[임베디드 C언어] 메모리 동적 할당 calloc, realloc 사용

hellonayeon · hellonayeon · commit e96aa23d91f9 · 2022-02-20T17:51:16.000+09:00
diff --git a/임베디드 C언어/복습/메모리 동적 할당/calloc_realloc.c b/임베디드 C언어/복습/메모리 동적 할당/calloc_realloc.c
@@ -0,0 +1,46 @@
+/* calloc, realloc 사용해서 매모리 동적 할당 받기 */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+
+int main(void)
+{
+    struct arr {
+        int size;
+        int max_size;
+        int *array;
+    } *lpArray;
+    
+    lpArray = (struct arr*)malloc(sizeof(struct arr));
+    lpArray->size = 0;
+    lpArray->max_size = 5;
+    lpArray->array = (int *)calloc(lpArray->max_size, sizeof(int));
+
+    while (1)
+    {
+        if (lpArray->size >= lpArray->max_size)
+        {
+            printf("array is full!!\n");
+            lpArray->max_size += 5;
+            lpArray->array = (int *)realloc(lpArray->array, lpArray->max_size * sizeof(int));
+        }
+
+        scanf("%d", &lpArray->array[lpArray->size]);
+        if (lpArray->array[lpArray->size] == -1) break;
+        lpArray->size++;
+    }
+
+    int i;
+    for (i=0; i<lpArray->size; i++)
+    {
+        printf("%d\t", lpArray->array[i]);
+    }
+    printf("\n");
+
+    free(lpArray->array);
+    free(lpArray);
+
+    return 0;
+}
