无法连续获取字符

Question

这只是一个简单的程序，试图获取字符直到输入“ 0”。但是，当我在Code :: Blocks 17.12上执行此操作时，终端似乎总是在打印输入的字符之前得到两个字符作为输入。

char temp;
do  {
     printf("Enter character: ");
     scanf("%c ",&temp);
     printf("Character entered: [%c]\n",temp);
}while(temp!='0');

我得到的结果是

Enter character: a
b
Character entered: [a]
Enter character: c
Character entered: [b]
Enter character: d
Character entered: [c]
Enter character: e
Character entered: [d]
Enter character: 0
Character entered: [e]
Enter character: 0
Character entered: [0]

我的预期结果是

Enter character: a
Character entered: [a]
Enter character: b
Character entered: [b]
Enter character: c
Character entered: [c]
Enter character: c
Character entered: [c]
Enter character: 0
Character entered: [0]

Answer 1

问题是您要求scanf跳过格式字符串中的后缀空格。为了使scanf知道尾随空格在何时何地结束，必须有一些不是空格的输入。

解决方案是跳过格式为" %c"的前导空格。