如何判断c程序中的字符数组是否为空？ 用C语言怎么判断一个字符串是否为空？
\u7528C\u8bed\u8a00\u600e\u4e48\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\uff1f\u7a7a\u683c\u4e0d\u7b97\u662f\u7a7a\u5b57\u7b26\u4e32\uff0cstr=""\u8fd9\u6837\u7684\u624d\u7b97\u662f\u7a7a\u5b57\u7b26\u4e32\uff0c\u91cc\u9762\u4ec0\u4e48\u90fd\u6ca1\u6709\uff0c\u800cstr=" "\u662f\u6709\u5185\u5bb9\u4e86\uff0c\u8fd9\u4e2astr\u5b58\u50a8\u4e86\u4e00\u4e2a\u5b57\u7b26(\u7a7a\u683c)\uff0c\u5982\u679c\u4f60\u8981\u628a\u7a7a\u683c\u4e5f\u7b97\u662f\u7a7a\u5b57\u7b26\u4e32\uff0c\u90a3\u4e48\u8981\u7a0d\u4f5c\u4fee\u6539\uff1a
char str[] = " ";
int len = strlen(str), i = 0;
if (len > 0)
{
while(i < len && str[i++] == ' ');
if (i < len) // \u5b57\u7b26\u4e32\u4e0d\u7a7a
else // \u7a7a\u5b57\u7b26\u4e32
}
\u7a7a\u683c\u548c\u5b57\u7b26\u4e32\u4e3a\u7a7a\u7684\u6982\u5ff5\u672c\u6765\u5c31\u4e0d\u4e00\u6837,
\u5982\u697c\u4e0a\u6240\u8bf4\u7a7a\u683c\u672c\u6765\u5c31\u4ee3\u8868\u4e00\u4e2a\u5b57\u7b26,
\u800c\u7a7a\u5b57\u7b26\u4e32\u76f4\u63a5\u4e3a"\0"
\u5982\u679c\u4f60\u8981\u628a\u7a7a\u683c\u7684\u5b57\u7b26\u4e32\u4e5f\u5b9a\u4e49\u4e3a\u7a7a\u5b57\u7b26\u4e32\u7684\u8bdd
\u5c31\u8981\u52a0\u5224\u65ad
\u7a7a\u683c\u7684ASCII\u7801\u4e3a32
\u4f60\u53ea\u9700\u8981\u518d\u591a\u52a0\u4e00\u4e2a\u904d\u5386\u5224\u65ad\u5c31OK
int IsEmpty = 0;
int length = strlen\uff08\u53d8\u91cf);
int n;
//\u904d\u5386\u6574\u4e2a\u5b57\u7b26\u4e32,\u5982\u679c\u5168\u4e3a\u7a7a\u683c,\u5219\u8fd4\u56de\u5b57\u7b26\u4e32\u4e5f\u4e3a\u7a7a
for(n=0;n<length;n++)
{
//\u5224\u65adASCII\u7801\u662f\u5426\u4e3a32
if(\u53d8\u91cf[n]==32)
IsEmpty=1;
else
{
IsEmpty=0;
//\u5b58\u5728\u4e00\u4e2a\u5b57\u7b26\u5219\u8df3\u51fa\u5faa\u73af
break;
}
}
if\uff08length == 0\uff09
printf("\u5b57\u7b26\u4e32\u4e3a\u7a7a");
else if(IsEmpty)
printf("\u5b57\u7b26\u4e32\u4e3a\u7a7a");
else
printf("\u5b57\u7b26\u4e32\u4e0d\u4e3a\u7a7a");
应该改为：
if(strcmp(buff,"")==0)
{
printf("Hi..\t");
}
但由于buff没有清空，所以还是不会进入if
应该这样：
memset(buff,'\0',sizeof(buff));
if(strcmp(buff,"")==0)
{
printf("Hi..\t");
}
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