struct practice

qscr/c/gai/fixedynarr.c

@@ -0,0 +1,40 @@
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <time.h>
+struct IntArray{
+  int *data;
+  size_t length;
+};
+
+void readintarray(struct IntArray *input) {
+  printf("inputlength:%zu\n", input->length);
+  for (int i = 0; i < input->length; i++) {
+	printf("digit:%d = %d\n", i, input->data[i]);
+  }
+}
+
+int main() {
+  srand(time(NULL));
+  printf("how many numbers?\n");
+  int length;
+  scanf("%d", &length);
+
+  struct IntArray *myintarray = malloc(sizeof(struct IntArray)); /* allocate memory for struct */
+  int *myarray = malloc(sizeof(int) * length); /* allocate memory for array that the struct points to */
+
+  myintarray->data = myarray; 	/* make sure the pointer in the struct points to the array */
+  myintarray->length = length;  //forgot to actually assign a value to the struct
+  for (int i = 0; i < length; i++) {
+    myintarray->data[i] = rand() % 10;
+    printf("number:%d = %d\n",i,myintarray->data[i]);
+  }
+
+  readintarray(myintarray);
+  
+  free(myintarray->data);
+  free(myintarray);
+  
+  return 0;
+}