如何在程序中打印 Ansii c 扩展代码？

Question

how do i make input or output of highlighted code?

I also use this code.

#include <stdio.h>
 int main()
  {
    int e;
    char ch;

    printf("\n Enter a character : ");
    scanf("%c",&ch);
    e=ch;
    e=e-6;
    ch=e;
    printf("\n This is  % c before the character W :",ch);
    getch();
    return 0;
  }

this code will print Q for input W

Input

Enter a character : W

Output

This is  Q before the character W

Answer 1

Alt-列中的数字意味着您必须读取两个字符：如果第一个字符为零，则您必须读取另一个字符才能获得密钥。