这是《Keil Cx51 V7.0单片机高级语言编程与uVision2应用实践》教材各章中列出的全部程序例子。

				#include 
				#include                   /* for printf */
				void tst_strlen (void) {
				   char buf [] = "Find the length of this string";
				   int len;
				   len = strlen (buf);
				   printf ("string length is %d\n", len);
				}