diff --git a/c04_string/width.c b/c04_string/width.c
new file mode 100644
index 0000000..af7be68
--- /dev/null
+++ b/c04_string/width.c
@@ -0,0 +1,14 @@
+/* width.c - 字段宽度 */
+#include <stdio.h>
+
+#define PAGES 959
+
+int main(void)
+{
+    printf("*%d*\n", PAGES);
+    printf("*%2d*\n", PAGES);
+    printf("*%10d*\n", PAGES);
+    printf("*%-10d*\n", PAGES);
+
+    return 0;
+}
\ No newline at end of file