diff --git a/c04_string/varwid.c b/c04_string/varwid.c
new file mode 100644
index 0000000..6f5d4c2
--- /dev/null
+++ b/c04_string/varwid.c
@@ -0,0 +1,19 @@
+/* varwid.c - 使用变宽输出字段 */
+#include <stdio.h>
+
+int main(void)
+{
+    unsigned width, precision;
+    int number = 256;
+    double weight = 242.5;
+
+    printf("Enter a field width:\n");
+    scanf("%d", &width);
+    printf("The number is :%*d:\n", width, number);
+    printf("Now enter a width and a precision:\n");
+    scanf("%d %d", &width, &precision);
+    printf("Weight = %*.*f\n", width, precision, weight);
+    printf("Done!\n");
+
+    return 0;
+}
\ No newline at end of file