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5 files changed, 124 insertions, 0 deletions

diff --git a/4p10.cpp b/4p10.cpp
new file mode 100644
index 0000000..5e18c6b
--- /dev/null
+++ b/4p10.cpp
@@ -0,0 +1,21 @@
+#include <iostream>
+
+/*
+ *
+ * 4.10
+ *
+ *
+ */
+
+int main () {
+
+	int val;
+	while(std::cin >> val && val != 42) {
+	}
+
+	if(val == 42) {
+		std::cout << "We found 42!" << std::endl;
+	}
+	
+	return 0;
+}
diff --git a/4p11.cpp b/4p11.cpp
new file mode 100644
index 0000000..308ef2c
--- /dev/null
+++ b/4p11.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+
+/*
+ *
+ * 4.11
+ *
+ *
+ */
+
+int main () {
+
+	int a = 0;
+	int b = 0;
+	int c = 0;
+	int d = 0;
+	if(std::cin >> a >> b >> c >> d) {} else { return -1; }
+	
+	if(a > b && b > c && c > d) {
+		std::cout << "True!" << std::endl;
+	} else {
+		std::cout << "False!" << std::endl;
+	}
+	
+	return 0;
+}
diff --git a/4p12.cpp b/4p12.cpp
new file mode 100644
index 0000000..74442e4
--- /dev/null
+++ b/4p12.cpp
@@ -0,0 +1,23 @@
+#include <iostream>
+
+/*
+ *
+ * 4.12
+ *
+ *
+ */
+
+int main () {
+
+	int i = 1;
+	int j = 9;
+	int k = 10;
+
+	if(i != (j < k)) { // j < k is evaluated first
+		// because j < k now it will return true
+		// When 'i' is NOT true(aka NOT 0) then print below
+		std::cout << "..." << std::endl;
+	}
+	
+	return 0;
+}
diff --git a/4p8.cpp b/4p8.cpp
new file mode 100644
index 0000000..46c402a
--- /dev/null
+++ b/4p8.cpp
@@ -0,0 +1,17 @@
+#include <iostream>
+
+/*
+ *
+ * 4.8
+ *
+ *
+ */
+
+int main () {
+
+	// AND, OR
+	// AND's right operand is only evaluated if the left operand is True
+	// OR's right operand is only evaluated if the left operand is False
+	// Equality evaluates left and right and then checks if they are equal
+	return 0;
+}
diff --git a/4p9.cpp b/4p9.cpp
new file mode 100644
index 0000000..101f1c9
--- /dev/null
+++ b/4p9.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+
+/*
+ *
+ * 4.9
+ *
+ *
+ */
+
+int main () {
+	// True if:
+	// the address pointed to isnt null
+	// the first character isnt a null character
+
+	// We can test this by making a string literal, for exmple "Hello world"
+	// We can also test by putting the null character \0 in the string literal
+	// And we can also test by pointing cp at nullptr
+	int choice;
+	const char *hw = "Hello world!";
+	const char *np = nullptr;
+	const char nc = '\0';
+	const char *cp;
+	std::cout << "1: Hello World | 2: nullptr | 3: null character" << std::endl;
+	if(std::cin >> choice) {} else { return -1; }
+	
+	if(choice == 1) { cp = hw; }
+	else if(choice == 2) { cp = np; }
+	else if(choice == 3) { cp = &nc; }
+	else { return -1; }
+	
+	if (cp && *cp) {
+		std::cout << "valid" << std::endl;
+	} else {
+		std::cout << "not valid" << std::endl;
+	}
+
+	return 0;
+}