#include<stdio.h>
#include<conio.h>
#include<math.h>
main()
{
float a,b;
int menu;
printf("\n MENU");
printf("\n1.  + ");
printf("\n2.  - ");
printf("\n3.  x ");
printf("\n4.  : ");
printf("\n5.  Can bac hai ");
printf("\n6.  Binh phuong ");
printf("\n7.  Lap phuong ");
printf("\n8.  sin ");
printf("\n9.  cos ");
printf("\n10. tan ");
printf("\n Hay chon tinh nang: ");
scanf("%d",&menu);
switch(menu)
{
	case 1: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n Nhap b: ");
			scanf("%f",&b);
			printf("\n a + b = %.2f",a+b);
			break;
	case 2: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n Nhap b: ");
			scanf("%f",&b);
			printf("\n a - b = %.2f",a-b);
			break;
	case 3: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n Nhap b: ");
			scanf("%f",&b);
			printf("\n a x b = %.2f",a*b);
			break;
	case 4: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n Nhap b: ");
			scanf("%f",&b);
			if(b==0)
				printf("\n Phep chia ko dung, mau so phai khac 0");
			else
			printf("\n a : b = %.2f",a/b);
			break;
	case 5: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n Can bac hai cua a = %f",sqrt(a));
			break;
	case 6: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n Binh phuong cua a = %.2f",pow(a,2));
			break;
	case 7: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n Lap phuong cua a = %.2f",pow(a,3));
			break;
	case 8: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n sin a = %.2f",sin(a*3.14/180));
			break;
	case 9: printf("\n Nhap a: ");
			scanf("%f",&a);
			printf("\n cos a = %.2f",cos(a*3.14/180));
			break;
	case 10: printf("\n Nhap a: ");
			scanf("%f",&a);
			if(a==90)
				printf("\n Khong ton tai gia tri cua tan");
			else
			printf("\n tan a = %.2f",tan(a*3.14/180));
			break;
	default: printf("\n* CANH BAO: Ban chon tinh nang chua dung !!!");
};
getch();
}