[Add] completed projects

Project/3/main.cpp

@@ -0,0 +1,155 @@
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+typedef struct
+{
+    int tu, mau;
+} phan_so;
+
+void nhap(phan_so &x)
+{
+    cout << "Tu = ";
+    cin >> x.tu;
+    while (cin.fail())
+    {
+        cin.clear();
+        cin.ignore(999, '\n');
+        cout << "Nhap loi! Tu = ";
+        cin >> x.tu;
+    }
+    cout << "Mau = ";
+    cin >> x.mau;
+    while (cin.fail() || x.mau == 0)
+    {
+        cin.clear();
+        cin.ignore(999, '\n');
+        cout << "Nhap loi! Mau = ";
+        cin >> x.mau;
+    }
+}
+
+int gcd(int a, int b)
+{
+    a = abs(a);
+    b = abs(b);
+    if (a%b == 0)
+    {
+        return b;
+    }
+    else
+    {
+        if (b > a)
+        {
+            return gcd(b, a);
+        }
+        else
+        {
+            return gcd(b, a%b);
+        }
+    }
+}
+
+void toi_gian(phan_so &x)
+{
+    int t = gcd(x.tu, x.mau);
+    x.tu /= t;
+    x.mau /= t;
+    if (x.mau < 0)
+    {
+        x.tu *= -1;
+        x.mau *= -1;
+    }
+}
+
+void xuat(phan_so x)
+{
+    cout << x.tu;
+    if (x.mau != 1)
+    {
+        cout << "/" << x.mau;
+    }
+}
+
+phan_so cong(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.mau + a.mau*b.tu;
+    t.mau = a.mau*b.mau;
+    return t;
+}
+
+phan_so tru(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.mau - a.mau*b.tu;
+    t.mau = a.mau*b.mau;
+    return t;
+}
+
+phan_so nhan(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.tu;
+    t.mau = a.mau*b.mau;
+    return t;
+}
+
+phan_so chia(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.mau;
+    t.mau = a.mau*b.tu;
+    return t;
+}
+
+int main()
+{
+    phan_so a, b, tong, hieu, tich, thuong;
+    cout << "Nhap tu va mau cua phan so a:" << endl;
+    nhap(a);
+    toi_gian(a);
+
+    cout << "Nhap tu va mau cua phan so b:" << endl;
+    nhap(b);
+    toi_gian(b);
+
+    cout << endl << "a = ";
+    xuat(a);
+    cout << endl << "b = ";
+    xuat(b);
+    cout << endl;
+
+    tong = cong(a, b);
+    toi_gian(tong);
+    cout << "a + b = ";
+    xuat(tong);
+    cout << endl;
+
+    hieu = tru(a, b);
+    toi_gian(hieu);
+     cout << "a - b = ";
+    xuat(hieu);
+    cout << endl;
+
+    tich = nhan(a, b);
+    toi_gian(tich);
+    cout << "a*b = ";
+    xuat(tich);
+    cout << endl;
+
+    if (b.tu != 0)
+    {
+        thuong = chia(a, b);
+        toi_gian(thuong);
+        cout << "a/b = ";
+        xuat(thuong);
+        cout << endl;
+    }
+    else
+    {
+        cout << "Phan so b = 0 nen khong the thuc hien phep chia!" << endl;
+    }
+    return 0;
+}