r.y += 30;
  check(tomato);

  newbutton("Order Pizza", r, place_order);
  show(w);
  mainloop();
}

• Source code: radio.c