bài 8:
#include "stdio.h"
#include "conio.h"
void main ()
{
congviec:
{
int a,b,max;
float c;
char key;
printf("\n\n\+++++++++++++MENU cong viec++++++++++++++++++");
printf("\n- Nhap a va b (phim N)");
printf("\n- So sanh a va b (phim S)");
printf("\n- Giai va bien luan phuong trinh ax+b=0 (phim G)");
printf("\n- Thoat (phim T)");
printf("\n++++++++++++++++++++++++++++++++++++++++++++++++");
printf("\n Moi Ban Chon : ");
key=getch();
switch (key)
{
case 'n':
{
printf("\n\nNhap a,b : ");
scanf("%d%d",&a,&b);
}
goto congviec;
//break;
case 's':
{
if(a>b) max=a;
else max=b;
printf("\n\nSo lon hon la :%d", max);
}
goto congviec;
//break;
case 'g':
{
if(a==0)
if(b==0)
printf("\n\nPhuong trinh co vo so nghiem");
else
printf("\n\nPhuong trinh vo nghiem");
else
{
c=(float)-b/a;
printf("\n\nPhuong trinh %dx+%d=0 co nghiem la x = %f",a,b,c);
}
}
goto congviec;
//break;
case 't': break;
default: printf("\n\nKhong hop le !!!"); goto congviec;
}
}
getch();
}