🦄 refactor(C13, C14, C115): 更新了linux系统开发部分的结构

C13-IO/stdio/fgetc.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+    FILE *fp;
+    int   count;
+
+    if (argc < 2)
+    {
+        fprintf(stderr, "Usage...\n");
+        exit(1);
+    }
+
+    fp = fopen(argv[1], "r");
+    if (NULL == fp)
+    {
+        perror("fopen()");
+        exit(1);
+    }
+
+    while (EOF != fgetc(fp))
+    {
+        count++;
+    }
+
+    printf("count = %d", count);
+
+    fclose(fp);
+
+    exit(0);
+}