12课test。

12/test.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main() {
+    int a[3][4] = {{1, 2, 3, 4}, {5, 6, 7, 8},{9, 10, 11, 12}};
+    int *p = a[0];
+    int (*q)[4] = a;
+    int i = 0, j = 0;
+    for (i = 0; i < 3; i++) {
+        printf("%p: %d\n", p+i, *(p+i));
+    }
+    printf("-----\n");
+    for (i = 0; i < 12; i++) {
+        printf("%p: %d\n", p+i, *(p+i));
+    }
+    printf("-----\n");
+    for (i = 0; i < 3; i++) {
+        for (j = 0; j < 4; j++) {
+            printf("%p: %d\n", (*(q+i)+j), *(*(q+i)+j));
+        }
+    }
+
+    printf("%ld", sizeof(char));
+    return 0;
+}