4 files changed, 62 insertions, 0 deletions
diff --git a/wk2/lect/greet.c b/wk2/lect/greet.c
new file mode 100644
index 0000000..ccecd7d
--- /dev/null
+++ b/wk2/lect/greet.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <cs50.h>
+
+//argc is argument count, ie how many arguments were given
+//argv is an array of the arguments given
+//argv[0] is the command that calls the script, ie ./greet
+int main(int argc, string argv[])
+{
+    printf("hello, %s\n", argv[1]);
+}
diff --git a/wk2/lect/lowercase.c b/wk2/lect/lowercase.c
new file mode 100644
index 0000000..ee473ae
--- /dev/null
+++ b/wk2/lect/lowercase.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <cs50.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("Before: ");
+    printf("After: ");
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        printf("%c", tolower(s[i]));
+    }
+    printf("\n");
+}
diff --git a/wk2/lect/status.c b/wk2/lect/status.c
new file mode 100644
index 0000000..ebce04c
--- /dev/null
+++ b/wk2/lect/status.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <cs50.h>
+
+int main(int argc, string argv[])
+{
+    if (argc != 2)
+    {
+        printf("Missing command-line argument\n");
+        return 1;
+    }
+    else
+    {
+        printf("hello, %s\n", argv[1]);
+        return 0;
+    }
+}
diff --git a/wk2/lect/uppercase.c b/wk2/lect/uppercase.c
new file mode 100644
index 0000000..3a34b97
--- /dev/null
+++ b/wk2/lect/uppercase.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <cs50.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("Before: ");
+    printf("After: ");
+    for (int i = 0; i < strlen(s); i++)
+    {
+        if (s[i] >= 'a' && s[i] <= 'z')
+        {
+            printf("%c", s[i] - 32);
+        }
+        else
+        {
+            printf("%c", s[i]);
+        }
+    }
+    printf("\n");
+}