[C Tips]善待无符号数

猜猜下面代码的输出是什么？

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->#include<stdio.h>

intarray[]={1,2,3,4,5,6,7,8,9,10};
#defineTOTAL_ELEMENTSsizeof(array)/sizeof(array[0])

intmain(){
intd=-1;
printf("d:%d\n",d);

if(d>TOTAL_ELEMENTS){
printf("d:%dd>TOTAL_ELEMENTS:%d\n",d,TOTAL_ELEMENTS);
}

if(d<(unsignedchar)1){
printf("d:%dd<unsignedchar1\n",d);
}

if(d>(unsignedint)1){
printf("d:%dd>unsignedint1",d);
}

getchar();
}

ANSI C编译器下的结果为：

d:-1
d:-1 d > TOTAL_ELEMENTS:10
d:-1 d < unsigned char 1
d:-1 d > unsigned int 1

知道静悄悄的改变发生在哪儿了么？ ;-)