P21跳脫字元

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
  int a,b;
  char c1;

  printf( "Please input two Int. " );
  scanf( "%d %d", &a, &b );    // 100 200[enter]
  printf( "Please input one Char. " );
  scanf( "%c", &c1 );

  printf( "c1=%c, a=%d ,b=%X,  ,b=%o\r\n", c1, a ,b, b );//%o為八進位

  printf( "\101 = A  \x41 = A      0101=%c     0x41=%c\r\n", 0101, 0x41 );
  system( "PAUSE" );
  return 0;
}