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5 files changed, 121 insertions, 0 deletions

diff --git a/6p16.cpp b/6p16.cpp
new file mode 100644
index 0000000..f522098
--- /dev/null
+++ b/6p16.cpp
@@ -0,0 +1,19 @@
+#include <iostream>
+
+/*
+ *
+ * 6.16
+ *
+ *
+ */
+
+bool is_empty(const std::string &a) {
+
+	return a.empty();
+}
+
+int main () {
+
+	std::cout << is_empty("Hello") << std::endl;
+	return 0;
+}
diff --git a/6p17.cpp b/6p17.cpp
new file mode 100644
index 0000000..fcebb9c
--- /dev/null
+++ b/6p17.cpp
@@ -0,0 +1,66 @@
+#include <iostream>
+#include <cctype>
+
+/*
+ *
+ * 6.17
+ *
+ *
+ */
+
+bool contains_captial(const std::string &cs) {
+
+	bool cc = false;
+	for(auto a : cs) {
+		if(isupper(a)) {
+			cc = true;
+			break;
+		}
+	}
+
+	return cc;
+}
+
+void tolower_str(std::string &cs) {
+	
+	for(auto &a : cs) {
+		a = tolower(a);
+	}
+}
+
+std::string tolower_str_literals_incl(const std::string &cs) {
+
+	std::string ret = cs;
+	for(auto &a : ret) {
+		a = tolower(a);
+	}
+
+	return ret;
+}
+
+int main () {
+
+	/*
+	  They do need to have different types. With contains_capital we only need to read
+	  the string and tell if it has an uppercase or not.
+
+	  With tolower we actually need to change a string. Or perhaps return a lowercase version.
+	  This does mean that we can't use string literals as arguments. Well... If we use a reference.
+
+	  We don't actually NEED to use a reference if we really wanted to use literals as well.
+	  Because then we need a different approach for the function.
+	  There are several different ways we can define this function really.
+	 */
+	
+	std::cout << contains_captial("hello") << std::endl;
+	std::cout << contains_captial("Hello") << std::endl;
+	std::string aa = "HELLO!!!";
+	std::cout << aa << std::endl;
+	tolower_str(aa);
+	std::cout << aa << std::endl;
+	std::string aa2 = "WOWZA!";
+	std::string aa3 = tolower_str_literals_incl(aa2);
+	std::cout << aa3 << std::endl;
+	std::cout << tolower_str_literals_incl("HIIII!") << std::endl;
+	return 0;
+}
diff --git a/6p18.cpp b/6p18.cpp
new file mode 100644
index 0000000..58d5fbf
--- /dev/null
+++ b/6p18.cpp
@@ -0,0 +1,12 @@
+#include <iostream>
+
+/*
+ *
+ * Description
+ *
+ *
+ */
+
+int main () {
+	return 0;
+}
diff --git a/6p19.cpp b/6p19.cpp
new file mode 100644
index 0000000..58d5fbf
--- /dev/null
+++ b/6p19.cpp
@@ -0,0 +1,12 @@
+#include <iostream>
+
+/*
+ *
+ * Description
+ *
+ *
+ */
+
+int main () {
+	return 0;
+}
diff --git a/6p20.cpp b/6p20.cpp
new file mode 100644
index 0000000..58d5fbf
--- /dev/null
+++ b/6p20.cpp
@@ -0,0 +1,12 @@
+#include <iostream>
+
+/*
+ *
+ * Description
+ *
+ *
+ */
+
+int main () {
+	return 0;
+}