c - 程序求助!用户点击后进入程序结束

Question

好的，我正在编写一个程序，从用户那里读取两个字符，然后打印这两个字符之间的 ASCII 字母。问题是程序运行时会提示用户输入第一个字符，一旦用户点击回车，程序就会结束。我错过了什么？

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]){


      char firstchar;
      char secondchar;
      int variable;
      int highest;
      int lowest;
      char ASCIvariable;

      printf("Please enter a character. ");
      scanf("%d", &firstchar);

      printf("Please enter another character. ");
      scanf("%d", &secondchar);

      if(firstchar < secondchar) 
      {
         secondchar = highest;
         firstchar = lowest;
      }else{
         firstchar = highest;
         secondchar = lowest;
      }

      variable = lowest;

      for ( variable != highest; variable < highest; variable++ )
      {
          variable = ASCIvariable;
          printf(ASCIvariable);
      }

      return 0;
}

我显然也不明白如何在此站点上发布代码。我需要在每一行代码之前手动输入四个空格吗？

---

这里更新的是当前代码也控制 k 将不允许粘贴....

#include <stdio.h>
#include <stdlib.h>



 int main(int argc, char *argv[]) {


    char firstchar;
  char secondchar;
   int variable;
  int highest;
  int lowest;
  char ASCIvariable;

  printf("Please enter a character. ");
  scanf(" %c", &firstchar);

  printf("Please enter another character. ");
  scanf(" %c", &secondchar);

  if(firstchar < secondchar) 
  {
 highest = secondchar;
 lowest = firstchar;
}
  else
  {
  highest = firstchar;
  lowest = secondchar;
}

  variable = lowest;


 for (variable != highest; variable <= highest; variable++ )
  {
        ASCIvariable = variable;
      printf("%c ", ASCIvariable);

  }


    return 0;
}

它成功地让用户输入了两个字符，然后打印了两个字符之间的字母。我认为这是正确的？

Answer 1

使用错误的格式说明符可能会导致 UB。你需要扫描一个字符

scanf("%c", &firstchar);

然后使用

刷新换行符

scanf(" %c",&secondchar);

%c 之前的空格占用换行符。