echo.c

来自「JPEG压缩和解压程序和一些相关的说明文档 内容比较全」· C语言 代码 · 共 17 行

#include "stddef.h"
#include "stdio.h"
main(int argc,char *argv[])
{
  FILE *file;
  int start_position,num,i;
  if ((file=fopen(argv[1],"rb"))==NULL)
    printf("the %scan't  be opened",argv[1]);
  sscanf(argv[2],"%d",&start_position);
  sscanf(argv[3],"%d",&num);
  fseek(file,(long) (start_position-1),0);
  for (i=0;i<num;i++)
    printf("%2x ",fgetc(file));
  fclose(file);
  printf("\n");
}