from tkinter import*

def urob():
    try:
        a=int(vstup1.get())
        b=int(vstup2.get())
        while a!=0:
            if a>=b:
                a=a-b
            else:
                x=a
                a=b
                b=x
        vystup1.delete(0,END)
        vystup1.insert(0,str(b))


    except:
        vystup1.delete(0,END)
        vystup1.insert(0,"CHYBA")

def vymaz():
    vstup1.delete(0,END)
    vstup2.delete(0,END)
    vystup1.delete(0,END)
    

root=Tk()
root.title("06-program-2A")

text1=Label(root,text="GTV 27.10.2022")
text1.grid(row=0,column=0)

text2=Label(root,text="a = ")
text2.grid(row=1,column=0)

text3=Label(root,text="b = ")
text3.grid(row=2,column=0)


text5=Label(root,text="Výsledok = ")
text5.grid(row=4,column=0)

vstup1=Entry(root,width=10)
vstup1.grid(row=1,column=1)

vstup2=Entry(root,width=10)
vstup2.grid(row=2,column=1)



vystup1=Entry(root,width=20)
vystup1.grid(row=4,column=1)

tlac1=Button(root,text="Ukonči",width=10,command=root.destroy)
tlac1.grid(row=5,column=0)

tlac2=Button(root,text="NSD",width=10,command=urob)
tlac2.grid(row=6,column=0)

tlac3=Button(root,text="Vymaž",width=10,command=vymaz)
tlac3.grid(row=5,column=1)

root.mainloop()