ex13

lcthw-remnants-2/.gitignore

@@ -10,3 +10,4 @@ ex9-ec
 ex10
 ex11
 ex12
+ex13

lcthw-remnants-2/ex13.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+  if(argc != 2) {
+    printf("ERROR: You need one argument.\n");
+    // this is how you abort a program
+    return 1;
+  }
+
+  int i = 0;
+  for(i = 0; argv[1][i] != '\0'; i++) {
+    char letter = argv[1][i];
+
+    switch(letter) {
+      case 'a':
+      case 'A':
+        printf("%d: 'A'\n", i);
+        break;
+
+      case 'e':
+      case 'E':
+        printf("%d: 'E'\n", i);
+        break;
+
+      case 'i':
+      case 'I':
+        printf("%d: 'I'\n", i);
+        break;
+
+      case 'o':
+      case 'O':
+        printf("%d: 'O'\n", i);
+        break;
+
+      case 'u':
+      case 'U':
+        printf("%d: 'U'\n", i);
+        break;
+
+      case 'y':
+      case 'Y':
+        if(i > 2) {
+          // it's only sometimes y
+          printf("%d: 'Y'\n", i);
+        }
+        break;
+
+      default:
+        printf("%d: %c is not a vowel\n", i, letter);
+    }
+  }
+
+  return 0;
+}