字符串转为为十六进制

char ConvertHexChar(char ch)
{
  if((ch>='0')&&(ch<='9'))   
  return   ch-0x30;   
  else   if((ch>='A')&&(ch<='F'))   
  return   ch-'A'+10;   
  else   if((ch>='a')&&(ch<='f'))   
  return   ch-'a'+10;   
  else   return   (-1);  

}

char* str = "我们";

char t[20];

sprintf(t, "%X %X %X %X\n", str[0]&0xff,str[1]&0xff,str[2]&0xff,str[3]&0xff);

#include <stdio.h>
#include <string.h>

int main(void){
    char word[17], outword[33];//17:16+1, 33:16*2+1
    int i, len;

    printf("Intro word:");
    fgets(word, sizeof(word), stdin);
    len = strlen(word);
    if(word[len-1]=='\n')
        word[--len] = '\0';

    for(i = 0; i<len; i++){
        sprintf(outword+i*2, "%02X", word[i]);
    }
    printf("%s\n", outword);
    return 0;
}