单项选择题

下面程序的运行结果是 ( )   # include<stdio.h>  # include<string.h>  main( )   { char * a="AbcdEf",* b="aBcD"    a + +;b + +;   printf("%d\n",strcmp(a,b));  }

A.0
B.负数
C.正数
D.无确定值