Added all exercises for week 4

2015_2016/code/week4_ex1.cpp

+#include<iostream>
+
+using namespace std;
+
+int main() {
+
+	int i, n;
+	int initialInput;
+
+	cout << "Please enter an integer to start at: ";
+	cin >> i;
+	// save i for later
+	initialInput = i;
+	cout << "Now an integer to end at: ";
+	cin >> n;
+
+	// while loop implementation
+	while (i <= n) {
+		// print out the current value of i
+		cout << i << endl;
+		
+		// increment i
+		i++;
+	}
+	
+
+	// reset i
+	i = initialInput;
+	// do-while implementation
+	do {
+		//print out current i
+		cout << i << endl;
+
+		//increment
+		i++;
+	} while (i <= n);
+
+	return 0;
+}

2015_2016/code/week4_ex2.cpp

+#include<iostream>
+
+using namespace std;
+
+int main() {
+
+	int i, n;
+
+	cout << "Please enter an integer to start at: ";
+	cin >> i;
+	cout << "Now an integer to end at: ";
+	cin >> n;
+
+	for (int j = i; j <= n; j++) {
+		// output current value
+		cout << j << endl;
+	}
+	
+
+	return 0;
+}

2015_2016/code/week4_ex3.cpp

+#include<iostream>
+
+using namespace std;
+
+int main() {
+
+	int numRows = 8;
+	
+	// for each row
+	for (int i = 1; i <= 8; i++) {
+		// for each column
+		for (int j = 1; j <= i; j++) {
+			//output 1 asterisk
+			cout << '*';
+		}
+
+		// end the line after all printed
+		cout << endl;
+	}
+
+	return 0;
+}