#include<stdio.h>
#include<conio.h>
#include<math.h>
main()
{
float a,b,s;
int menu,n,i;
printf("-------------------");
printf("\nCASIO FX-570ES PLUS");
printf("\n-------------------");
printf("\n       MENU");
printf("\n-------------------");
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\n* Moi ban chon tinh nang: ");
scanf("%d",&menu);
switch(menu)
{
	case 1: printf("\n Ban muon cong bao nhieu so: ");
			scanf("%d",&n);
			i=1;
			while(i<=n)
			{
				printf("\n Nhap so thu %d: ",i);
				scanf("%f",&a);
				s=s+a;
				i++;
			}
			printf("\n Tong = %f",s);
			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, tu 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 roi !!!");
};
printf("\n\n\n @ Copyright by Nhat Cuong");
getch();
}