单选题：给出程序的运行结果‏#includeintmain(){chara，b;ints;printf(“pleaseinputaandbn”);a=getchar();b=getchar();s=a+b;printf(“a=%c，b=%c”，a，b);return;}‏程序运行时从键盘输入‏‏Aa=，b=Ba=，b=Ca=，b=D输出乱码