phanSo

#include <stdio.h>
#include <math.h>
struct phanSo
{
	int tu;
	int mau;
}p1, p2, p;
void nhap (phanSo &p1, phanSo &p2);
void xuat (phanSo &p);
int USCLN (phanSo p);
int rutGon (phanSo &p);
int xuLy (phanSo &p);
void tinhTong (phanSo p1, phanSo p2, phanSo &p);
void tinhHieu (phanSo p1, phanSo p2, phanSo &p);
void tinhTich (phanSo p1, phanSo p2, phanSo &p);
int tinhThuong (phanSo p1, phanSo p2, phanSo &p);
void nhap2 (phanSo &p);
void kiemTraTinhToiGian (phanSo &p);
void kiemTraAmDuong (phanSo &p);
void soSanh (phanSo &p1, phanSo &p2);
void quyDong (phanSo &p1, phanSo &p2);
void main ()
{
	printf ("Hay chon so tuong ung voi yeu cau :\n1-Kiem tra tinh toi gian.\n2-Rut gon.\n3-Tinh tong.\n4-Tinh hieu.\n5-Tinh tich.\n6-Tinh thuong.\n7-So sanh.\n8-Kiem tra am duong.\n");
	int lenh;
	do
	{
		scanf ("%d",&lenh);
		if (lenh<1||lenh>8)
		{
			printf ("Nhap lhong hop le , hay nhap lai !\n");
		}
	} while (lenh<1||lenh>8);
	if (lenh==1)
	{
		nhap2(p);
		kiemTraTinhToiGian (p);
	}
	if (lenh==2)
	{
		nhap2(p);
		xuat (p);
	}
	if (lenh==3)
	{
		nhap (p1,p2);
		tinhTong (p1,p2,p);
		xuat (p);
	}
	if (lenh==4)
	{
		nhap (p1,p2);
		tinhHieu (p1,p2,p);
		xuat (p);
	}
	if (lenh==5)
	{
		nhap (p1,p2);
		tinhTich (p1,p2,p);
		xuat (p);
	}
	if (lenh==6)
	{
		nhap (p1,p2);
		int kt=tinhThuong (p1,p2,p);
		if (kt==0)
		{
			printf ("Khong chia duoc !\n");
		} else
		{
			xuat (p);
		}
	}
	if (lenh==7)
	{
		nhap(p1,p2);
		soSanh (p1,p2);
	}
	if (lenh==8)
	{
		nhap2(p);
		kiemTraAmDuong(p);
	}

}
void soSanh (phanSo &p1, phanSo &p2)
{
	quyDong (p1,p2);
	if (p1.tu>p2.tu)
	{
		printf ("phan so thu nhat lon hon\n");
	} else
	{
		if (p1.tu==p2.tu)
		{
			printf ("Hai phan so bang nhau\n");
		} else
		{
			printf ("Phan so thu hai lon hon\n");
		}
	}
}
void quyDong (phanSo &p1, phanSo &p2)
{
	p1.tu=p1.tu*p2.mau;
	p2.tu=p2.tu*p1.mau;
}
void kiemTraAmDuong (phanSo &p)
{
	if ((p.tu<0&&p.mau>0)||(p.tu>0&&p.mau<0))
	{
		printf ("Am !\n");
	} else
	{
		if (p.tu==0)
		{
			printf ("Khong am khong duong !\n");
		} else
		{
			printf ("Duong !\n");
		}
	}
}
void nhap2 (phanSo &p)
{
	printf ("Nhap lan luot tu va mau cua phan so :\n");
	do
	{
		scanf ("%d%d",&p.tu, &p.mau);
		if (p.mau==0)
		{
			printf ("Phan so khong hop le hay nhap lai !\n");
		}
	} while (p.mau==0);
}
void kiemTraTinhToiGian (phanSo &p)
{
	xuLy (p);
	if ((p.tu==0)||((p.tu==1)&&(p.mau==1)))
	{
		printf ("toi gian\n");
	} else
	{
		int kt=USCLN (p);
		if (kt==1)
		{
			printf ("toi gian \n");
		} else
		{
			printf ("khong toi gian \n");
		}
	}
}
int tinhThuong (phanSo p1, phanSo p2, phanSo &p)
{
	if (p2.tu==0)
	{
		return 0;
	} else
	{
		p.mau=p1.mau*p2.tu;
		p.tu=p1.tu*p2.mau;
	}
	return 1;
}
void tinhTich (phanSo p1, phanSo p2, phanSo &p)
{
	p.mau=p1.mau*p2.mau;
	p.tu=p1.tu*p2.tu;
}
void tinhHieu (phanSo p1, phanSo p2, phanSo &p)
{
	p.mau=p1.mau*p2.mau;
	p.tu=p1.tu*p2.mau-p2.tu*p1.mau;
}
void tinhTong (phanSo p1, phanSo p2, phanSo &p)
{
	p.mau=p1.mau*p2.mau;
	p.tu=p1.tu*p2.mau+p2.tu*p1.mau;
}
int xuLy (phanSo &p)
{
	if (p.tu==0)
	{
		return -2;
	}
	if ((p.tu<0)&&(p.mau<0))
	{
		p.tu=abs (p.tu);
		p.mau=abs (p.mau);
		return 0;
	} else
	{
		if (p.tu<0)
		{
			p.tu=abs(p.tu);
			return 1;
		} else
		{
			if (p.mau<0)
			{
				p.mau=abs (p.mau);
				return 1;
			}
		}
	}
	return 0;
}
int USCLN (phanSo p)
{
	int a=p.tu;
	int b=p.mau;
	if (a==b)
	{
		return 0;
	} else
	{
		while (a!=b)
		{
			if (a>b)
			{
				a=a-b;
			} else
			{
				b=b-a;
			}
		}
	}
	return a;
}
int rutGon (phanSo &p)
{
	int kt=xuLy (p);
	if (kt==-2)
	{
		return -2;
	}
	int a=USCLN (p);
	if (a==0)
	{
		if (kt==1)
		{
			return -1;
		} else
		{
			return 0;
		}
	} else
	{
		if (kt==0)
		{
			p.tu=p.tu/a;
			p.mau=p.mau/a;
		} else
		{
			p.tu=-p.tu/a;
			p.mau=p.mau/a;
		}
	}
	return 1;
}
void nhap (phanSo &p1, phanSo &p2)
{
	printf ("Nhap lan luot tu va mau cua 2 phan so :\n");
	do
		{
			scanf ("%d%d%d%d",&p1.tu,&p1.mau,&p2.tu,&p2.mau);
			if (p1.mau==0||p2.mau==0)
			{
				printf ("Phan so khong hop le hay nhap lai !\n ");
			}
		} while (p1.mau==0||p2.mau==0);
}
void xuat (phanSo &p)
{
	int kt=rutGon(p);
	if (kt==-2)
	{
		printf ("0");
	} else
	{
		if (kt==0)
		{
			printf ("1 ");
		} else
		{
			if (kt==-1)
			{
				printf ("-1");
			} else
			{
				if (p.mau==1)
				{
					printf ("%d ",p.tu);
				} else
				{
					printf ("%d/%d ",p.tu,p.mau);
				}
			}
		}
	}
}