第五课。

05/Optional01.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+
+void speakOut(int num) {
+    switch (num) {
+        case 0: printf("zero"); break;
+        case 1: printf("one"); break;
+        case 2: printf("two"); break;
+        case 3: printf("three"); break;
+        case 4: printf("four"); break;
+        case 5: printf("five"); break;
+        case 6: printf("six"); break;
+        case 7: printf("seven"); break;
+        case 8: printf("eight"); break;
+        case 9: printf("nine"); break;
+        case 10: printf("ten"); break;
+        case 11: printf("eleven"); break;
+        case 12: printf("twelve"); break;
+        case 13: printf("thirteen"); break;
+        case 14: printf("fourteen"); break;
+        case 15: printf("fifteen"); break;
+        case 16: printf("sixteen"); break;
+        case 17: printf("seventeen"); break;
+        case 18: printf("eighteen"); break;
+        case 19: printf("nineteen"); break;
+        case 20: printf("twenty"); break;
+        case 30: printf("thirty"); break;
+        case 40: printf("forty"); break;
+        case 50: printf("fifty"); break;
+        default: speakOut(num / 10 * 10); printf(" "); speakOut(num % 10);
+    }
+}
+
+int main() {
+    int hr, min;
+    scanf("%d %d" , &hr, &min);
+    speakOut(hr);
+    printf(" ");
+    if (min == 0) {
+        printf("o'clock");
+    }
+    else {
+        speakOut(min);
+    }
+    return 0;
+}