Added yesterday's practice

1 files changed, 140 insertions, 0 deletions

diff --git a/Year 1/Programming introduction/Practice-18.10.21.cpp b/Year 1/Programming introduction/Practice-18.10.21.cpp
new file mode 100644
index 0000000..9caa4d2
--- /dev/null
+++ b/Year 1/Programming introduction/Practice-18.10.21.cpp
@@ -0,0 +1,140 @@
+#include <iostream>
+#include <cmath>
+
+#pragma GCC diagnostic ignored "-Wdiv-by-zero"
+
+using namespace std;
+
+void ex0() {
+	int a;
+	cin >> a;
+
+	// Please, don't do this, it's really ugly
+	if (a / 100 > 0)
+		cout << (a / 100) << " * 100" << (((a %= 100) > 0) ? " + " : "");
+	if (a / 50 > 0)
+		cout << (a / 50)  << " * 50"  << (((a %= 50) > 0) ? " + " : "");
+	if (a / 20 > 0)
+		cout << (a / 20)  << " * 20"  << (((a %= 20) > 0) ? " + " : "");
+	if (a / 10 > 0)
+		cout << (a / 10)  << " * 10"  << (((a %= 10) > 0) ? " + " : "");
+	if (a / 5 > 0)
+		cout << (a / 5)  << " * 5"    << (((a %= 5) > 0) ? " + " : "");
+	if (a / 2 > 0)
+		cout << (a / 2)  << " * 2"    << (((a %= 2) > 0) ? " + " : "");
+	if (a > 0)
+		cout << a << " * 1";
+}
+
+void ex1() {
+	int a;
+	cin >> a;
+
+	switch (a) {
+		case  1: cout << "January";   break;
+		case  2: cout << "February";  break;
+		case  3: cout << "March";     break;
+		case  4: cout << "April";     break;
+		case  5: cout << "May";       break;
+		case  6: cout << "June";      break;
+		case  7: cout << "July";      break;
+		case  8: cout << "August";    break;
+		case  9: cout << "September"; break;
+		case 10: cout << "October";   break;
+		case 11: cout << "November";  break;
+		case 12: cout << "December";  break;
+	}
+}
+
+void ex2() {
+	int a;
+	cin >> a;
+
+	if (a >= 160)      cout << 700;
+	else if (a >= 130) cout << 350;
+	else if (a >= 110) cout << 150;
+	else if (a >=  90) cout <<  50;
+	else if (a >=  70) cout <<  20;
+	else cout << 0;
+}
+
+void ex3() {
+	int a, b, c;
+	cin >> a >> b >> c;
+
+	if (a < b && a < c)
+		cout << a << " " << ((b < c) ? b : c) << " " << ((c > b) ? c : b);
+	else if (b < a && b < c)
+		cout << b << " " << ((a < c) ? a : c) << " " << ((c > a) ? c : a);
+	else
+		cout << c << " " << ((b < a) ? b : a) << " " << ((a > b) ? a : b);
+}
+
+void ex4() {
+	int x1, y1, x2, y2, x, y;
+	cin >> x1 >> y1 >> x2 >> y2 >> x >> y;
+
+	// Again, this is very ugly
+	cout << (( ((x > x1 && x < x2) || (x > x2 && x < x1)) && ((y > y1 && y < y2) || (y > y2 && y < y1)) ) ? "true" : "false");
+}
+
+void ex5() {
+	cout << "Will output 26, since = returns a reference and at the end it evaluates to c + c." << endl;
+
+	int c = 5;
+	int d = (c += 3) + (c += 5);
+	cout << d;
+}
+
+void ex6() {
+	cout << "Will output 0, = evaluates from the right to the left, so c becomes 0 and we have 0 + 0." << endl;
+
+	int c = 5;
+	if (c += c -= 5)
+		cout << (c *= 10);
+	else
+		cout << c;
+}
+
+void ex7() {
+	cout << "Will output nothing, since you cannot divide by 0" << endl;
+
+	int c = 5;
+	cout << ((c == 6) || (c / 0));
+}
+
+void ex8() {
+	cout << "Will output 0, since comparison is lazy and when it evaluates c == 6 as false, it just returns" << endl;
+
+	int c = 5;
+	cout << ((c == 6) && (c / 0));
+}
+
+void ex9() {
+	cout << "Will output 16 1, because = returns a reference, which is practically a number, that is more than 0 so it evaluates as true" << endl;
+
+	int c = 5;
+	double e = 0;
+	cout << ((c = 6) && (e = 1));
+	cout << c << " " << e;
+}
+
+void ex10() {
+	double a, b, c;
+	cin >> a >> b >> c;
+
+	// Unfinished
+	double d = b * b - 4 * a * c;
+	if (d < 0) {
+		cout << "No real root." << endl;
+	} else if (d == 0) {
+		cout << 0;
+	} else {
+		d = sqrt(d);
+		cout << (-b + d) / (2 * a) << " " << (-b - d) / 2;
+	}
+}
+
+int main() {
+	ex10();
+}