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qscr/c/learnc/aptr.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    int i, j;
+    /* TODO: define the 2D pointer variable here */
+    int ** pnumbers;
+
+    /* TODO: complete the following line to allocate memory for holding three rows */
+    pnumbers = (int **) malloc(sizeof(int)*6);
+
+    /* TODO: allocate memory for storing the individual elements in a row */
+    pnumbers[0] = (int *) malloc(1 * sizeof(int));
+    pnumbers[1] = (int *) malloc(2 * sizeof(int));
+    pnumbers[2] = (int *) malloc(3 * sizeof(int));
+
+    pnumbers[0][0] = 1;
+    pnumbers[1][0] = 1;
+    pnumbers[1][1] = 1;
+    pnumbers[2][0] = 1;
+    pnumbers[2][1] = 2;
+    pnumbers[2][2] = 1;
+
+    for (i = 0; i < 3; i++) {
+        for (j = 0; j <= i; j++) {
+            printf("%d", pnumbers[i][j]);
+        }
+        printf("\n");
+    }
+
+    for (i = 0; i < 3; i++) {
+        /* TODO: free memory allocated for each row */
+        free(pnumbers[i]);
+    }
+
+    /* TODO: free the top-level pointer */
+    free(pnumbers);
+  return 0;
+}