1 #include <stdio.h> 2 #include <string.h> 3 #include <ctype.h> 4 #define N 16 5 int main(int argc,char *argv[]) 6 { 7   char filename[FILENAME_MAX];//C‘s max length of file name. 8   FILE *Pf=NULL; 9   unsigned char buffer[N]; //Use unsigned char,prevent hex overflow.10   int count,i,j;11     if(argc==1)12     {13       printf("Please tell me your file name(with path if not in the current dir):\n");14       scanf("%s",filename);15     }16     else17     {18     strcpy(filename,argv[1]);19     }20   Pf=fopen(filename,"rb");21     setvbuf(Pf,NULL,_IOFBF,1024);//Set max buffer size to 1024 bytes.22     if(Pf==0)23     {24       printf("Can‘t access %s!\n",filename);25       return 0;26     }27   while(feof(Pf)==0)//check the end of file.28   {29     count=fread(buffer,1,sizeof(buffer),Pf);30         printf("%08x  ",j);//number in hex.31         j+=16;32         for(i=0;i<sizeof(buffer);i++)33     {34             if(i<count)35             {36         printf("%02x ",buffer[i]);37             }38             else39             {40               printf("   ");41             }42     }43     printf("| ");44     for(i=0;i<sizeof(buffer);i++)45     {46             if(i<count)47             {48       printf("%c",isprint(buffer[i])?buffer[i]:‘.‘);49             }50             else51             {52             printf(" ");53             }54     }55     printf("|");56     printf("\n");57   }58   fclose(Pf);59   Pf=NULL;60 }