first commit

1 files changed, 22 insertions, 0 deletions

diff --git a/realloc.c b/realloc.c
new file mode 100644
index 0000000..e0caf86
--- /dev/null
+++ b/realloc.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+  char *mem_allocation;
+
+  // 動的メモリ確保
+  mem_allocation = malloc(20 * sizeof(char));
+  if (mem_allocation == NULL) {
+    fprintf(stderr, "メモリ確保失敗\n");
+    return 1;
+  }
+
+  // 動的メモリ再確保
+  mem_allocation = realloc(mem_allocation, 40 * sizeof(char));
+  if (mem_allocation == NULL) {
+    fprintf(stderr, "メモリ確保失敗\n");
+    return 1;
+  }
+  free(mem_allocation);
+}