#include
int main()
{
char ch;
float r;
fflush(stdin);
printf("Nhap vao t hoac c: ");
scanf("%c", &ch);
if (ch == 't')
{
fflush(stdin);
printf("Nhap vao ban kinh hinh tron: ");
scanf("%f", &r);
printf("Dien tich hinh tron ban kinh %f la %f", r, r*r*3.14);
}
else if (ch == 'c')
{
fflush(stdin);
printf("Nhap vao ban kinh hinh cau: ");
scanf("%f", &r);
printf("The tich hinh cau ban kinh %f la %f", r, 0.75*3.14*r*r*r);
}
else printf("Chuong trinh khong phuc vu lua chon nay!\n");
return 0;
}