C

learnc/learnc12.c

@@ -1,41 +1,41 @@
-#include <stdio.h>
+#include <stdio.h>
-#include <stdlib.h>
+#include <stdlib.h>
-
+
-int main() {
+int main() { 
-    int i, j;
+    int i, j;
-    /* TODO: define the 2D pointer variable here */
+    /* TODO: define the 2D pointer variable here */
-    int **pnumbers;
+    int **pnumbers;
-
+
-    /* TODO: complete the following line to allocate memory for holding three rows */
+    /* TODO: complete the following line to allocate memory for holding three rows */
-    pnumbers = (int **) malloc(3 *sizeof(int *));
+    pnumbers = (int **) malloc(3 *sizeof(int *));
-
+
-    /* TODO: allocate memory for storing the individual elements in a row */
+    /* TODO: allocate memory for storing the individual elements in a row */
-    pnumbers[0] = (int *) malloc(1 * sizeof(int));
+    pnumbers[0] = (int *) malloc(1 * sizeof(int));
-    pnumbers[1] = (int *) malloc(2 * sizeof(int));
+    pnumbers[1] = (int *) malloc(2 * sizeof(int));
-    pnumbers[2] = (int *) malloc(3 * sizeof(int));
+    pnumbers[2] = (int *) malloc(3 * sizeof(int));
-
+
-
+
-    pnumbers[0][0] = 1;
+    pnumbers[0][0] = 1;
-    pnumbers[1][0] = 1;
+    pnumbers[1][0] = 1;
-    pnumbers[1][1] = 1;
+    pnumbers[1][1] = 1;
-    pnumbers[2][0] = 1;
+    pnumbers[2][0] = 1;
-    pnumbers[2][1] = 2;
+    pnumbers[2][1] = 2;
-    pnumbers[2][2] = 1;
+    pnumbers[2][2] = 1;
-
+
-    for (i = 0; i < 3; i++) {
+    for (i = 0; i < 3; i++) {
-        for (j = 0; j <= i; j++) {
+        for (j = 0; j <= i; j++) {
-            printf("%d", pnumbers[i][j]);
+            printf("%d", pnumbers[i][j]);
-        }
+        }
-        printf("\n");
+        printf("\n");
-    }
+    }
-
+
-    for (i = 0; i < 3; i++) {
+    for (i = 0; i < 3; i++) {
-        /* TODO: free memory allocated for each row */
+        /* TODO: free memory allocated for each row */
-        free(pnumbers[i]);
+        free(pnumbers[i]);
-    }
+    }
-
+
-    /* TODO: free the top-level pointer */
+    /* TODO: free the top-level pointer */
-    free(pnumbers);
+    free(pnumbers);
-
+
-  return 0;
+  return 0;
 }