如何知道一个字符串是中文还是外文

Question

逐个比较ascii码。
汉字的字节码>125?

Answer 1

(buff[i] & 0x80) != 0就可以了

Answer 2

main()
{
int j;
FILE *fp;
char filename[50],str;
printf("file name!\n");
scanf("%s",&filename);
if((fp=fopen(filename,"rb"))==NULL) {
    printf("Error opening source file!\n");
    return -1;
}
j=0;
do {
    str=fgetc(fp);
   if (!((str>0)&(str<128)))
   j=1;} while(!feof(fp));
printf("j=%d",j);
return 0;
}
若j=1则说明其中有中文，否则则没有

Answer 3

汉字的高位码>0xA0
    while (TempChar = * strin ++)
    {
        if (TempChar == 0x0A)   /* new line */
        {
            if (LastChar != 0)
            {
                *p++ = LastChar;
                LastChar = 0;
            }           *p ++ = TempChar;
        }
        else if (LastChar != 0)  /* a chinese char second byte? */
        {
            OutChar = 0;
            index = (LastChar - 0xA1) * 0x5E + (TempChar - 0xA1);
                /* TempChar: second byte, LastChar: first byte */
            if (index >= 0 && index < GBToBig5TblSize)
                OutChar = GBToBig5Tbl[index];            if (OutChar != 0)
            {
                * p ++ = HIBYTE(OutChar);
                * p ++ = LOBYTE(OutChar);
            }
            else
            {
                * p ++ = HIBYTE(BIGbox);
                * p ++ = LOBYTE(BIGbox);
            }
            LastChar = 0;
        }
        else if (TempChar > 0xA0)
        {
            LastChar = TempChar;
        }
        else
        {
            * p ++ = TempChar;
        }
        /* a new single char, is a chinese first byte ? */
    }