Radio Buttons

#include "graphapp.h"

radiobutton tomato, barbeque;
radiobutton cash, credit;

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

  printf("Payment:\n");
  if (ischecked(cash))
    printf("  Cash\n");
  if (ischecked(credit))
    printf("  Credit\n");

  exitapp();
}

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

  w = newwindow("Pizza", rect(0,0,200,350), StandardWindow);
  r = rect(10,10,100,30);

  newlabel("Sauce:", r, AlignLeft);             r.y += 35;

  tomato   = newradiobutton("Tomato", r, NULL); r.y += 35;
  barbeque = newradiobutton("BBQ", r, NULL);    r.y += 35;
  check(tomato);

  newradiogroup();

  newlabel("Payment:", r, AlignLeft);           r.y += 35;

  cash     = newradiobutton("Cash", r, NULL);   r.y += 35;
  credit   = newradiobutton("Credit", r, NULL); r.y += 35;
  check(cash);

  newbutton("Order Pizza", r, place_order);

  show(w);
  mainloop();
}

• Source code: radiogrp.c